Distribution of double bonds in thermally degraded polyisobutylene |
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| Authors: | Takeshi Kuroki Takashi Sawaguchi Kazumasa Suzuki Shoaki Ide Tadashi Ikemura |
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| Affiliation: | Department of Industrial Chemistry, College of Science and Technology, Nihon University, Kandasurugadai, Chiyoda-ku, Tokyo 101, Japan |
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| Abstract: | The distribution of double bonds in thermally degraded polyisobutylene was determined quantitatively by using pulsed Fourier transform 1H n.m.r. spectroscopic analysis. The double bonds in the degraded polymer did not exist in the interior but at the terminal positions of the polymer chain. These olefins were of the terminal trisubstituted and terminal vinylidene types. The content of the former was much greater than that of the latter. This shows that radical chain transfer predominantly occurs at the methylene hydrogen rather than at the methyl groups of the polymer chain. The average number of double bonds per molecule, f, was greater than 1 and tended to be near 2. Thereby most of the degraded polyisobutylene was shown to have two terminal unsaturations per molecule. |
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| Keywords: | Thermal degradation double bond polyisobutylene telechelics reactive oligomer |
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