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Effects of Temperature and Surfactants on the Equilibrium Swelling Behavior of Poly[acrylamide‐ co ‐(itaconic acid)] Hydrogels

2004; Wiley; Volume: 289; Issue: 6 Linguagem: Inglês

10.1002/mame.200400037

1439-2054

Tuncer Çaykara, Melike Doğmuş,

Advanced Polymer Synthesis and Characterization

Abstract Summary: The swelling equilibrium of poly(acrylamide) [PAAm] and poly[acrylamide‐ co ‐(itaconic acid)] [P(AAm/IA)] hydrogels was studied as a function of temperature and IA content in aqueous solutions of surfactants: sodium dodecyl sulfate (SDS, anionic) and hexadecyltrimethylammonium bromide (HTAB, cationic). P(AAm/IA) hydrogels in water exhibited reentrant conformational transitions depending on temperature, whereas PAAm hydrogels were not affected with the change of temperature. The equilibrium‐volume‐swelling ratio of P(AAm/IA) hydrogels increased sharply in SDS solutions, with an increase of the mole percent of IA. However, in HTAB solution, the equilibrium‐volume‐swelling ratio of these hydrogels decreased with an increase of IA content. The equilibrium volume‐swelling ratios of the hydrogels in water shown as a function of temperature. magnified image The equilibrium volume‐swelling ratios of the hydrogels in water shown as a function of temperature.