N-ALKOXY-PYRIDINIUM AND N-ALKOXY-QUINOLINIUM SALTS AS INITIATORS FOR CATIONIC PHOTOPOLYMERIZATIONS


YAGCI Y. , KORNOWSKI A., SCHNABEL W.

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol.30, no.9, pp.1987-1991, 1992 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 9
  • Publication Date: 1992
  • Doi Number: 10.1002/pola.1992.080300922
  • Title of Journal : JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
  • Page Numbers: pp.1987-1991

Abstract

The polymerization of n-butyl vinyl ether (BVE), cyclohexene oxide (CHO) and 3,4-epoxycyclohexyl (methyl) -3',4'-epoxycyclohexane carboxylate (EEC) was initiated upon UV irradiation (lambda(inc) > 300 nm) of dichloromethane solutions containing N-ethoxy-2-methylpyridinium (V), N-ethoxy-4-phenyl-pyridinium (VI), or N-ethoxy-isoquinolinium hexafluorophosphate (VII). Whereas the bifunctional EEC was converted into an insoluble gel, BVE and CHO formed polymers of molar mass: M(w) = 2 X 10(4)-2 X 10(5) (PCHO) and M(w) almost-equal-to 2 X 10(4) (PBVE). Protons are formed with a rather high quantum yield [phi(H+) = 0.48 on irradiating VII in dichloromethane; titration with sodium p -nitrophenolate ] and it is, therefore, assumed that the polymerization is initiated by photochemically generated protons.