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Prof. Nadka Tzankova Dintcheva obtained her PhD in Chemical Technology and New Materials in 2001 from the University of Palermo (Italy). She was an Assistant Professor at the University of Palermo from 2005 until 2014. She became an Associate Professor in 2015, and currently, she works at the Department of Engineering of the University of Palermo. Her research topics are focused on polymers, biopolymers and their micro-/nano- composites: (i) degradation and stabilization, also considering naturally occurring compounds; (ii) processing and characterizations; (iii) recycling and secondary-life materials applications. She is author of more than 130 publications.
In the last two decades, the naturally occurring polysaccharides, such as chitosan and pectin, have gained great attention having potential applications in different sectors, from biomedical to new generation packaging. Currently, the chitosan and pectic have been proposed as suitable materials also for the formulation of films and coatings for cultural heritage protection, as well as packaging films. Therefore, the formulation of biopolymer films, considering only naturally occurring polymers and additives, is a current challenging trend. This work reports on the formulation of chitosan (CS), pectin (PC), and chitosan:pectin (CS:PC) films, also containing natural crosslinking and reinforcement agents, such as citric acid (CA) and halloysite nanotubes (HNT), through the solvent casting technique. The produced films are characterized through water contact angle measurements, infrared and UV–visible spectroscopy and tensile test, while the durability of the CS:PC films is evaluated subjecting the film to accelerated UVB exposure and monitoring the photo-oxidation degradation in time though infrared spectroscopy. All obtained results suggest that both crosslinking and reinforcement agents have beneficial effects on the wettability, rigidity, and photo-oxidation resistance of biopolymer films. Therefore, these biopolymer films, also containing naturally occurring additives, have good properties and performance and they are suitable as coverage films for cultural heritage protection.
Giulia Infurna; Giuseppe Cavallaro; Giuseppe Lazzara; Stefana Milioto; Nadka Dintcheva. Understanding the Effects of Crosslinking and Reinforcement Agents on the Performance and Durability of Biopolymer Films for Cultural Heritage Protection. Molecules 2021, 26, 3468 .
AMA StyleGiulia Infurna, Giuseppe Cavallaro, Giuseppe Lazzara, Stefana Milioto, Nadka Dintcheva. Understanding the Effects of Crosslinking and Reinforcement Agents on the Performance and Durability of Biopolymer Films for Cultural Heritage Protection. Molecules. 2021; 26 (11):3468.
Chicago/Turabian StyleGiulia Infurna; Giuseppe Cavallaro; Giuseppe Lazzara; Stefana Milioto; Nadka Dintcheva. 2021. "Understanding the Effects of Crosslinking and Reinforcement Agents on the Performance and Durability of Biopolymer Films for Cultural Heritage Protection." Molecules 26, no. 11: 3468.
The European Union is working towards the 2050 net-zero emissions goal and tackling the ever-growing environmental and sustainability crisis by implementing the European Green Deal. The shift towards a more sustainable society is intertwined with the production, use, and disposal of plastic in the European economy. Emissions generated by plastic production, plastic waste, littering and leakage in nature, insufficient recycling, are some of the issues addressed by the European Commission. Adoption of bioplastics–plastics that are biodegradable, bio-based, or both–is under assessment as one way to decouple society from the use of fossil resources, and to mitigate specific environmental risks related to plastic waste. In this work, we aim at reviewing the field of bioplastics, including standards and life cycle assessment studies, and discuss some of the challenges that can be currently identified with the adoption of these materials.
Alberto Di Bartolo; Giulia Infurna; Nadka Dintcheva. A Review of Bioplastics and Their Adoption in the Circular Economy. Polymers 2021, 13, 1229 .
AMA StyleAlberto Di Bartolo, Giulia Infurna, Nadka Dintcheva. A Review of Bioplastics and Their Adoption in the Circular Economy. Polymers. 2021; 13 (8):1229.
Chicago/Turabian StyleAlberto Di Bartolo; Giulia Infurna; Nadka Dintcheva. 2021. "A Review of Bioplastics and Their Adoption in the Circular Economy." Polymers 13, no. 8: 1229.
Different human activities have caused and currently cause catastrophic environmental phenomena, and unfortunately, a significant negative contribution to these catastrophic phenomena can be attributed to uncontrolled plastic production, use and release everywhere. On the other hand, the plastics offer numerous comforts and advantages, and for this reason, the modern life is unthinkable without plastic. Currently, numerous scientific papers and large audience advertisings, related to the production and use of polymers made by natural sources, i.e. bio-based polymers, as a valid alternative to the petroleum-based counterparts, have been published. Therefore, for production of daily disposables and usages, the choice of petroleum-based polymers, coming from fossil-based resources, or bio-based polymers, coming from renewable resources, can be correctly understood and evaluated taking into account different issues concerning resources supplying, production technology and costs, application properties and performance, and finally, waste management. Current paper is focused on a reflection point related to waste management through burning/incineration (i.e. oxidation) of disposable beverage cups (volume 200 ml). The simple calculations of oxidation process of petrol-based or bio-based materials, which is the theoretical basis of waste management through burning/incineration, highlights that none of cup materials, can be considered better than the others to produce daily disposables and usages.
Nadka Tz. Dintcheva; Giulia Infurna; Francesca D'Anna. End-of-life and waste management of disposable beverage cups. Science of The Total Environment 2020, 763, 143044 .
AMA StyleNadka Tz. Dintcheva, Giulia Infurna, Francesca D'Anna. End-of-life and waste management of disposable beverage cups. Science of The Total Environment. 2020; 763 ():143044.
Chicago/Turabian StyleNadka Tz. Dintcheva; Giulia Infurna; Francesca D'Anna. 2020. "End-of-life and waste management of disposable beverage cups." Science of The Total Environment 763, no. : 143044.
In the last decade, the interest toward the formulation of polymer films for cultural heritage protection continuously grew, and these films must be imperatively transparent, removable, and should not react/interact with surface of the artworks. In this research, bionanocomposite films, based on chitosan (Ch) and pectin (P) and containing naturally occurring fillers and antioxidants, were formulated by solvent casting methods and were accurately characterized. The natural halloysite nanotubes (HNT) have a two-fold role, specifically, physical compatibilizer and antioxidant carrier. Therefore, the theoretical solubility between Ch and P was estimated considering Hoy’s method for solubility of polymers, while the optimum ratio between biopolymer constituents was assessed by ζ-potential measurements. The transparency, wettability, and mechanical behavior of Ch:P films, also in presence of HNT without and with antioxidants, were investigated. The beneficial effects of natural antioxidants, such as vanillic acid (VA) and quercetin (Q), on Ch:P/HNT durability were found.
Giulia Infurna; Giuseppe Cavallaro; Giuseppe Lazzara; Stefana Milioto; Nadka Tzankova Dintcheva. Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection. Polymers 2020, 12, 1973 .
AMA StyleGiulia Infurna, Giuseppe Cavallaro, Giuseppe Lazzara, Stefana Milioto, Nadka Tzankova Dintcheva. Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection. Polymers. 2020; 12 (9):1973.
Chicago/Turabian StyleGiulia Infurna; Giuseppe Cavallaro; Giuseppe Lazzara; Stefana Milioto; Nadka Tzankova Dintcheva. 2020. "Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection." Polymers 12, no. 9: 1973.
Eco-friendly in-situ stabilised biopolymer nanocomposites based on polyamide 11 (PA11) and polylactic acid (PLA) were prepared by melt mixing in the presence of a modified organo-montmorillonite clay containing a chemically-bound hindered amine UV-stabilising function, [(UV)OM-MMt]. Characterisation of the newly synthesised organo-modifier containing the reactive hindered amine (HAS) UV-stabilising function [(UV)OM] has confirmed a successful synthesis. The (UV)OM was then introduced into NaMMt through ion exchange reaction to prepare the UV stabiliser-bound organo-modified-MMt, [(UV)OM-MMt]. The in-situ stabilised PA11- and PLA- nanocomposites (PA11-(UV)OM-MMt and PLA-(UV)OM-MMt) were characterised and their photoxidative stabilities (under accelerated weathering conditions) were compared with their nanocomposite analogues containing either the organo-modified MMt (OM-MMt) alone (i.e. without UV-stabiliser) or the OM-MMT containing conventionally added commercial hindered amine HAS-UV-stabiliser (Cyasorb® UV-3853). It was found that both of the newly prepared in-situ stabilised PA11- and PLA- nanocomposites gave good clay dispersion and have demonstrated a much higher, especially in PLA-nanocomposites, photo-oxidative stability compared to the corresponding nanocomposites but in the absence, or the presence, of the conventionally added HAS-UV-stabiliser.
Nadka Tz Dintcheva; Sahar Al-Malaika. Photo-stabilization of biopolymers-based nanocomposites with UV-modified layered silicates. Polymer Degradation and Stability 2020, 179, 109252 .
AMA StyleNadka Tz Dintcheva, Sahar Al-Malaika. Photo-stabilization of biopolymers-based nanocomposites with UV-modified layered silicates. Polymer Degradation and Stability. 2020; 179 ():109252.
Chicago/Turabian StyleNadka Tz Dintcheva; Sahar Al-Malaika. 2020. "Photo-stabilization of biopolymers-based nanocomposites with UV-modified layered silicates." Polymer Degradation and Stability 179, no. : 109252.
Carbon Nanotubes (CNT) and Graphene Nanoplatelets (GNP) were incorporated in Polypropylene (PP) as single filler (CNT = 1, 2 and 4 %wt. and GNP = 2, 4, and 6 %wt.) and in hybrid form (CNT:GNP weight ratio 2:2, 2:4 and 4:2) using a prototype miniature Twin Screw Extruder (TSE) coupled with a double slit rheological die, in order to assess in-line the extent of nanofiller dispersion and to deliver PP-based nanocomposites with enhanced thermo-oxidative stability. The morphological, electrical and mechanical properties, as well as the resistance to thermal and photo degradation of the composites containing single nanofillers (PP/CNT and PP/GNP) were compared with those of hybrid PP based nanocomposites (PP/CNT:GNP). The results highlight that the presence of the two carbonaceous nanofillers exerts a positive synergic effect on the nanocomposite properties. Moreover, the radical scavenging role of the carbonaceous nanofillers was investigated under thermo-mechanical, thermo- and photo degradation conditions, the results confirming that aspect ratio, loading and dispersion level of the filler play a determinant role in the nanocomposite durability.
Giulia Infurna; Paulo F. Teixeira; Nadka Tz. Dintcheva; Loic Hilliou; Francesco Paolo La Mantia; Jose A. Covas. Taking advantage of the functional synergism between carbon nanotubes and graphene nanoplatelets to obtain polypropylene-based nanocomposites with enhanced oxidative resistance. European Polymer Journal 2020, 133, 109796 .
AMA StyleGiulia Infurna, Paulo F. Teixeira, Nadka Tz. Dintcheva, Loic Hilliou, Francesco Paolo La Mantia, Jose A. Covas. Taking advantage of the functional synergism between carbon nanotubes and graphene nanoplatelets to obtain polypropylene-based nanocomposites with enhanced oxidative resistance. European Polymer Journal. 2020; 133 ():109796.
Chicago/Turabian StyleGiulia Infurna; Paulo F. Teixeira; Nadka Tz. Dintcheva; Loic Hilliou; Francesco Paolo La Mantia; Jose A. Covas. 2020. "Taking advantage of the functional synergism between carbon nanotubes and graphene nanoplatelets to obtain polypropylene-based nanocomposites with enhanced oxidative resistance." European Polymer Journal 133, no. : 109796.
The photo-oxidative degradation processes of bio-based PA11 nanocomposites containing montmorillonite (MMT) and the organo-modified Cloisite®30B were investigated to discriminate the influence of organo-modified components on the polymer durability. Indeed, despite the extensive studies reported, there are still ambiguous points to be clarified from the chemical point of view. To this aim, UV-aged materials were analyzed by Size Exclusion Chromatography (SEC), Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) and Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS). This enabled determining changes in both chemical structure and Molar Masses (MMs) induced by light, heat and oxygen exposure. The addition of organo-modified nanoclays strongly affected the PA11 light durability, triggering the macromolecular chains scission due to the typical αH, Norrish I and II mechanisms. However, the main contribution in boosting the photo-oxidative degradation is induced by iron impurities contained into the clays. Conversely, thermo-oxidation process performed at 215 °C was unambiguously affected by the presence of the organo-modifiers, whose presence determined an enhancement of crosslinking reactions.
Martina Ussia; Giusy Curcuruto; Daniela Zampino; Nadka Tzankova Dintcheva; Giovanni Filippone; Raniero Mendichi; Sabrina Carola Carroccio. Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites. Polymers 2020, 12, 1034 .
AMA StyleMartina Ussia, Giusy Curcuruto, Daniela Zampino, Nadka Tzankova Dintcheva, Giovanni Filippone, Raniero Mendichi, Sabrina Carola Carroccio. Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites. Polymers. 2020; 12 (5):1034.
Chicago/Turabian StyleMartina Ussia; Giusy Curcuruto; Daniela Zampino; Nadka Tzankova Dintcheva; Giovanni Filippone; Raniero Mendichi; Sabrina Carola Carroccio. 2020. "Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites." Polymers 12, no. 5: 1034.
In the last few decades, the interest towards natural compounds, coming from a natural source and biodegradable, for biopolymers is always increasing because of a public request for the formulation of safe, eco-friendly, and sustainable materials. The main classes of natural compounds for biopolymers are: (i) naturally occurring fillers (nFil), such as nano-/micro- sized layered alumino-silicate: halloysite, bentonite, montmorillonite, hydroxyapatite, calcium carbonate, etc.; (ii) naturally occurring fibers (nFib), such as wood and vegetable fibers; (iii) naturally occurring antioxidant molecules (nAO), such as phenols, polyphenols, vitamins, and carotenoids. However, in this short review, the advantages and drawbacks, considering naturally occurring compounds as safe, eco-friendly, and sustainable additives for biopolymers, have been focused and discussed briefly, even taking into account the requests and needs of different application fields.
Nadka Tzankova Dintcheva; Giulia Infurna; Marilena Baiamonte; Francesca D’Anna. Natural Compounds as Sustainable Additives for Biopolymers. Polymers 2020, 12, 732 .
AMA StyleNadka Tzankova Dintcheva, Giulia Infurna, Marilena Baiamonte, Francesca D’Anna. Natural Compounds as Sustainable Additives for Biopolymers. Polymers. 2020; 12 (4):732.
Chicago/Turabian StyleNadka Tzankova Dintcheva; Giulia Infurna; Marilena Baiamonte; Francesca D’Anna. 2020. "Natural Compounds as Sustainable Additives for Biopolymers." Polymers 12, no. 4: 732.
Current concerns for sustainability and the environment make low-impact materials desirable for environmental remediation and, in particular wastewater treatment. We obtained supramolecular gels of l-amino acids in the deep eutectic solvent formed by choline chloride and phenylacetic acid. After gel characterization, and investigating gel-sol transition temperatures, gelation kinetics, rheological properties, and morphology, the gels were applied as sorbents to remove cationic dyes from aqueous solutions. The effects of the pH, dye nature, volume, and concentration of wastewater were analyzed, and the best result was obtained with a l-phenylalanine-based eutectogel. It can be reused for at least 9 times without losing efficiency, also with dye mixtures. Interestingly, this gel can be loaded onto columns to decolorize flowing solutions, achieving 85 % of removal efficiency in only 10 minutes and allowing its reuse for at least 4 cycles. In terms of adsorption capacity, this eutectogel is competitive with efficient gel-based dye sorbent systems, with a value 1930 mg/g reached at a high concentration of rhodamine B 479 mg/L.
Salvatore Marullo; Alessandro Meli; Nadka. Tz. Dintcheva; Giulia Infurna; Carla Rizzo; Francesca D'anna. Environmentally Friendly Eutectogels Comprising l‐a mino Acids and Deep Eutectic Solvents: Efficient Materials for Wastewater Treatment. ChemPlusChem 2020, 85, 301 -311.
AMA StyleSalvatore Marullo, Alessandro Meli, Nadka. Tz. Dintcheva, Giulia Infurna, Carla Rizzo, Francesca D'anna. Environmentally Friendly Eutectogels Comprising l‐a mino Acids and Deep Eutectic Solvents: Efficient Materials for Wastewater Treatment. ChemPlusChem. 2020; 85 (2):301-311.
Chicago/Turabian StyleSalvatore Marullo; Alessandro Meli; Nadka. Tz. Dintcheva; Giulia Infurna; Carla Rizzo; Francesca D'anna. 2020. "Environmentally Friendly Eutectogels Comprising l‐a mino Acids and Deep Eutectic Solvents: Efficient Materials for Wastewater Treatment." ChemPlusChem 85, no. 2: 301-311.
Due to large drug consumption, pharmaceutically active compounds (PhACs) can be found as water contaminants. The removal of PhACs is a significant issue, as they can easily overtake traditional purification methods. Because of their surface properties, carbon nanomaterials are among the most efficient materials able to adsorb PhACs. However, their limitation is their recovery after use and their possible leakage into the aquatic system. Consequently, new hybrid supramolecular ionic liquid gels (HILGs) have been designed for the adsorption of some antibiotic drugs (ciprofloxacin and nalidixic acid) from water. The chemical-physical properties of gels, such as the temperature of the gel-sol transition, morphology, and rheology, have been studied for their use as sorbents. These properties influence the gel removal efficiency of PhAC, i.e., the best system is the gel that presents weaker colloidal forces. A fast removal (RE = 51%) is obtained in 3 h for ciprofloxacin, while a slower adsorption process is observed for nalidixic acid (RE = 88% in 24 h). HILGs can be recycled up to seven cycles and regenerated. In addition, they can be used with higher concentrations or volumes of PhAC and in a realistic apparatus like dialysis membranes. These peculiarities suggest that HILGs can be competitive with more complex sorbent systems.
Carla Rizzo; Salvatore Marullo; Nadka Tz. Dintcheva; Francesca D’Anna. Carbon Nanomaterial Doped Ionic Liquid Gels for the Removal of Pharmaceutically Active Compounds from Water. Molecules 2019, 24, 2788 .
AMA StyleCarla Rizzo, Salvatore Marullo, Nadka Tz. Dintcheva, Francesca D’Anna. Carbon Nanomaterial Doped Ionic Liquid Gels for the Removal of Pharmaceutically Active Compounds from Water. Molecules. 2019; 24 (15):2788.
Chicago/Turabian StyleCarla Rizzo; Salvatore Marullo; Nadka Tz. Dintcheva; Francesca D’Anna. 2019. "Carbon Nanomaterial Doped Ionic Liquid Gels for the Removal of Pharmaceutically Active Compounds from Water." Molecules 24, no. 15: 2788.
Polymers and biopolymers are continuously subjected to the action of different stress factors, such as oxygen, heat, UV light, mechanical stress, humidity, etc., during their processing and service life, undergoing overall oxidative degradation, that causes performance and properties deterioration. To improve the resistance at high temperature and long-term weatherability of the polymers and biopolymers, usually, during their manufacturing, synthetic antioxidants and UV-light stabilizers are added. In the last decade, several concerns related to the impact of the synthetic stabilizers have emerged, and to reduce their negative effect on human health and environment, the replacement with naturally occurring molecules, having similar protection ability, is greatly welcome. It has been demonstrated that several natural polyphenols, vitamins and carotenoids are efficient and suitable stabilizers for polymers and biopolymers protection against their oxidative degradation. Besides, it is worth noting that some natural compounds exhibit concentration-dependent anti-/pro- oxidant activity in biopolymers and polymers, for the rational control of the additive contents. In this perspective, we briefly analyze the current results related to innovation in considering natural molecules for polymer and biopolymer protection or pro-oxidation, having potential industrial applications, pointing out some advantages, e.g. protection actions, and drawbacks, e.g. pro-oxidant and/or plasticizing actions, of these approaches.
Nadka Tzankova Dintcheva; Francesca D’Anna. Anti-/Pro-Oxidant Behavior of Naturally Occurring Molecules in Polymers and Biopolymers: A Brief Review. ACS Sustainable Chemistry & Engineering 2019, 7, 12656 -12670.
AMA StyleNadka Tzankova Dintcheva, Francesca D’Anna. Anti-/Pro-Oxidant Behavior of Naturally Occurring Molecules in Polymers and Biopolymers: A Brief Review. ACS Sustainable Chemistry & Engineering. 2019; 7 (15):12656-12670.
Chicago/Turabian StyleNadka Tzankova Dintcheva; Francesca D’Anna. 2019. "Anti-/Pro-Oxidant Behavior of Naturally Occurring Molecules in Polymers and Biopolymers: A Brief Review." ACS Sustainable Chemistry & Engineering 7, no. 15: 12656-12670.
In this work, naturally occurring compounds, such as Vitamin E (VE) and Ferulic Acid (FA), at high concentrations, have been considered as pro-degradant agents for Low Density Polyethylene (PE). However, all obtained results using the naturally occurring molecules as pro-oxidant agents for PE have been compared with the results achieved using a classical pro-oxidant agent, such as calcium stearate (Ca stearate) and with neat PE. The preliminary characterization, through rheological, mechanical and thermal analysis, of the PE-based systems highlights that the used naturally occurring molecules are able to exert a slight plasticizing action on PE and subsequently the PE rigidity and crystallinity slightly decrease, while the ductility increases. To assess the pro-degradant activity of the considered naturally occurring compounds, thin films of neat PE and PE-based systems containing 2 and 3 wt.% Ca stearate, VE and FA have been produced and subjected to accelerated weathering upon UVB light exposure. All obtained results point out that the VE and FA, at these high concentrations, exert a clear pro-oxidant activity in PE and this pro-oxidant activity is very similar to that exerted by Ca stearate. Moreover, the VE and FA at high concentrations can be considered as suitable eco-friendly pro-degradant additives for PE, also in order to control the polyolefin degradation times.
Nadka Tzankova Dintcheva; Delia Gennaro; Rosalia Teresi; Marilena Baiamonte. Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions. Materials 2019, 12, 195 .
AMA StyleNadka Tzankova Dintcheva, Delia Gennaro, Rosalia Teresi, Marilena Baiamonte. Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions. Materials. 2019; 12 (1):195.
Chicago/Turabian StyleNadka Tzankova Dintcheva; Delia Gennaro; Rosalia Teresi; Marilena Baiamonte. 2019. "Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions." Materials 12, no. 1: 195.
Currently, the use of polymers and biopolymers as soil-stabilizer additives for control of the soil degradation, deterioration, and desertification and for improving the arid and semiarid soils has been expanded significantly in the agricultural sector. This research was conducted to determine the effect of naturally occurring compounds, such as quercetin (Q) and sodium montmorillonite (NaMMt) at different weight ratios, in biopolyester, such as polylactic acid (PLA), aiming to formulate ecosustainable materials to control the soil degradation and to protect the environment. As known, the use of sophisticated analytical tools to describe the material rheology and melting properties is nowadays very popular among physicists and material scientists. Certainly, several experimental tests conducted on polymeric- and biopolymeric-based materials, such as rubbers, foams, and hydro/aero gels, show that the relaxation time spectra are a continuous function, and as a consequence, multiple relaxation times are involved in the rheological description of the materials, yielding the need for nonconventional relaxation functions. Indeed, in this work, the considered fractional-order model could be considered a powerful tool to describe and to predict the melting properties of the complex polymer-based systems containing different additives.
Nadka Tzankova Dintcheva; Marilena Baiamonte; Rosalia Teresi; Gioacchino Alotta; Emanuela Bologna; Massimiliano Zingales. A Fractional-Order Model of Biopolyester Containing Naturally Occurring Compounds for Soil Stabilization. Advances in Materials Science and Engineering 2019, 2019, 1 -6.
AMA StyleNadka Tzankova Dintcheva, Marilena Baiamonte, Rosalia Teresi, Gioacchino Alotta, Emanuela Bologna, Massimiliano Zingales. A Fractional-Order Model of Biopolyester Containing Naturally Occurring Compounds for Soil Stabilization. Advances in Materials Science and Engineering. 2019; 2019 ():1-6.
Chicago/Turabian StyleNadka Tzankova Dintcheva; Marilena Baiamonte; Rosalia Teresi; Gioacchino Alotta; Emanuela Bologna; Massimiliano Zingales. 2019. "A Fractional-Order Model of Biopolyester Containing Naturally Occurring Compounds for Soil Stabilization." Advances in Materials Science and Engineering 2019, no. : 1-6.
In this work, natural phenolic compounds, such as Vanillic Acid (VA), Ferulic Acid (FA) and Thymol (Th), at very high concentrations, have been considered as pro-oxidant agents for Polylactic acid (PLA). Specifically, thin films of neat PLA and PLA-based systems containing 2 and 3 wt% of VA, FA and Th have been produced and subjected to accelerated degradation in different environmental conditions. Preliminary characterizations, through rheological, mechanical, optical and morphological analysis, of the formulated PLA-based systems show that the VA and FA, even less the Th, are able to exert a plasticizing action during the processing and subsequently, the PLA crystallinity and rigidity slightly decrease, while, the PLA ductility increase and its optical performance and morphology remain almost unchanged. To assess the pro-oxidant activity of the considered natural phenolic compounds, thin films of PLA and PLA-based systems containing VA, FA and Th have been subjected to accelerated degradation in different environmental conditions: (i) water-medium hydrolysis, (ii) photo-oxidation upon UVB exposure and (iii) thermo-oxidation upon thermal treatment in oven. All obtained results pointing out that the considered natural compounds, at these high concentrations, exert a clear pro-oxidant activity in PLA during the water-medium hydrolysis and the photo- and thermo-oxidative degradation. Moreover, the VA, FA and Th can be considered as suitable pro-degradant additives for PLA, also in order to control the bio-polyester degradation times.
Nadka Tzankova Dintcheva; Marilena Baiamonte; Marilena Spera. Assessment of pro-oxidant activity of natural phenolic compounds in bio-polyesters. Polymer Degradation and Stability 2018, 152, 280 -288.
AMA StyleNadka Tzankova Dintcheva, Marilena Baiamonte, Marilena Spera. Assessment of pro-oxidant activity of natural phenolic compounds in bio-polyesters. Polymer Degradation and Stability. 2018; 152 ():280-288.
Chicago/Turabian StyleNadka Tzankova Dintcheva; Marilena Baiamonte; Marilena Spera. 2018. "Assessment of pro-oxidant activity of natural phenolic compounds in bio-polyesters." Polymer Degradation and Stability 152, no. : 280-288.
Rossella Arrigo; Nadka Tzankova Dintcheva; Giuseppe Tarantino; Elisa Passaglia; Serena Coiai; Francesca Cicogna; Sara Filippi; Giorgio Nasillo; Delia Chillura Martino. An insight into the interaction between functionalized thermoplastic elastomer and layered double hydroxides through rheological investigations. Composites Part B: Engineering 2018, 139, 47 -54.
AMA StyleRossella Arrigo, Nadka Tzankova Dintcheva, Giuseppe Tarantino, Elisa Passaglia, Serena Coiai, Francesca Cicogna, Sara Filippi, Giorgio Nasillo, Delia Chillura Martino. An insight into the interaction between functionalized thermoplastic elastomer and layered double hydroxides through rheological investigations. Composites Part B: Engineering. 2018; 139 ():47-54.
Chicago/Turabian StyleRossella Arrigo; Nadka Tzankova Dintcheva; Giuseppe Tarantino; Elisa Passaglia; Serena Coiai; Francesca Cicogna; Sara Filippi; Giorgio Nasillo; Delia Chillura Martino. 2018. "An insight into the interaction between functionalized thermoplastic elastomer and layered double hydroxides through rheological investigations." Composites Part B: Engineering 139, no. : 47-54.
Rossella Arrigo; Rosalia Teresi; Nadka Tzankova Dintcheva. Mechanical and rheological properties of polystyrene-block-polybutadiene-block-polystyrene copolymer reinforced with carbon nanotubes: effect of processing conditions. nano Online 2018, 1 .
AMA StyleRossella Arrigo, Rosalia Teresi, Nadka Tzankova Dintcheva. Mechanical and rheological properties of polystyrene-block-polybutadiene-block-polystyrene copolymer reinforced with carbon nanotubes: effect of processing conditions. nano Online. 2018; ():1.
Chicago/Turabian StyleRossella Arrigo; Rosalia Teresi; Nadka Tzankova Dintcheva. 2018. "Mechanical and rheological properties of polystyrene-block-polybutadiene-block-polystyrene copolymer reinforced with carbon nanotubes: effect of processing conditions." nano Online , no. : 1.
The aim of this work is the investigation of the effect of ultrasound treatment on the structural characteristics of carbon nanotubes (CNTs) and the consequent influence that the shortening induced by sonication exerts on the morphology, rheological behaviour and thermo-oxidative resistance of ultra-high molecular weight polyethylene (UHMWPE)-based nanocomposites. First, CNTs have been subjected to sonication for different time intervals and the performed spectroscopic and morphological analyses reveal that a dramatic decrease of the CNT’s original length occurs with increased sonication time. The reduction of the initial length of CNTs strongly affects the nanocomposite rheological behaviour, which progressively changes from solid-like to liquid-like as the CNT sonication time increases. The study of the thermo-oxidative behaviour of the investigated nanocomposites reveals that the CNT sonication has a detrimental effect on the thermo-oxidative stability of nanocomposites, especially for long exposure times. The worsening of the thermo-oxidative resistance of sonicated CNT-containing nanocomposites could be attributed to the lower thermal conductivity of low-aspect-ratio CNTs, which causes the increase of the local temperature at the polymer/nanofillers interphase, with the consequent acceleration of the degradative phenomena.
Rossella Arrigo; Rosalia Teresi; Cristian Gambarotti; Filippo Parisi; Giuseppe Lazzara; Nadka Tzankova Dintcheva. Sonication-Induced Modification of Carbon Nanotubes: Effect on the Rheological and Thermo-Oxidative Behaviour of Polymer-Based Nanocomposites. Materials 2018, 11, 383 .
AMA StyleRossella Arrigo, Rosalia Teresi, Cristian Gambarotti, Filippo Parisi, Giuseppe Lazzara, Nadka Tzankova Dintcheva. Sonication-Induced Modification of Carbon Nanotubes: Effect on the Rheological and Thermo-Oxidative Behaviour of Polymer-Based Nanocomposites. Materials. 2018; 11 (3):383.
Chicago/Turabian StyleRossella Arrigo; Rosalia Teresi; Cristian Gambarotti; Filippo Parisi; Giuseppe Lazzara; Nadka Tzankova Dintcheva. 2018. "Sonication-Induced Modification of Carbon Nanotubes: Effect on the Rheological and Thermo-Oxidative Behaviour of Polymer-Based Nanocomposites." Materials 11, no. 3: 383.
Novel hybrid diimidazolium-based ionogels were obtained by dispersing nitrogen-doped carbon nanodots (NCNDs) in ionic liquid (IL) solutions and by using dicationic organic salts as gelators. The properties of the NCNDs-ionogels were analyzed in terms of thermal stability, mechanical strength, morphology, gel-sol transitions, rheological and atomic force microscopy analysis. Insights into the formation of the hybrid soft material were attained from kinetics of sol to gel phase transition and from estimating the size of the aggregates, gained from opacity and resonance light scattering measurements. We demonstrate that, on one hand, the NCNDs were able to favor gel formation both in the presence of gelating and non-gelating ILs. On the other hand, the gelatinous matrix retains and, in some cases improves, the properties of NCNDs. The NCNDs-ionogels showed the typical fluorescence emission and a remarkable anti-radical activity, with higher efficiency as compared to the single components. The presented hybrid materials hold great promise for topical applications in anti-oxidant fields.
Carla Rizzo; Francesca Arcudi; Luka Đorđević; Nadka Tzankova Dintcheva; Renato Noto; Francesca D’Anna; Maurizio Prato. Nitrogen-Doped Carbon Nanodots-Ionogels: Preparation, Characterization, and Radical Scavenging Activity. ACS Nano 2018, 12, 1296 -1305.
AMA StyleCarla Rizzo, Francesca Arcudi, Luka Đorđević, Nadka Tzankova Dintcheva, Renato Noto, Francesca D’Anna, Maurizio Prato. Nitrogen-Doped Carbon Nanodots-Ionogels: Preparation, Characterization, and Radical Scavenging Activity. ACS Nano. 2018; 12 (2):1296-1305.
Chicago/Turabian StyleCarla Rizzo; Francesca Arcudi; Luka Đorđević; Nadka Tzankova Dintcheva; Renato Noto; Francesca D’Anna; Maurizio Prato. 2018. "Nitrogen-Doped Carbon Nanodots-Ionogels: Preparation, Characterization, and Radical Scavenging Activity." ACS Nano 12, no. 2: 1296-1305.
The covalent immobilization of hindered phenol groups, with potential antioxidant activity, onto an ethylene/α-olefin (EOC) copolymer was carried out by the nitroxide radical coupling (NRC) reaction performed in the melt with a peroxide and the 3,5-di-tert-butyl-4-hydroxybenzoyl-2,2,6,6-tetramethylpiperidine-1-oxyl radical (BHB-T). Functionalized EOC (EOC-g-(BHB-T)) was exposed to photo- and thermo-oxidation. By comparison with some model compounds bearing the (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) moiety or the hindered phenol unit, it was observed that the grafted BHB-T could effectively help the stabilization of the polymer matrix both under photo- and thermo-oxidation. In addition, the immobilization of BHB-T can effectively increase the service life of the functionalized polymers when polymer films were put in contact with ethanol solution thus simulating a possible application of the modified polymer.
Serena Coiai; Francesca Cicogna; Chengcheng Yang; Veronika Tempesti; Sabrina Carola Carroccio; Giuliana Gorrasi; Raniero Mendichi; Nadka Tz. Dintcheva; Elisa Passaglia. Grafting of Hindered Phenol Groups onto Ethylene/α-Olefin Copolymer by Nitroxide Radical Coupling. Polymers 2017, 9, 670 .
AMA StyleSerena Coiai, Francesca Cicogna, Chengcheng Yang, Veronika Tempesti, Sabrina Carola Carroccio, Giuliana Gorrasi, Raniero Mendichi, Nadka Tz. Dintcheva, Elisa Passaglia. Grafting of Hindered Phenol Groups onto Ethylene/α-Olefin Copolymer by Nitroxide Radical Coupling. Polymers. 2017; 9 (12):670.
Chicago/Turabian StyleSerena Coiai; Francesca Cicogna; Chengcheng Yang; Veronika Tempesti; Sabrina Carola Carroccio; Giuliana Gorrasi; Raniero Mendichi; Nadka Tz. Dintcheva; Elisa Passaglia. 2017. "Grafting of Hindered Phenol Groups onto Ethylene/α-Olefin Copolymer by Nitroxide Radical Coupling." Polymers 9, no. 12: 670.
Nadka Tzankova Dintcheva; Sahar Al-Malaika; Rossella Arrigo; Elisabetta Morici. Novel strategic approach for the thermo- and photo- oxidative stabilization of polyolefin/clay nanocomposites. Polymer Degradation and Stability 2017, 145, 41 -51.
AMA StyleNadka Tzankova Dintcheva, Sahar Al-Malaika, Rossella Arrigo, Elisabetta Morici. Novel strategic approach for the thermo- and photo- oxidative stabilization of polyolefin/clay nanocomposites. Polymer Degradation and Stability. 2017; 145 ():41-51.
Chicago/Turabian StyleNadka Tzankova Dintcheva; Sahar Al-Malaika; Rossella Arrigo; Elisabetta Morici. 2017. "Novel strategic approach for the thermo- and photo- oxidative stabilization of polyolefin/clay nanocomposites." Polymer Degradation and Stability 145, no. : 41-51.