Infrared thermographic analysis on copolymerization of spiroorthoester with oxetane |
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| Authors: | Tomomi Nagasawa Bungo Ochiai Takeshi Endo |
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| Affiliation: | 1. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992–8510, Japan;2. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992–8510, JapanDepartment of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992–8510, Japan |
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| Abstract: | Infrared (IR) thermography was employed to monitor temperature changes during the copolymerization of a spiroorthoester monomer with an oxetane monomer initiated with a benzyl sulfonium salt. The temperature changes in the polymerizations decreased with the increase of the initial feed ratios of the spiroorthocarbonate monomer. For instance, the temperature in the copolymerization of the equimolar mixture of both of the monomers increased only ～1 °C, whereas that in the homopolymerization of the oxetane monomer increased more than 20 °C. This result indicates that the copolymerization employing spiroorthocarbonate monomers effectively suppress temperature increase, which are responsible to shrinkage during cooling. The suppression of polymerization shrinkage by spiroorthocarbonate was also confirmed by density measurement of the polymers using a gas pycnometer. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1388–1393, 2007. |
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| Keywords: | cationic polymerization copolymerization latent polymerization ring‐opening polymerization |
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