RAFT-mediated polymerization and grafting of sodium 4-styrenesulfonate from cellulose initiated via gamma-radiation


BARSBAY M. , GUEVEN O., DAVIS T. P. , BARNER-KOWOLLIK C., BARNER L.

POLYMER, cilt.50, sa.4, ss.973-982, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 50 Konu: 4
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.polymer.2008.12.027
  • Dergi Adı: POLYMER
  • Sayfa Sayıları: ss.973-982

Özet

Ambient temperature (20 degrees C) reversible addition fragmentation chain transfer (RAFT) polymerization of sodium 4-styrenesulftonate (SS) conducted directly in aqueous media under gamma-irradiation at different dose rates (0.09, 0.03 and 0.02 kGy h(-1)) proceeds in a controlled fashion (typically, M-w/M-n < 1.25) to near quantitative conversions via 4-cyanopentanoic acid dithiobenzoate (CPADB) mediation. By applying CPADB modified cellulose as a macro chain transfer agent, a graft copolymer with SS was prepared in aqueous media under gamma-irradiation. RAFT mediated graft polymerizations provided copolymers with higher graft frequencies compared to those obtained by conventional methods. Thermally initiated grafting of SS from a CPADB-functionalized cellulose surface at 70 degrees C was also studied which resulted in a reduced graft frequency in comparison to gamma-initiated ones. (C) 2008 Elsevier Ltd. All rights reserved.