The micellization and gelation properties of oxyethylene/oxybutylene diblock copolymers E 40 B 10 and E 41 B 8 in aqueous K 2 SO 4 solutions were investigated. The thermodynamic and hydrodynamic volumes of the micelles in salt solutions of various concentrations up to 0.4 mol dm −3 were determined by static and dynamic light scattering, respectively. The related changes in the gelation behavior of concentrated micellar solutions of the copolymers were explained as thermodynamic (excluded) volume effects. The thermodynamic volumes of micelles measured in moderately concentrated solution were used successfully to predict the critical gel concentrations of concentrated solutions.
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Deng et al. (1995) studied this question.
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