Peer-Reviewed Journal Details
Mandatory Fields
Padraig O'Connor, Rongbing Yang, Wiliiam M. Carroll, Yuri Rochev, Fawaz Aldabbagh
2012
July
European Polymer Journal
Facile synthesis of thermoresponsive block copolymers of N-isopropylacrylamide using heterogeneous controlled/living nitroxide-mediated polymerizations in supercritical carbon dioxide
Published
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Optional Fields
Macroinitiator Radical Polymer Precipitation polymerisation Reversible-deactivation Suspension polymerisation TRANSFER RADICAL POLYMERIZATION FRAGMENTATION CHAIN TRANSFER TRANSFER RAFT POLYMERIZATION CONTROLLED DISPERSION POLYMERIZATION METHYL-METHACRYLATE PRECIPITATION POLYMERIZATION MOLECULAR-WEIGHT ANIONIC-POLYMERIZATION TERT-BUTYLACRYLAMIDE VINYL MONOMERS
48
1279
1288
A new protocol for preparation of thermoresponsive poly(N-isopropylacrylamide, NIPAM) containing block copolymers is described. It involves two successive heterogeneous controlled/living nitroxide-mediated polymerizations (NMPs) in supercritical carbon dioxide (scCO(2)) using N-tert-butyl-N-[1-diethylphosphono-(2,2-dimethylpropyl)]nitroxide (SG1), as the nitroxide. Precipitation NMPs give narrow dispersity macroinitiators (MIs), and a first report of the controlled/living polymerization of N,N-dimethylacrylamide (DMA) in scCO(2) is described. The MI is then used in an inverse suspension NMP of NIPAM in scCO(2) resulting in the efficient preparation of block copolymers containing DMA, tert-butyl acrylate and styrene. Aqueous cloud point temperature analysis for poly(DMA)-b-poly(NIPAM) and poly(acrylic acid)-b-poly(NIPAM) shows a significant dependence on poly(NIPAM) chain length for a given AB block copolymer. (C) 2012 Elsevier Ltd. All rights reserved.
http://www.sciencedirect.com/science/article/pii/S0014305712001267
DOI 10.1016/j.eurpolymj.2012.04.011
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