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Rebei, Marwa
Czech Academy of Sciences
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article
Accelerating effect of metal ionic liquids for epoxy-anhydride copolymerization
Abstract
@article{REBEI2024113077, title = {Accelerating effect of metal ionic liquids for epoxy-anhydride copolymerization}, journal = {European Polymer Journal}, volume = {212}, pages = {113077}, year = {2024}, issn = {0014-3057}, doi = {https://doi.org/10.1016/j.eurpolymj.2024.113077}, url = {https://www.sciencedirect.com/science/article/pii/S0014305724003380}, author = {Marwa Rebei and Olga Kočková and Matouš Řehák and Sabina Abbrent and Anna Vykydalová and Jan Honzíček and Petra Ecorchard and Hynek Beneš}, keywords = {Ionic liquid, Epoxy resin, Copolymerization, Anhydride, Cross-linking, Kinetics}, abstract = {One of the main drawbacks of high-performance epoxy-anhydride thermosets is slow cross-link kinetics requiring high temperature and long curing cycle. Herein, the accelerating effect of imidazolium metal-based ionic liquids (MILs) bearing (FeCl4)-, (ZnCl4)2-, and (CoCl4)2- anions on epoxy-anhydride copolymerization was investigated. It was observed that MILs accelerated bisphenol diglycidyl ether (DGEBA) − methylhexahydrophthalic anhydride (MHHPA) cross-linking, better than the reference catalysts (1-methylimidazole and 1-butyl-3-methylimidazolium chloride), especially at low temperatures through their ability to activate a rapid anhydride ring opening and formation of carboxyl groups, which initiates polyesterification. A detailed investigation of the polymerization mechanism revealed the formation of alternating epoxy-anhydride copolymers although several MILs-induced initiation mechanisms were detected. Despite the multiple-initiation consisting of imidazole, counter anion, and polyesterification pathways, the cross-linking kinetics was successfully fitted up to vitrification by the Kamal-Sourour model. Finally, MILs-induced cross-linking leads to homogeneous network build-up enabling to produce thermosetting materials with an increased cross-link density, a glass transition temperature above 150 °C, and excellent thermal stability.} }