Photoinitiated curing of mono‐ and bifunctional epoxides by combination of active chain end and activated monomer cationic polymerization methods |
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| Authors: | Marco Sangermano Mehmet Atilla Tasdelen Yusuf Yagci |
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| Affiliation: | 1. Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, C.so Duca degli Abruzzi, 24 I‐10129 Torino, Italy;2. Marco Sangermano, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, C.so Duca degli Abruzzi, 24 I‐10129 Torino, Italy;3. Yusuf Yagci, Chemistry Department, Faculty of Science and Letters, Istanbul Technical University, Maslak, TR‐34469, Istanbul, Turkey;4. Chemistry Department, Faculty of Science and Letters, Istanbul Technical University, Maslak, TR‐34469, Istanbul, Turkey |
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| Abstract: | Photoinitiated cationic polymerization of mono‐ and bifunctional epoxy monomers, namely cyclohexeneoxide (CHO), 4‐epoxycyclohexylmethyl‐3′,4′‐epoxycyclohexanecarboxylate (EEC), respectively by using sulphonium salts in the presence of hydroxylbutyl vinyl ether (HBVE) was studied. The real‐time FTIR spectroscopic, gel content determination, and thermal characterization studies revealed that both hydroxyl and vinyl ether functionalities of HBVE take part in the polymerization. During the polymerization, HBVE has the ability to react via both active chain end (ACE) and activated monomer mechanisms through its hydroxyl and vinyl ether functionalities, respectively. Thus, more efficient curing was observed with the addition of HBVE into EEC‐containing formulations. It was also demonstrated that HBVE is effective in facilitating the photoinduced crosslinking of monofunctional epoxy monomer, CHO in the absence of a conventional crosslinker. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4914–4920, 2007 |
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| Keywords: | activated monomer polymerization active chain end polymerization cationic polymerization epoxides epoxy resins photochemistry photopolymerization UV curing |
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