Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 29, Issue 7, Pages 562-566Publisher
WILEY-BLACKWELL
DOI: 10.1002/marc.200700823
Keywords
activation energy; reversible addition fragmentation chain transfer (RAFT); redox initiator; room temperature; water-soluble polymers
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Reversible addition fragmentation chain transfer (RAFT) polymerizations of N-isopropylacrylamide (NIPAM), and acrylamide (AM) were successfully performed in aqueous media at ambient temperature using a redox initiator, potassium persulfate (K(2)S(2)O(8)), and sodium thiosulfate (Na(2)S(2)O(3)). The molecular weight of the polymers obtained increases linearly with monomer conversion, molecular weight distribution is narrow even at high conversion (>90%), and a linear relationship exists between ln([M]o/[M]) and polymerization time. Moreover, self-chain extension reaction also proceeded successfully. All the results demonstrate that K(2)S(2)O(8)-Na(2)S(2)O(3) is a very efficient initiating system for the RAFT polymerizations of NIPAM. and AM in aqueous media at room temperature.
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