Effect of ionogenic groups on the collapse of thermosensitive gels

The effect of the different kinds of ionogenic groups of copolymers of N-isopropylacrylamide with sodium methacrylate, sodium vinylsulfonate, and diallyldimethylammonium chloride on the temperature-induced conformation transition from a swollen gel to a collapsed gel is studied. The presence of different kinds of ionogenic groups in a thermosensitive copolymer is shown to affect the temperature, collapse amplitude, and reversibility of the transition between the swollen gel and the collapsed gel.