Synthesis of block copolymers by transformation of photosensitized cationic polymerization to stable free radical polymerization


YILDIRIM T. , HEPUZER Y., HIZAL G. , Yagci Y.

POLYMER, vol.40, no.13, pp.3885-3890, 1999 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 13
  • Publication Date: 1999
  • Doi Number: 10.1016/s0032-3861(98)00633-8
  • Title of Journal : POLYMER
  • Page Numbers: pp.3885-3890

Abstract

Anthraccne-photosensitized cationic polymerization of cyclohexene oxide at lambda=350 nm in conjuction with onium salts, namely N-ethoxy-2-methyl pyridinium hexafluorophosphate (EMP+PF6-) or diphenyliodonium hexafluorophosphate (Ph(2)l(+)PF(6)(-)), in the presence of a stable radical, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), yielded polymers with alkoxyamine terminal groups, These polymers were found to be efficient initiators for stable free radical polymerization (SFRP) of styrene. LR, H-1-NMR spectral analysis and GPC studies of the obtained polymers show that block copolymers are readily formed as a result of combination of photosensitized cationic and stable free radical polymerization mechanisms. (C) 1999 Elsevier Science Ltd. All rights reserved.