Title of article :
Facile synthesis of thermoresponsive block copolymers of N-isopropylacrylamide using heterogeneous controlled/living nitroxide-mediated polymerizations in supercritical carbon dioxide
Author/Authors :
Padraig O’Connor، نويسنده , , Rongbing Yang، نويسنده , , William M. Carroll، نويسنده , , Yury Rochev، نويسنده , , Fawaz Aldabbagh، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Abstract :
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 (scCO2) 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 scCO2 is described. The MI is then used in an inverse suspension NMP of NIPAM in scCO2 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.
Keywords :
Macroinitiator , radical , Polymer , Precipitation polymerisation , Reversible-deactivation , Suspension polymerisation
Journal title :
European Polymer Journal(EPJ)
Journal title :
European Polymer Journal(EPJ)