Abstract
Amphoteric diblock copolymers (S10Vn, n = 5, 10, and 20) composed of anionic poly(sodium p-styrenesulfonate) and cationic poly(vinylbenzyl trimethylammonium chloride) blocks were prepared via a controlled radical polymerization method. S10V10 was insoluble in pure water owing to its electrostatic interactions, but S10V5 and S10V20 were soluble in pure water. S10V5 and S10V10 exhibited upper critical solution temperature behaviors, and the transition temperature decreased with increasing sodium chloride concentration.
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