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Vladimir Cech
Institute of Materials Chemistry, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200, Brno, Czech Republic

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Journal article
Published: 07 August 2021 in Materials Chemistry and Physics
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With the aim of optimizing the interfacial adhesion of basalt fibres with thermoset matrices, in this research the plasma polymerization technique (PECVD) was used to synthesize polymeric coatings based on tetravinylsilane (TVS) or its mixtures with oxygen on the surface of basalt fibres. The successful deposition of the polymer sizing was confirmed by XPS analysis, which highlighted the increase in the intensity of the carbon and oxygen peaks. To evaluate the influence of polymer sizing on interfacial adhesion, basalt fibre/polyester resin composites were tested through the short beam shear (SBS) test. Compared to neat basalt fibres, the modified fibres showed a significant increase in the interlaminar shear strength (ILSS) higher than 180%. These results compared quite favourably with those on glass fibres used as baseline, with higher ILSS values as a function of oxygen content. The improvement in interfacial adhesion was correlated with the increase in basalt fibre surface energy by single fibre dynamic contact angle tests.

ACS Style

Matteo Lilli; Michal Jurko; Veronika Sirjovova; Milan Zvonek; Vladimir Cech; Christina Scheffler; Celia Rogero; Maxim Ilyn; Jacopo Tirillò; Fabrizio Sarasini. Basalt fibre surface modification via plasma polymerization of tetravinylsilane/oxygen mixtures for improved interfacial adhesion with unsaturated polyester matrix. Materials Chemistry and Physics 2021, 274, 125106 .

AMA Style

Matteo Lilli, Michal Jurko, Veronika Sirjovova, Milan Zvonek, Vladimir Cech, Christina Scheffler, Celia Rogero, Maxim Ilyn, Jacopo Tirillò, Fabrizio Sarasini. Basalt fibre surface modification via plasma polymerization of tetravinylsilane/oxygen mixtures for improved interfacial adhesion with unsaturated polyester matrix. Materials Chemistry and Physics. 2021; 274 ():125106.

Chicago/Turabian Style

Matteo Lilli; Michal Jurko; Veronika Sirjovova; Milan Zvonek; Vladimir Cech; Christina Scheffler; Celia Rogero; Maxim Ilyn; Jacopo Tirillò; Fabrizio Sarasini. 2021. "Basalt fibre surface modification via plasma polymerization of tetravinylsilane/oxygen mixtures for improved interfacial adhesion with unsaturated polyester matrix." Materials Chemistry and Physics 274, no. : 125106.

Short communication
Published: 23 April 2021 in Composites Communications
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The interface of fibre reinforced composite materials is deeply affected by the type of sizing applied to the surface of the fibres. In this study, a polymer film based on pure tetravinylsilane (TVS) or its mixture with two different oxygen amounts was deposited on the surface of unsized basalt fibres by plasma enhanced chemical vapour deposition. At first, the influence of the plasma process was investigated through a single fibre tensile test characterization, which did not show any strength degradation of the modified fibres. Subsequently, single fibre pull-out tests were performed to study interfacial strength with an epoxy matrix. The presence of oxygen within the polymer film mixture allowed to increase the interfacial shear strength (IFSS) by 79% compared to untreated basalt fibres, highlighting an excellent fibre/matrix interface for the micro composite. After the interfacial adhesion tests, scanning electron microscopy confirmed the strong bond between the fibre surface and the deposited silane sizing.

ACS Style

Matteo Lilli; Milan Zvonek; Vladimir Cech; Christina Scheffler; Jacopo Tirillò; Fabrizio Sarasini. Low temperature plasma polymerization: An effective process to enhance the basalt fibre/matrix interfacial adhesion. Composites Communications 2021, 27, 100769 .

AMA Style

Matteo Lilli, Milan Zvonek, Vladimir Cech, Christina Scheffler, Jacopo Tirillò, Fabrizio Sarasini. Low temperature plasma polymerization: An effective process to enhance the basalt fibre/matrix interfacial adhesion. Composites Communications. 2021; 27 ():100769.

Chicago/Turabian Style

Matteo Lilli; Milan Zvonek; Vladimir Cech; Christina Scheffler; Jacopo Tirillò; Fabrizio Sarasini. 2021. "Low temperature plasma polymerization: An effective process to enhance the basalt fibre/matrix interfacial adhesion." Composites Communications 27, no. : 100769.

Journal article
Published: 16 February 2021 in Polymers
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High-performance fibre-reinforced polymer composites are important construction materials based not only on the specific properties of the reinforcing fibres and the flexible polymer matrix but also on the compatible properties of the composite interphase. First, oxygen-free (a-CSi:H) and oxygen-binding (a-CSiO:H) plasma nanocoatings of different mechanical and tribological properties were deposited on planar silicon dioxide substrates that closely mimic E-glass. The nanoscratch test was used to characterize the nanocoating adhesion expressed in terms of critical normal load and work of adhesion. Next, the same nanocoatings were deposited on E-glass fibres, which were used as reinforcements in the polyester composite to affect its interphase properties. The shear properties of the polymer composite were characterized by macro- and micromechanical tests, namely a short beam shear test to determine the short-beam strength and a single fibre push-out test to determine the interfacial shear strength. The results of the polymer composites showed a strong correlation between the short-beam strength and the interfacial shear strength, proving that both tests are sensitive to changes in fibre-matrix adhesion due to different surface modifications of glass fibres (GF). Finally, a strong correlation between the shear properties of the GF/polyester composite and the adhesion of the plasma nanocoating expressed through the work of adhesion was demonstrated. Thus, increasing the work of adhesion of plasma nanocoatings from 0.8 to 1.5 mJ·m−2 increased the short-beam strength from 23.1 to 45.2 MPa. The results confirmed that the work of adhesion is a more suitable parameter in characterising the level of nanocoating adhesion in comparison with the critical normal load.

ACS Style

Tomas Plichta; Veronika Sirjovova; Milan Zvonek; Gerhard Kalinka; Vladimir Cech. The Adhesion of Plasma Nanocoatings Controls the Shear Properties of GF/Polyester Composite. Polymers 2021, 13, 593 .

AMA Style

Tomas Plichta, Veronika Sirjovova, Milan Zvonek, Gerhard Kalinka, Vladimir Cech. The Adhesion of Plasma Nanocoatings Controls the Shear Properties of GF/Polyester Composite. Polymers. 2021; 13 (4):593.

Chicago/Turabian Style

Tomas Plichta; Veronika Sirjovova; Milan Zvonek; Gerhard Kalinka; Vladimir Cech. 2021. "The Adhesion of Plasma Nanocoatings Controls the Shear Properties of GF/Polyester Composite." Polymers 13, no. 4: 593.

Journal article
Published: 21 May 2020 in Materials Today Communications
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Organosilicon nanocoatings are key materials that are part of many mechanical, optical, electronic, and medical devices and are essential to optimize the surface properties of any type of material with respect to the application. Because of such a wide range of applications, the chemical and physical properties of coatings need to be controlled within wide ranges, which is difficult to achieve by a single coating process. Plasma nanotechnology, based on controlled dissociation and consumption of the precursor molecule, is presented as the appropriate technique for the synthesis of well-defined materials with controllable properties. Tetravinylsilane is selected as the precursor molecule to demonstrate the range of coating properties achieved, from a polymer-like to a tough material with a gradually varying organic-inorganic character. The removal of hydrogen from the carbon-silicon network of the coating is responsible for its increased crosslinking that controls both the mechanical and optical properties of the coating. A more crosslinked coating contains a lower concentration of vinyl groups but a higher sp2 bond fraction, resulting in a drop of the band gap from 2.6 to 1.0 eV. It is shown that plasma nanotechnology allows the construction of more complex nanostructures with high reproducibility.

ACS Style

Martin Branecky; Naghmeh Aboualigaledari; Vladimir Cech. Plasma Nanotechnology for Controlling Chemical and Physical Properties of Organosilicon Nanocoatings. Materials Today Communications 2020, 24, 101234 .

AMA Style

Martin Branecky, Naghmeh Aboualigaledari, Vladimir Cech. Plasma Nanotechnology for Controlling Chemical and Physical Properties of Organosilicon Nanocoatings. Materials Today Communications. 2020; 24 ():101234.

Chicago/Turabian Style

Martin Branecky; Naghmeh Aboualigaledari; Vladimir Cech. 2020. "Plasma Nanotechnology for Controlling Chemical and Physical Properties of Organosilicon Nanocoatings." Materials Today Communications 24, no. : 101234.

Journal article
Published: 17 January 2020 in Surface and Coatings Technology
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Mechanical properties of thin films and, in particular, adhesion are crucial engineering parameters which must be determined to allow their successful application both in the industry and science. Deposited hydrogenated amorphous carbon-silicon (a-CSi:H) films prepared by plasma-enhanced chemical vapour deposition (PECVD) were tested using a nanoscratch test. The load at which adhesion failure occurs is known as the critical normal load and is used as a semi-quantitative measure of adhesion. However, results in this article suggest that the critical normal load is not an appropriate measure of adhesion for these materials, and instead, the work of adhesion should rather be considered as an alternative method. This is due to the considerable variation of Young's modulus, which affects the critical load figures, while the friction coefficient and film thickness also do not have negligible influence. Moreover, the critical load is considerably influenced by intrinsic and extrinsic parameters. Furthermore, it has been found that the critical load increased with increasing a-CSi:H film thickness, but this did not apply to the work of adhesion. On the contrary, it remained constant unless a change of film failure mode occurred. Adhesion was monitored for 5 years to determine the effect of aging and the results were found to be practically identical over this duration which indicates high film stability.

ACS Style

Tomas Plichta; Martin Branecky; Vladimir Cech. Characterization of a-CSi:H films prepared by PECVD in terms of adhesion. Surface and Coatings Technology 2020, 385, 125375 .

AMA Style

Tomas Plichta, Martin Branecky, Vladimir Cech. Characterization of a-CSi:H films prepared by PECVD in terms of adhesion. Surface and Coatings Technology. 2020; 385 ():125375.

Chicago/Turabian Style

Tomas Plichta; Martin Branecky; Vladimir Cech. 2020. "Characterization of a-CSi:H films prepared by PECVD in terms of adhesion." Surface and Coatings Technology 385, no. : 125375.

Journal article
Published: 01 November 2019 in Journal of Vacuum Science & Technology B
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The optical properties of a slightly boron doped float-zone crystalline silicon wafer are studied using ellipsometry and spectrophotometry in a wide spectral range from far IR to vacuum UV. One side of the wafer was cleaned in an argon plasma, which influenced the optical properties of silicon near the surface. The dielectric response of silicon was modeled using a simplified universal dispersion model which is constructed on the basis of parameterization of the joint density of states describing both the electronic and phonon excitations. Several variants of models describing phonon absorption and interband transitions are discussed. It was possible to accurately determine the optical constants of bulk silicon and the optical constants near the perturbed surface over a wide spectral range. These optical constants agree well with those found in other works. From the optical measurements, it was also possible to determine the thickness of the wafer and the static value of resistivity, and the determined values agreed with nominal values specified for the wafer.The optical properties of a slightly boron doped float-zone crystalline silicon wafer are studied using ellipsometry and spectrophotometry in a wide spectral range from far IR to vacuum UV. One side of the wafer was cleaned in an argon plasma, which influenced the optical properties of silicon near the surface. The dielectric response of silicon was modeled using a simplified universal dispersion model which is constructed on the basis of parameterization of the joint density of states describing both the electronic and phonon excitations. Several variants of models describing phonon absorption and interband transitions are discussed. It was possible to accurately determine the optical constants of bulk silicon and the optical constants near the perturbed surface over a wide spectral range. These optical constants agree well with those found in other works. From the optical measurements, it was also possible to determine the thickness of the wafer and the static value of resistivity, and the determined va...

ACS Style

Daniel Franta; Jiří Vohánka; Martin Bránecký; Pavel Franta; Martin Čermák; Ivan Ohlídal; Vladimir Cech. Optical properties of the crystalline silicon wafers described using the universal dispersion model. Journal of Vacuum Science & Technology B 2019, 37, 062907 .

AMA Style

Daniel Franta, Jiří Vohánka, Martin Bránecký, Pavel Franta, Martin Čermák, Ivan Ohlídal, Vladimir Cech. Optical properties of the crystalline silicon wafers described using the universal dispersion model. Journal of Vacuum Science & Technology B. 2019; 37 (6):062907.

Chicago/Turabian Style

Daniel Franta; Jiří Vohánka; Martin Bránecký; Pavel Franta; Martin Čermák; Ivan Ohlídal; Vladimir Cech. 2019. "Optical properties of the crystalline silicon wafers described using the universal dispersion model." Journal of Vacuum Science & Technology B 37, no. 6: 062907.

Original research
Published: 16 October 2019 in Cellulose
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This work is focused on the assessment of the effect of oxygen and polymer plasma tetravinylsilane (pp-TVS) treatments on the adhesion of flax yarns with epoxy and vinylester thermoset matrices. These low temperature plasma processes have been selected as more environmentally friendly alternatives to traditional chemical treatments. Tensile tests performed on single flax yarns revealed a reduction in their mechanical properties after plasma treatments. In particular, a tensile strength reduction of 36.4% was detected after the oxygen plasma treatment using 100 W of plasma power. The morphological analysis highlighted that this result is mainly ascribed to the ablation action produced by oxygen plasma process. In the case of pp-TVS, both morphological and Fourier transform infrared spectroscopy analysis confirmed the presence of a homogeneous tetravinylsilane film on the surface of the yarns. The interfacial adhesion of untreated, oxygen plasma treated, and plasma-polymer coated flax yarns has been determined by single fibre fragmentation test. The plasma polymer deposition can produce a significant improvement of the adhesion property of flax yarns with both epoxy and vinylester matrices. An increase of the interfacial shear strength values of 114% and 71% was found after the TVS film deposition in epoxy and vinylester composites, respectively. These results were confirmed by high-resolution micro-CT, photoelasticity analysis and FE-SEM observations.

ACS Style

Maria Carolina Seghini; Fabienne Touchard; Fabrizio Sarasini; Laurence Chocinski-Arnault; Jacopo Tirillò; Maria Paola Bracciale; Milan Zvonek; Vladimir Cech. Effects of oxygen and tetravinylsilane plasma treatments on mechanical and interfacial properties of flax yarns in thermoset matrix composites. Cellulose 2019, 27, 511 -530.

AMA Style

Maria Carolina Seghini, Fabienne Touchard, Fabrizio Sarasini, Laurence Chocinski-Arnault, Jacopo Tirillò, Maria Paola Bracciale, Milan Zvonek, Vladimir Cech. Effects of oxygen and tetravinylsilane plasma treatments on mechanical and interfacial properties of flax yarns in thermoset matrix composites. Cellulose. 2019; 27 (1):511-530.

Chicago/Turabian Style

Maria Carolina Seghini; Fabienne Touchard; Fabrizio Sarasini; Laurence Chocinski-Arnault; Jacopo Tirillò; Maria Paola Bracciale; Milan Zvonek; Vladimir Cech. 2019. "Effects of oxygen and tetravinylsilane plasma treatments on mechanical and interfacial properties of flax yarns in thermoset matrix composites." Cellulose 27, no. 1: 511-530.

Journal article
Published: 15 July 2019 in Polymers
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All reinforcements for polymer-matrix composites must be coated with a suitable material in the form of a thin film to improve compatibility and interfacial adhesion between the reinforcement and the polymer matrix. In this study, plasma nanotechnology was used to synthetize such functional nanocoatings using pure tetravinylsilane (TVS) and its mixtures with oxygen gas (O2) as precursors. The plasma-coated glass fibers (GFs) were unidirectionally embedded in a polyester resin to produce short composite beams that were analyzed by a short-beam-shear test to determine the shear strength characterizing the functionality of the nanocoatings in a GF/polyester composite. The developed plasma nanocoatings allowed controlling the shear strength between 26.2–44.1 MPa depending on deposition conditions, i.e., the radiofrequency (RF) power and the oxygen fraction in the TVS/O2 mixture. This range of shear strength appears to be sufficiently broad to be used in the design of composites.

ACS Style

Milan Zvonek; Veronika Sirjovova; Martin Branecky; Tomas Plichta; Josef Skacel; Vladimir Cech; Cech. Plasma Nanocoatings Developed to Control the Shear Strength of Polymer Composites. Polymers 2019, 11, 1188 .

AMA Style

Milan Zvonek, Veronika Sirjovova, Martin Branecky, Tomas Plichta, Josef Skacel, Vladimir Cech, Cech. Plasma Nanocoatings Developed to Control the Shear Strength of Polymer Composites. Polymers. 2019; 11 (7):1188.

Chicago/Turabian Style

Milan Zvonek; Veronika Sirjovova; Martin Branecky; Tomas Plichta; Josef Skacel; Vladimir Cech; Cech. 2019. "Plasma Nanocoatings Developed to Control the Shear Strength of Polymer Composites." Polymers 11, no. 7: 1188.

Journal article
Published: 19 April 2019 in Composites Part A: Applied Science and Manufacturing
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In an attempt to improve mechanical properties of basalt fibre/epoxy composites, the present work provides a comparison between the effects of a commercial coupling agent, a thermal de-sizing treatment and a plasma polymerization process on the fibre/matrix interfacial strength. The different basalt fibres were characterized in terms of surface morphology, by FE-SEM observations, and chemical composition, performing FT-IR analysis. The interfacial adhesion has been investigated by single fibre fragmentation test on single filament composite samples. The plasma polymerization process was able to produce a homogeneous tetravinylsilane (pp-TVS) coating on the surface of basalt fibres, which resulted in a significant increase in the fibre/matrix adhesion. The surface roughness of the untreated and treated basalt fibres has been measured by AFM and a relationship between the surface roughness and the fibre/matrix adhesion quality was found. High-resolution microtomography (µ-CT) has been used to support the analysis of the damage modes during fragmentation tests.

ACS Style

M.C. Seghini; F. Touchard; F. Sarasini; Vladimir Cech; L. Chocinski-Arnault; D. Mellier; J. Tirillò; M.P. Bracciale; M. Zvonek. Engineering the interfacial adhesion in basalt/epoxy composites by plasma polymerization. Composites Part A: Applied Science and Manufacturing 2019, 122, 67 -76.

AMA Style

M.C. Seghini, F. Touchard, F. Sarasini, Vladimir Cech, L. Chocinski-Arnault, D. Mellier, J. Tirillò, M.P. Bracciale, M. Zvonek. Engineering the interfacial adhesion in basalt/epoxy composites by plasma polymerization. Composites Part A: Applied Science and Manufacturing. 2019; 122 ():67-76.

Chicago/Turabian Style

M.C. Seghini; F. Touchard; F. Sarasini; Vladimir Cech; L. Chocinski-Arnault; D. Mellier; J. Tirillò; M.P. Bracciale; M. Zvonek. 2019. "Engineering the interfacial adhesion in basalt/epoxy composites by plasma polymerization." Composites Part A: Applied Science and Manufacturing 122, no. : 67-76.

Journal article
Published: 26 March 2019 in Composites Part A: Applied Science and Manufacturing
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Plasma-enhanced chemical vapor deposition (PECVD) is a cost-effective and green process of plasma polymer synthesis that can be used as a gentle but powerful tool for the surface modification of fibers and retains their bulk properties. This paper introduces the notion of a compact and modular device consisting of low-pressure reactor segments that have a specialized function and are adapted for the continuous modification of fiber surface. A roll-to-roll device, designed on an industrial scale, with a PECVD reactor was used for continuous plasma pretreatment and plasma polymerization coating on 1600 glass fibers in a bundle, with the fibers used as reinforcements in a glass fiber/polyester composite. Optimization of the plasma-processing conditions allowed for the improvement of interfacial adhesion between the glass fibers and polymer matrix, resulting in an increase in the shear strength of the polymer composite by 14%, compared to industrially sized fibers coated by wet chemical processes.

ACS Style

Vladimir Cech; Ales Marek; Antonin Knob; Jan Valter; Martin Branecky; Petr Plihal; Jiri Vyskocil. Continuous surface modification of glass fibers in a roll-to-roll plasma-enhanced CVD reactor for glass fiber/polyester composites. Composites Part A: Applied Science and Manufacturing 2019, 121, 244 -253.

AMA Style

Vladimir Cech, Ales Marek, Antonin Knob, Jan Valter, Martin Branecky, Petr Plihal, Jiri Vyskocil. Continuous surface modification of glass fibers in a roll-to-roll plasma-enhanced CVD reactor for glass fiber/polyester composites. Composites Part A: Applied Science and Manufacturing. 2019; 121 ():244-253.

Chicago/Turabian Style

Vladimir Cech; Ales Marek; Antonin Knob; Jan Valter; Martin Branecky; Petr Plihal; Jiri Vyskocil. 2019. "Continuous surface modification of glass fibers in a roll-to-roll plasma-enhanced CVD reactor for glass fiber/polyester composites." Composites Part A: Applied Science and Manufacturing 121, no. : 244-253.

Journal article
Published: 12 February 2019 in Materials
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Pure tetravinylsilane and its oxygen mixture were used to deposit oxidized plasma polymer films at various effective power (0.1–10 W) and various oxygen fractions (0–0.71) using RF pulsed plasma. The optical properties (refractive index, extinction coefficient, band gap) of the deposited films were investigated by spectroscopic ellipsometry (230–830 nm) using an optical model and Tauc‒Lorentz parametrization. Analyses of chemical and mechanical properties of films allowed for the interpretation of changes in optical properties with deposition conditions. The refractive index was revealed to increase with enhanced effective power due to the increased crosslinking of the plasma polymer network but decreased when increasing the oxygen fraction due to the decrease of polymer crosslinking as the number of carbon bonds in the plasma polymer network was eliminated. A very strong positive correlation was found between the Young’s modulus and the refractive index for oxidized plasma polymer films. The optical properties of films correlated with their chemical properties for the specific deposition conditions used in this study. The band gap (1.9–2.9 eV) was assumed to be widened due to the increased concentration of vinyl groups in oxidized plasma polymer films.

ACS Style

Bozena Cechalova; Martin Branecky; Petr Klapetek; Vladimir Cech. Optical Properties of Oxidized Plasma-Polymerized Organosilicones and Their Correlation with Mechanical and Chemical Parameters. Materials 2019, 12, 539 .

AMA Style

Bozena Cechalova, Martin Branecky, Petr Klapetek, Vladimir Cech. Optical Properties of Oxidized Plasma-Polymerized Organosilicones and Their Correlation with Mechanical and Chemical Parameters. Materials. 2019; 12 (3):539.

Chicago/Turabian Style

Bozena Cechalova; Martin Branecky; Petr Klapetek; Vladimir Cech. 2019. "Optical Properties of Oxidized Plasma-Polymerized Organosilicones and Their Correlation with Mechanical and Chemical Parameters." Materials 12, no. 3: 539.

Journal article
Published: 01 October 2018 in Applied Surface Science
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Layered nanocomposites with a controlled distribution of mechanical properties across the nanostructure were constructed from oxygen-free (a-CSi:H) and oxygen-bound (a-CSiO:H) individual layers. These were deposited at different power or pulse periods from pure tetravinylsilane and tetravinylsilane in a mixture with oxygen gas using plasma-enhanced chemical vapor deposition operating in pulse mode. XPS depth profiling using argon gas cluster ion beams was used to determine the atomic concentration of carbon, silicon, and oxygen in the individual layers forming the nanocomposite. These layers had a total thickness of about 100 nm. The XPS analysis revealed that the oxygen-free layers were oxidized due to post-deposition oxidation in the ambient air. Oxygen was even diffused in an oxygen-bound layer, which was confirmed by repeated XPS depth profiling within three months after nanocomposite deposition. The upper oxygen-bound layer at the nanocomposite surface behaved as a barrier and reduced oxygen diffusion. The high energy-resolution XPS spectra (C 1s, Si 2p, and O 1s) were analyzed to gain more insight into bonding species formed in layered nanocomposite. This detailed analysis showed that oxygen atoms originating from the ambient air were bound in the oxidized a-CSi:H layers and formed the same bonding states as those in the as-deposited oxygen-bound layers.

ACS Style

Jana Houdková; Martin Branecky; Tomas Plichta; Petr Jiricek; Josef Zemek; Vladimir Cech. Chemical depth profile of layered a-CSiO:H nanocomposites. Applied Surface Science 2018, 456, 941 -950.

AMA Style

Jana Houdková, Martin Branecky, Tomas Plichta, Petr Jiricek, Josef Zemek, Vladimir Cech. Chemical depth profile of layered a-CSiO:H nanocomposites. Applied Surface Science. 2018; 456 ():941-950.

Chicago/Turabian Style

Jana Houdková; Martin Branecky; Tomas Plichta; Petr Jiricek; Josef Zemek; Vladimir Cech. 2018. "Chemical depth profile of layered a-CSiO:H nanocomposites." Applied Surface Science 456, no. : 941-950.

Journal article
Published: 16 August 2018 in Fibers
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Compatible interlayers must be coated on reinforcing fibers to ensure effective stress transfer from the polymer matrix to the fiber in high-performance polymer composites. The mechanical properties of the interlayer, and its interfacial adhesion on both interfaces with the fiber and polymer matrix are among the key parameters that control the performance of polymer composite through the interphase region. Plasma-synthesized interlayers, in the form of variable materials from polymer-like to glass-like films with a Young’s modulus of 10–52 GPa, were deposited on unsized glass fibers used as reinforcements in glass fiber/polyester composites. Modulus Mapping (dynamic nanoindentation testing) was successfully used to examine the mechanical properties across the interphase region on cross-sections of the model composite in order to distinguish the fiber, the interlayer, and the modified and bulk polymer matrix. The interfacial shear strength for plasma-coated fibers in glass fiber/polyester composites, determined from the microindentation test, was up to 36% higher than those of commercially sized fibers. The effects of fiber pretreatment, single and double interlayers, and post-treatment of the interlayer on interfacial shear strength were also discussed. Functional interlayers with high shear yield strength and controlled physicochemical properties are promising for high-performance polymer composites with a controlled interphase.

ACS Style

Antonin Knob; Jaroslav Lukes; Lawrence Thadeus Drzal; Vladimir Cech. Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites. Fibers 2018, 6, 58 .

AMA Style

Antonin Knob, Jaroslav Lukes, Lawrence Thadeus Drzal, Vladimir Cech. Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites. Fibers. 2018; 6 (3):58.

Chicago/Turabian Style

Antonin Knob; Jaroslav Lukes; Lawrence Thadeus Drzal; Vladimir Cech. 2018. "Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites." Fibers 6, no. 3: 58.

Journal article
Published: 01 June 2018 in Progress in Organic Coatings
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ACS Style

Dawn Bussey; Vratislav Perina; Frank R. Jones; Vladimir Cech. Effect of chemical modification on the mechanical properties of plasma-polymerized organosilicones. Progress in Organic Coatings 2018, 119, 85 -90.

AMA Style

Dawn Bussey, Vratislav Perina, Frank R. Jones, Vladimir Cech. Effect of chemical modification on the mechanical properties of plasma-polymerized organosilicones. Progress in Organic Coatings. 2018; 119 ():85-90.

Chicago/Turabian Style

Dawn Bussey; Vratislav Perina; Frank R. Jones; Vladimir Cech. 2018. "Effect of chemical modification on the mechanical properties of plasma-polymerized organosilicones." Progress in Organic Coatings 119, no. : 85-90.

Journal article
Published: 24 April 2018 in Thin Solid Films
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The plasma coating of glass fibers is an alternative technology to the wet chemical processes employed for the commercial sizing used for glass-fiber-reinforced polymer composites. A polymer-like film prepared by plasma polymerization can be used as a compatible interlayer between the glass fiber and the polymer matrix. The shear stress distribution across the interphase in a fiber-reinforced polymer composite indicates that the interfacial adhesion at the interlayer/fiber interface is the key factor influencing the performance of the polymer composite. The plasma-polymerized tetravinylsilane deposited at an enhanced effective power was tested as an adhesion film on planar glass substrate using a nanoscratch test. The work of adhesion was used as a measure of film adhesion based on the analysis of the scratch mechanics. An enhanced effective power (0.1–10 W) resulted in a film adhesion change only in the region of 30% for plasma-polymerized tetravinylsilane. The addition of oxygen gas to the tetravinylsilane monomer enabled the depositing of films over a wide range of film adhesions. A 3.7-fold increase in film adhesion was revealed for optimized deposition conditions. For a given film, a strong correlation was found between the shear strength of the polymer composite with glass fibers coated by plasma polymer film and the corresponding film adhesion on planar glass substrate determined using the nanoscratch test.

ACS Style

Erik Palesch; Antonin Knob; Tomas Plichta; Vladimir Cech. Functional interlayers with controlled adhesion developed for polymer composites. Thin Solid Films 2018, 656, 37 -43.

AMA Style

Erik Palesch, Antonin Knob, Tomas Plichta, Vladimir Cech. Functional interlayers with controlled adhesion developed for polymer composites. Thin Solid Films. 2018; 656 ():37-43.

Chicago/Turabian Style

Erik Palesch; Antonin Knob; Tomas Plichta; Vladimir Cech. 2018. "Functional interlayers with controlled adhesion developed for polymer composites." Thin Solid Films 656, no. : 37-43.

Article
Published: 05 September 2017 in Polymer Composites
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Plasma-polymerized films (interlayers) of tetravinylsilane in mixture with oxygen gas (oxygen fraction 0-0.71) were coated on glass fibers (GF) used as reinforcements in GF/polyester composite. Oxygen atoms of increased concentration (0-18 at.%) were partly incorporated into the plasma polymer network, forming SiOC/COC bonding species and partly forming side polar (hydroxyl, carbonyl) groups with enhanced oxygen fraction. The amount of oxygen in plasma coatings influenced the Young's modulus, interfacial adhesion, and surface free energy of the interlayer. To determine the interfacial shear strength, a microindentation test was implemented for individual glass fibers on a cross-section of GF/polyester composite. The interfacial shear strength for oxidized plasma coatings was up to 21% higher than that for the non-oxidized interlayer, indicating a direct chemical effect of oxygen atoms on interphase properties. The interphase shear failure was controlled by the shear strength at the interlayer/fiber interface as follows from experimental and model data. POLYM. COMPOS., 2017. © 2017 Society of Plastics Engineers

ACS Style

V. Cech; A. Knob; T. Lasota; J. Lukes; L.T. Drzal. Surface modification of glass fibers by oxidized plasma coatings to improve interfacial shear strength in GF/polyester composites. Polymer Composites 2017, 40, 1 .

AMA Style

V. Cech, A. Knob, T. Lasota, J. Lukes, L.T. Drzal. Surface modification of glass fibers by oxidized plasma coatings to improve interfacial shear strength in GF/polyester composites. Polymer Composites. 2017; 40 (S1):1.

Chicago/Turabian Style

V. Cech; A. Knob; T. Lasota; J. Lukes; L.T. Drzal. 2017. "Surface modification of glass fibers by oxidized plasma coatings to improve interfacial shear strength in GF/polyester composites." Polymer Composites 40, no. S1: 1.

Journal article
Published: 01 August 2017 in Thin Solid Films
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ACS Style

Erik Palesch; Vladimir Cech. Characterization of interlayer adhesion on single glass fibers and planar glass using the nanoscratch test technique. Thin Solid Films 2017, 636, 353 -358.

AMA Style

Erik Palesch, Vladimir Cech. Characterization of interlayer adhesion on single glass fibers and planar glass using the nanoscratch test technique. Thin Solid Films. 2017; 636 ():353-358.

Chicago/Turabian Style

Erik Palesch; Vladimir Cech. 2017. "Characterization of interlayer adhesion on single glass fibers and planar glass using the nanoscratch test technique." Thin Solid Films 636, no. : 353-358.

Journal article
Published: 01 March 2017 in Materials Chemistry and Physics
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ACS Style

Yi-Syuan Wei; Wan-Yu Liu; Hsin-Ming Wu; Ko-Shao Chen; Vladimir Cech. Characteristics of SiOx-containing hard film prepared by low temperature plasma enhanced chemical vapor deposition using hexamethyldisilazane or vinyltrimethylsilane and post oxygen plasma treatment. Materials Chemistry and Physics 2017, 189, 183 -190.

AMA Style

Yi-Syuan Wei, Wan-Yu Liu, Hsin-Ming Wu, Ko-Shao Chen, Vladimir Cech. Characteristics of SiOx-containing hard film prepared by low temperature plasma enhanced chemical vapor deposition using hexamethyldisilazane or vinyltrimethylsilane and post oxygen plasma treatment. Materials Chemistry and Physics. 2017; 189 ():183-190.

Chicago/Turabian Style

Yi-Syuan Wei; Wan-Yu Liu; Hsin-Ming Wu; Ko-Shao Chen; Vladimir Cech. 2017. "Characteristics of SiOx-containing hard film prepared by low temperature plasma enhanced chemical vapor deposition using hexamethyldisilazane or vinyltrimethylsilane and post oxygen plasma treatment." Materials Chemistry and Physics 189, no. : 183-190.

Journal article
Published: 22 June 2015 in Plasma Processes and Polymers
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Nanoindentation techniques are today a standard tool for the characterization of mechanical properties of thin films at nanoscale. In this feature article, we introduce various techniques, together with their applications for plasma‐polymerized organosilicones: starting from conventional instrumented nanoindentation, followed by continuous oscillatory loading and cyclic nanoindentation by partial unloading for assessing the depth profile of mechanical properties, to continuous mechanical mapping over the sample surface. Methods of analyzing and interpreting the measured data are presented to determine the elastic modulus and hardness of tested films. Plasma polymer films are materials of viscoelastic or elastic–plastic behavior; the correct technique must therefore be selected to give the most accurate mechanical property measurements. A number of limitations of the techniques are also discussed. A list of conditions for successful analysis of mechanical properties is included.

ACS Style

Vladimir Cech; Jaroslav Lukes; Erik Palesch; Tomas Lasota. Elastic Modulus and Hardness of Plasma-Polymerized Organosilicones Evaluated by Nanoindentation Techniques. Plasma Processes and Polymers 2015, 12, 864 -881.

AMA Style

Vladimir Cech, Jaroslav Lukes, Erik Palesch, Tomas Lasota. Elastic Modulus and Hardness of Plasma-Polymerized Organosilicones Evaluated by Nanoindentation Techniques. Plasma Processes and Polymers. 2015; 12 (9):864-881.

Chicago/Turabian Style

Vladimir Cech; Jaroslav Lukes; Erik Palesch; Tomas Lasota. 2015. "Elastic Modulus and Hardness of Plasma-Polymerized Organosilicones Evaluated by Nanoindentation Techniques." Plasma Processes and Polymers 12, no. 9: 864-881.

Journal article
Published: 01 January 2015 in Surface and Coatings Technology
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Vladimir Cech; Tomas Lasota; Erik Palesch; Jaroslav Lukes. The critical influence of surface topography on nanoindentation measurements of a-SiC:H films. Surface and Coatings Technology 2015, 261, 114 -121.

AMA Style

Vladimir Cech, Tomas Lasota, Erik Palesch, Jaroslav Lukes. The critical influence of surface topography on nanoindentation measurements of a-SiC:H films. Surface and Coatings Technology. 2015; 261 ():114-121.

Chicago/Turabian Style

Vladimir Cech; Tomas Lasota; Erik Palesch; Jaroslav Lukes. 2015. "The critical influence of surface topography on nanoindentation measurements of a-SiC:H films." Surface and Coatings Technology 261, no. : 114-121.