The thermal degradations of oligo-isobutylenes having oxygen-containing end groups

A comparative study has been made of the thermal degradations of oligo-isobutylenes having carboxyl or ketonic end groups with that of polyisobutylene as model. The oligo-isobutylenes have found less heat-resistant owing to their content of unstable low mol. wt. fractions, the lower CC bond strengt...

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Bibliographic Details
Published in:Polymer science USSR 1981, Vol.23 (2), p.349-358
Main Authors: Nasybullin, Sh.A., Dyul'deva, A.V., Zaripov, I.N., Bikmukhametova, F.G., Faizullin, I.N.
Format: Article
Language:English
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Summary:A comparative study has been made of the thermal degradations of oligo-isobutylenes having carboxyl or ketonic end groups with that of polyisobutylene as model. The oligo-isobutylenes have found less heat-resistant owing to their content of unstable low mol. wt. fractions, the lower CC bond strength adjacent to the end groups, and to an exothermic chain-transfer reaction at the carboxyl group, in which hydrogen abstraction is coupled with fragmentation and CO 2 liberation, which is followed by a macromolecular decomposition from the chain ends.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(81)90175-1