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A Very Useful Redox Initiator for Aqueous RAFT Polymerization of N ‐Isopropylacrylamide and Acrylamide at Room Temperature
Author(s) -
Bai Wei,
Zhang Liang,
Bai Ruke,
Zhang Guangzhao
Publication year - 2008
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700823
Subject(s) - chain transfer , polymerization , raft , polymer chemistry , potassium persulfate , reversible addition−fragmentation chain transfer polymerization , chemistry , monomer , aqueous solution , poly(n isopropylacrylamide) , acrylamide , persulfate , redox , radical polymerization , polymer , copolymer , inorganic chemistry , organic chemistry , catalysis
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] 0 /[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.