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


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

POLYMER, cilt.40, ss.3885-3890, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 40 Konu: 13
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1016/s0032-3861(98)00633-8
  • Dergi Adı: POLYMER
  • Sayfa Sayıları: ss.3885-3890

Özet

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.