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Mr. Panagiotis Goulis
National Technical University of Athens (NTUA)

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0 Chemistry
0 Materials
0 Nanotechnology
0 Organic Synthesis
0 Polymers

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Journal article
Published: 29 April 2021 in Polymers
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This study aims to examine how core–shell super absorbent polymers (SAPs) can be effective in relation to recycling processes by using them as triggerable materials in coating binders. Super absorbent polymers are partially cross-linked, three-dimensional polymer networks that can absorb and retain water. Coatings based on an acrylic binder, including SAPs, were applied onto plastic substrates of acrylonitrile–butadiene–styrene/polycarbonate. The incorporation of 1 wt.% and 5 wt.% SAPs into the coatings resulted in the debonding of the coatings from the substrates under a steam treatment. The trigger mechanism for the core–shell hydrophilic SAPs relies on the different abilities of the core and shell materials to be swollen. Therefore, under the influence of steam, SAPs can enhance their shape due to water absorption and the breaking of the inorganic shell. This results in the reduction of the attachment between the primer layer and both the top coating and the substrate, thus enabling the detachment of the top coating from the corresponding substrate. The obtained results from this study can be considered as potential formulations for plastic recycling applications in industries.

ACS Style

Ioannis Kartsonakis; Panagiotis Goulis; Costas Charitidis. Triggerable Super Absorbent Polymers for Coating Debonding Applications. Polymers 2021, 13, 1432 .

AMA Style

Ioannis Kartsonakis, Panagiotis Goulis, Costas Charitidis. Triggerable Super Absorbent Polymers for Coating Debonding Applications. Polymers. 2021; 13 (9):1432.

Chicago/Turabian Style

Ioannis Kartsonakis; Panagiotis Goulis; Costas Charitidis. 2021. "Triggerable Super Absorbent Polymers for Coating Debonding Applications." Polymers 13, no. 9: 1432.

Journal article
Published: 23 November 2020 in Fibers
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The aim of this study is to synthesize an organic core-shell co-polymer with a different glass transition temperature (Tg) between the core and the shell that can be used for several applications such as the selective debonding of coatings or the release of encapsulated materials. The co-polymer was synthesized using free radical polymerization and was characterized with respect to its morphology, composition and thermal behavior. The obtained results confirmed the successful synthesis of the co-polymer copolymer poly(methyl methacrylate)@poly(methacrylic acid-co-ethylene glycol dimethacrylate), [email protected](MAA-co-EGDMA), which can be used along with water-based solvents. Furthermore, the Tg of the polymer’s core PMMA was 104 °C, while the Tg of the shell P(MAA-co-EGDMA) was 228 °C, making it appropriate for a wide variety of applications. It is worth mentioning that by following this specific experimental procedure, methacrylic acid was copolymerized in water, as the shell of the copolymer, without forming a gel-like structure (hydrogel), as happens when a monomer is polymerized in aqueous media, such as in the case of super-absorbent polymers. Moreover, the addition and subsequent polymerization of the monomer methyl methacrylate (MAA) into the mixture of the already polymerized PMMA resulted in a material that was uniform in size, without any agglomerations or sediments.

ACS Style

Panagiotis Goulis; Ioannis A. Kartsonakis; Costas A. Charitidis. Synthesis and Characterization of a Core-Shell Copolymer with Different Glass Transition Temperatures. Fibers 2020, 8, 71 .

AMA Style

Panagiotis Goulis, Ioannis A. Kartsonakis, Costas A. Charitidis. Synthesis and Characterization of a Core-Shell Copolymer with Different Glass Transition Temperatures. Fibers. 2020; 8 (11):71.

Chicago/Turabian Style

Panagiotis Goulis; Ioannis A. Kartsonakis; Costas A. Charitidis. 2020. "Synthesis and Characterization of a Core-Shell Copolymer with Different Glass Transition Temperatures." Fibers 8, no. 11: 71.

Journal article
Published: 08 December 2019 in Applied Sciences
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In this study, the carbon fiber manufacturing process is investigated, using high-density polyethylene (HDPE) and esterified lignin either with lactic acid (LA) or with poly(lactic acid) (PLA) as precursors. More specifically, lignin was modified using either LA or PLA in order to increase its chemical affinity with HDPE. The modified compounds were continuously melt spun to fibrous materials by blending with HDPE in order to fabricate a carbon fiber precursor. The obtained products were characterized with respect to their morphology, as well as their structure and chemical composition. Moreover, an assessment of both physical and structural transformations after modification of lignin with LA and PLA was performed in order to evaluate the spinning ability of the composite fibers, as well as the thermal processing to carbon fibers. This bottom–up approach seems to be able to provide a viable route considering large scale production in order to transform lignin in value-added product. Tensile tests revealed that the chemical lignin modification allowed an enhancement in its spinning ability due to its compatibility improvement with the commercial low-cost and thermoplastic HDPE polymer. Finally, stabilization and carbonization thermal processing was performed in order to obtain carbon fibers.

ACS Style

Panagiotis Goulis; Ioannis A. Kartsonakis; George Konstantopoulos; Costas A. Charitidis. Synthesis and Processing of Melt Spun Materials from Esterified Lignin with Lactic Acid. Applied Sciences 2019, 9, 5361 .

AMA Style

Panagiotis Goulis, Ioannis A. Kartsonakis, George Konstantopoulos, Costas A. Charitidis. Synthesis and Processing of Melt Spun Materials from Esterified Lignin with Lactic Acid. Applied Sciences. 2019; 9 (24):5361.

Chicago/Turabian Style

Panagiotis Goulis; Ioannis A. Kartsonakis; George Konstantopoulos; Costas A. Charitidis. 2019. "Synthesis and Processing of Melt Spun Materials from Esterified Lignin with Lactic Acid." Applied Sciences 9, no. 24: 5361.

Journal article
Published: 13 November 2017 in C
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The purpose of this study was the synthesis of novel low-cost carbon fibers along with the investigation of the optimal parameters of temperature and time for the stabilization of hybrid high-density polyethylene (HDPE) and lignin melt-spun fibers. These fibers were manufactured by physical compounding of HDPE and chemically-modified softwood kraft lignin (SKL) in order to produce green fiber precursors for carbon fiber synthesis. Stabilization tests were performed with respect to thermal treatment (physical method) and sulfonation treatment (chemical method). The results revealed that only chemical methods induce the desired thermal process-ability to the composite fibers in order to manufacture carbon fibers by using a simple method. This investigation shed light on the stabilization techniques of polymeric fibers in the absence of any cyclic groups in terms of environmentally-friendly mass production of carbon fibers using low-cost and green raw materials. This study facilitates incorporation of softwood lignin in homegrown polymeric fibers by a low-cost production process via melt-spinning of composite fibers, which were successfully stabilized using a facile chemical method and carbonized. Additionally, a comprehensive investigation of the thermal behavior of the samples was accomplished, by examining several ways and aspects of fiber thermal treating. The properties of all studied fibers are presented, compared, and discussed.

ACS Style

Panagiotis Goulis; Giorgos Konstantopoulos; Ioannis A. Kartsonakis; Konstantinos Mpalias; Stavros Anagnou; Dimitrios Dragatogiannis; Costas Charitidis. Thermal Treatment of Melt-Spun Fibers Based on High Density PolyEthylene and Lignin. C 2017, 3, 35 .

AMA Style

Panagiotis Goulis, Giorgos Konstantopoulos, Ioannis A. Kartsonakis, Konstantinos Mpalias, Stavros Anagnou, Dimitrios Dragatogiannis, Costas Charitidis. Thermal Treatment of Melt-Spun Fibers Based on High Density PolyEthylene and Lignin. C. 2017; 3 (4):35.

Chicago/Turabian Style

Panagiotis Goulis; Giorgos Konstantopoulos; Ioannis A. Kartsonakis; Konstantinos Mpalias; Stavros Anagnou; Dimitrios Dragatogiannis; Costas Charitidis. 2017. "Thermal Treatment of Melt-Spun Fibers Based on High Density PolyEthylene and Lignin." C 3, no. 4: 35.