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Synthesis of Thermo‐Responsive Polymers With Both Tunable UCST and LCST
Author(s) -
Tian HaiYing,
Yan JunJie,
Wang Di,
Gu Chen,
You YeZi,
Chen XueSi
Publication year - 2011
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.201000713
Subject(s) - lower critical solution temperature , upper critical solution temperature , methacrylamide , polymer chemistry , copolymer , methacrylate , chemistry , ethylene glycol , sulfonate , chain transfer , polymer , materials science , radical polymerization , organic chemistry , acrylamide , sodium
New water‐soluble block copolymers of 2‐(2‐methoxyethoxy)ethyl methacrylate (MEO 2 MA), oligo(ethylene glycol) methacrylate (OEGMA), and N ‐(3‐(dimethylamino) propyl) methacrylamide (DMAPMA) (poly(OEGMA‐ co ‐MEO 2 MA)‐ b ‐poly(DMAPMA)) were prepared via sequential reversible addition‐fragmentation chain transfer (RAFT) polymerization. Selective quaternization of poly(DMAPMA) block gives poly(OEGMA‐ co ‐MEO 2 MA)‐ b ‐poly((3‐[ N ‐(3‐methacrylamidopropyl)‐ N , N ‐dimethyl]ammoniopropane sulfonate)‐ co ‐ N ‐(3‐(dimethylamino) propyl) methacrylamide), such block copolymer exhibits double thermo‐responsive behavior in water, poly(MEO 2 MA‐ co ‐OEGMA) block shows a lower critical solution temperature (LCST), and poly((3‐[ N ‐(3‐methacrylamidopropyl)‐ N , N ‐dimethyl]ammoniopropane sulfonate)‐co‐ N ‐(3‐(dimethylamino) propyl) methacrylamide) block shows a upper critical solution temperature (UCST). Both of LCST and UCST can be controlled: LCST could be tuned by the fraction of OEGMA units in poly(OEGMA‐ co ‐MEO 2 MA), and UCST was found to be dependent on the degree of quaternization (DQ).