Living carbocationic polymerization. 31. A comprehensive view of the inifer and living mechanisms in isobutylene polymerization

B. Iván, Joseph P. Kennedy

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

The polymerization of isobutylene (IB) has been studied by use of a 1,4-bis(1-chloro-1-methylethyl)benzene (DiCumCl)/BCl3 initiating system in CH3Cl, CH2Cl2, and C2H5Cl solvents and a 90:10 v/v CH3Cl/n-hexane mixture at -75°C. It has been found that in these media the polymerizations are living and that they occur in two phases: an 'initial phase' during which simultaneous slow initiation and chain transfer to DiCumCl ('inifering') plus propagation and reversible termination occur (i.e., a phase characterized by simultaneous inifering and living polymerization) and, after the DiCumCl is consumed, a 'living phase' during which only propagation and reversible termination proceed (i.e., a phase characterized by exclusively living polymerization. By increasing the temperature or by decreasing the medium polarity, termination becomes irreversible. Carbocation stability during the polymerization is strongly affected by solvation effects.

Original languageEnglish
Pages (from-to)2880-2885
Number of pages6
JournalMacromolecules
Volume23
Issue number11
Publication statusPublished - Jan 1 1990

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Living polymerization
Polymerization
Solvation
Benzene
Hexane
isobutylene
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Living carbocationic polymerization. 31. A comprehensive view of the inifer and living mechanisms in isobutylene polymerization. / Iván, B.; Kennedy, Joseph P.

In: Macromolecules, Vol. 23, No. 11, 01.01.1990, p. 2880-2885.

Research output: Contribution to journalArticle

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