Synthesis of a novel addition-fragmentation agent based on Michler's ketone and its use as photo-initiator for cationic polymerization


ONEN A., Yagci Y.

POLYMER, cilt.42, ss.6681-6685, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 42 Konu: 16
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1016/s0032-3861(01)00162-8
  • Dergi Adı: POLYMER
  • Sayfa Sayıları: ss.6681-6685

Özet

A novel addition-fragmentation agent (AFA), 4,4/-bis(N,N,dimethyl, N (2-ethoxy carbonyl-1-propenyl) ammonium hexafluoro antimonate)benzophenone (MKEA) as a photo-initiator for cationic polymerization was synthesized from the precursor Michler's ketone (MK) and characterized. MKEA initiates cationic photo-polymerization of cyclic ethers like cyclohexene oxide (CHO) via conventional addition fragmentation mechanism. Unlike the previously reported AFAs, this initiator does not require supplementary free radical sources. Poly merizations and spectroscopic investigations were performed to help understand the mechanism, with results suggesting that radicals steming from the photo-induced hydrogen abstraction participate addition fragmentation reactions to yield reactive species capable of initiating cationic polymerization. Photo-induced polymerizations of vinyl monomers such as butyl vinylether, isobutyl vinylether and N-vinylcarbazole and a bisepoxide such as 3',4'-epoxycyclohexyl-3',4'-epoxycyclohexene carboxylate by using MKEA were also achieved. (C) 2001 Elsevier Science Ltd. All rights reserved.