PHOTOSENSITIZED CATIONIC POLYMERIZATION USING N-ETHOXY-2-METHYLPYRIDINIUM HEXAFLUOROPHOSPHATE


YAGCI Y. , LUKAC I., SCHNABEL W.

POLYMER, vol.34, no.6, pp.1130-1133, 1993 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 6
  • Publication Date: 1993
  • Doi Number: 10.1016/0032-3861(93)90762-y
  • Title of Journal : POLYMER
  • Page Numbers: pp.1130-1133

Abstract

The cationic polymerization of cyclohexene oxide is initiated at room temperature upon irradiation at lambda(inc) > 350 nm of CH2Cl2 solutions containing N-ethoxy-2-methylpyridinium hexafluorophosphate (EMP+PF6-) and one of the following compounds: thioxanthone, anthracene, perylene or phenothiazine. Poly(cyclohexene oxide) of molar mass exceeding 10(5) is produced. In the absence of EMP+PF6-, which is transparent at lambda(inc) > 350 nm, these sensitizers are ineffective. Acetophenone and benzophenone do not act as sensitizers. An initiation mechanism involving electron transfer from the excited sensitizers to EMP+ ions is proposed. In flash photolysis experiments, electron transfer was evidenced by the formation of radical cations in the cases of anthracene, perylene or phenothiazine.