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Multidimensionally stimuli‐responsive phase transition of aqueous solutions of poly(( N,N ‐dimethylamino)ethyl methacrylate) and poly( N,N ‐dimethyl‐ N ‐(methacryloyl)ethyl ammonium butane sulfonate)
Author(s) -
Gao Jun,
Zhai Guangqun,
Song Yan,
Jiang Bibiao
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26683
Subject(s) - polyelectrolyte , methacrylate , polymer chemistry , sulfonate , aqueous solution , butane , copolymer , ionic strength , polymer , radical polymerization , phase (matter) , dissolution , phase transition , chemistry , glass transition , materials science , organic chemistry , catalysis , sodium , physics , quantum mechanics
Free radical polymerization of N,N ‐(dimethylamino)ethyl methacrylate and N,N ‐dimethyl‐ N ‐(methacryloyloxy)ethyl ammonium butane sulfonate was carried out to prepare PDMAEMA and PDMABS. Proton nuclear magnetic resonance spectroscopy indicated that both PDMAEMA and PDMABS exhibited an electrolyte‐responsive conformational dynamics in D 2 O of different ionic strength. PDMAEMA, as a polybase, and PDMABS, as a polysulfobetaine, exhibited a series of multidimensional stimuli‐responsive phase transition behaviors. Adding NaCl would decrease the phase transition temperature ( T PT ) of their aqueous mixtures, because of polyelectrolyte effect for PDMAEMA and anti‐polyelectrolyte effect for PDMABS, respectively. For PDMAEMA, a low pH would facilitate the dissolution; on the other hand, for PDMABS, a maximum T PT was achieved in neutral media. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008
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