Carbocationic polymerization in suprecritical CO2 - III. The ceiling temperature of and the effect of temperature on the polymerization of isobutylene

György Deák, Tibor Pernecker, Joseph P. Kennedy

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The polymerization of isobutylene (IB) in supercritical carbon dioxide (SC·CO2) has been investigated in the temperature range from 32.5 to 47.5 °C at 139±3 bar. The in Mn of polyisobutylene (PIB) versus 1/T plot gave ΔH‡Mn, PIB=-14.1±1.5 kcal/mol (-59.1±6.3 kJoule/mol) and ΔS‡Mn, PIB=-31.1±6.2 cal/mol·deg (-130.2±26.0 Joule/mol·deg). These quantities are quite different from those obtained in conventional liquid systems. The ceiling temperature (Tceil) was determined by linear extrapolation of the In Mn versus 1/T plot to the molecular weight of the monomer. According to this procedure the Tceil of IB polymerization in SC·CO2 in about one molar solution at 139±3 bar is 88±9 °C.

Original languageEnglish
Pages (from-to)259-265
Number of pages7
JournalPolymer Bulletin
Volume33
Issue number3
DOIs
Publication statusPublished - Aug 1 1994

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

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