Accelerating effect of metal ionic liquids for epoxy-anhydride copolymerization

0585552 - ÚMCH 2025 RIV GB eng J - Článek v odborném periodiku
Rebei, Marwa - Kočková, Olga - Řehák, M. - Abbrent, Sabina - Vykydalová, Anna - Honzíček, J. - Ecorchard, Petra - Beneš, Hynek
Accelerating effect of metal ionic liquids for epoxy-anhydride copolymerization.
European Polymer Journal. Roč. 212, 27 May (2024), č. článku 113077. ISSN 0014-3057. E-ISSN 1873-1945
Grant CEP: GA ČR(CZ) GA22-05244S
Institucionální podpora: RVO:61389013 ; RVO:61388980
Klíčová slova: ionic liquid * epoxy resin * copolymerization
Obor OECD: Polymer science; Inorganic and nuclear chemistry (UACH-T)
Impakt faktor: 6, rok: 2022
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0014305724003380?via%3Dihub

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.
Trvalý link: https://hdl.handle.net/11104/0353379