Living Carbocationic Polymerization. 48. Poly (isobutylene-b-methyl vinyl ether

Joseph P. Kennedy, Tibor Pernecker, Béla Iván

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The synthesis of poly(isobutylene-b-methyl vinyl ether) (PIB-b-PMeVE) by living carbocationic polymerization (LC+Pzn) employing the sequential monomer addition (SMA) technique is described. The process starts by producing the living PIB+ block employing the 2-chloro-2,4,4-trimethylpentane (TMPCl)/TiCl4 initiating system in the presence of the common ion salt tetra-n-butylammonium chloride (nBu4NCl) in CH3Cl/n-C6H14 or CH2Cl2/n-C6H14 mixed solvents at -80 °C and continues by the addition of methyl vinyl ether (MeVE). The second living block forms only in the presence of excess TiCl4, suggesting that the species that starts the second block and subsequently sustains its growth is a MeVE-TiCl4 complex. The stoichiometry of this complex (1:1 or 1:2) is uncertain. The TiCl4 remains attached to the MeVE units after their incorporation into the diblock; however, it can be readily removed by water. PMeVE obtained in the presence of excess TiCl4 degrades by dealcoholation; however, degradation is prevented by the use of nBu4NCl. Various length (composition) diblocks have been prepared and characterized. The novel PIB-b-PM VEs exhibit strongly amphiphilic character.

Original languageEnglish
Pages (from-to)1642-1647
Number of pages6
JournalMacromolecules
Volume25
Issue number6
DOIs
Publication statusPublished - Nov 1 1992

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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