V. Hildebrand, A. Laschewsky, M. Päch, P. Müller-Buschbaum, C. M. Papadakis
Effect of the Zwitterion Structure on the Thermo-responsive Behaviour of Poly(Sulfobetaine Methacrylate)s
Polym. Chem. 2017, 8, 310-322
DOI: 10.1039/c6py01220e
A series of zwitterionic poly(sulfobetaine methacrylate)s was synthesized by RAFT (reversible addition-fragmentation chain transfer) polymerization. The chemical structure of the well-defined polyzwitterions was varied systematically, to elucidate the influences of the various substituents and substitution patterns on their thermoresponsive behavior in aqueous solutions. While all polymers exhibit upper critical solution temperatures (UCSTs), small changes of the chemical structure result in big changes of the transition temperature. Additionally, the phase behavior depends sensitively and in a complex way on the amount and type of salt(s) added, and moreover, shows marked H-D isotope effects in H2O/D2O.
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