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Synthesis of phenol-terminated polyisobutylene: Competitive chain transfer reactions

✍ Scribed by J. M. Rooney

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 386 KB
Volume: 25
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1980.070250710

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✦ Synopsis

Abstract

Polymerization of isobutylene initiated by either aluminum trichloride or tin tetrachloride were conducted in the presence of alkyl phenols in both n‐heptane and methylene dichloride solutions at temperatures between −10 and −70°C. The resultant polymers contained both unsaturated and phenolic endgroups in varying proportions dependent upon reaction conditions. Increased phenol concentrations in the polymerization medium resulted in decreased polymer molecular weights and increased phenol endgroup content. Increased reaction temperature reduced polymer molecular weights and phenol endgroup content. Chain lengths governed by ring alkylation were found to be less sensitive to polymerization temperature than those determined by other modes of chain transfer.

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