A new synthetic method for the preparation of star-shaped polyisobutylene with hyperbranched polystyrene core

Gergely Kali, Márta Szesztay, Andrea Bodor, Béla Iván

Research output: Contribution to journalArticle

14 Citations (Scopus)


Friedel-Crafts self-grafting of polystyrene (PSt) under quasiliving carbocationic polymerization was utilized to develop a new rapid one-pot method for the preparation of star-shaped polyisobutylene (PIB). First, the polymerization of isobutylene led to PIB with predetermined molecular weight (M̄n = 2 000) and narrow molecular weight distribution (M̄w/M̄n = 1.03). Then addition of relatively small amount of styrene after isobutylene consumption yielded PIB-PSt diblocks. Multiple alkylation of the resulting PSt segments by the polystyryl cations led to hyperbranched PSt cores coupling PIB chains to form a star polymer in short reaction time (within an hour) compared to reported methods. The formation of star polymers by this self-grafting mechanism was proved by gel permeation chromatography equipped with online viscosimeter and 1H NMR spectroscopy.

Original languageEnglish
Pages (from-to)1388-1393
Number of pages6
JournalMacromolecular Chemistry and Physics
Issue number13
Publication statusPublished - Jul 3 2007



  • Ab block copolymer
  • Friedel-crafts self-alkylation
  • Polyisobutylene
  • Polystyrene
  • Quasi-living carbocationic polymerization
  • Star polymers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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