Journal
POLYMER
Volume 50, Issue 4, Pages 973-982Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2008.12.027
Keywords
Cellulose; Grafting; Gamma-irradiation
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Funding
- Australian Government Department of Education, Science and Training (DEST)
- Academy of Sciences of Turkey
- University of New South Wales
- Australian Research Council (ARC)
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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.
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