Polymerization of isobutylene and copolymerization of isobutylene with isoprene promoted by methylalumoxane

Anatoly Lisovskii, Elza Nelkenbaum, Victoria Volkis, Rafi Semiat, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Methylalumoxane (MAO) is an active pre-catalyst for the polymerization of isobutylene and the copolymerization of isobutylene with isoprene at ambient temperature. The absence of any proton-containing substances suggests that the solvent dichloromethane reacts with the MAO forming the active cationic species. In the presence of toluene, as the solvent, the reaction rate is extremely low. The increase of the MAO concentration in the reaction mixture causes a large increase in the isobutylene conversion, although the molecular weight of the polymers sharply decreases. The use of CD2Cl2 as a solvent induces a large kinetic isotope effect (KIE=7). In the copolymerization of isobutylene with large amounts of isoprene a cross-linkage copolymer is formed. The polymerization and copolymerization reactions were also studied in the presence of a mixture of MAO with the complex (acac)2TiCl 2 (acac=acetylacetonate).

Original languageEnglish
Pages (from-to)243-252
Number of pages10
JournalInorganica Chimica Acta
Volume334
DOIs
StatePublished - 30 May 2002
Externally publishedYes

Keywords

  • Copolymerization
  • Isobutylene
  • Isoprene
  • Methylalumoxane
  • Polymerization

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