Novel analytical method for the crosslinking process: Infrared thermographic analysis of the thermally latent cationic polymerization of a spiroorthoester and a bifunctional oxetane for the construction of a low‐shrinkage curing system |
| |
| Authors: | Bungo Ochiai Tomomi Nagasawa Yasuhiro Asano Daisuke Nagai Atsushi Sudo Takeshi Endo |
| |
| Institution: | 1. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, Jonan 4‐3‐16, Yonezawa, Yamagata, 992‐8510, Japan;2. Molecular Engineering Institute, Kinki University, 11‐6 Kayanomori, Iizuka, Fukuoka, 820‐8555 Japan;3. Molecular Engineering Institute, Kinki University, 11‐6 Kayanomori, Iizuka, Fukuoka, 820‐8555 JapanDepartment of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, Jonan 4‐3‐16, Yonezawa, Yamagata, 992‐8510, Japan |
| |
| Abstract: | Thermal behaviors were monitored by infrared thermographic analysis in the copolymerization of a spiroorthoester and a bifunctional oxetane with thermally latent initiators benzyl tetrahydrothiophenium hexafluoroantimonate (BTHT) and benzyl 4‐hydroxyphenyl methyl sulfonium hexafluoroantimonate (BPMS)]. The copolymerization with BPMS increased the temperature during the copolymerization more than that with BTHT, whereas the exothermicities were lowered with the increase in the initial feed ratio of the spiroorthocarbonate monomer. The high exothermicity in the copolymerization with BPMS is ascribable to the faster propagation of the oxetane monomer with a high heat of polymerization, and this is supported by model reactions and computational calculation. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2820–2826, 2007 |
| |
| Keywords: | cationic polymerization copolymerization crosslinking infrared spectroscopy latent initiators ring‐opening polymerization |
|
|
