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, vol.50, no.4, pp.973-982, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 4
  • Publication Date: 2009
  • Doi Number: 10.1016/j.polymer.2008.12.027
  • Journal Name: POLYMER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.973-982
  • Keywords: Cellulose, Grafting, Gamma-irradiation, FRAGMENTATION CHAIN-TRANSFER, FREE-RADICAL POLYMERIZATION, SULFONATED POLYSTYRENE RESINS, WATER-SOLUBLE (CO)POLYMERS, AMBIENT-TEMPERATURE, COMPOSITE-MATERIALS, BLOCK-COPOLYMERS, CONSTANT SOURCE, TRANSFER AGENTS, LEAVING GROUPS
  • Hacettepe University Affiliated: Yes

Abstract

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.