We propose a Ginzburg-Landau-type model to describe the kinetics of mixtures undergoing a sol-gel transition (nonconserved order parameter) simultaneously with phase separation (conserved order parameter). We compute the temporal development of the structure factor and determine the wave vector qₘₐₓ at which the structure factor is maximal. We find that after a certain time tf, qₘₐₓ saturates at a final value qf, and we calculate the temperature dependence of both tf and qf. The predictions of this zeroth-order model agree remarkably well with recent kinetic measurements in gelatin-water-methanol mixtures.
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Sciortino et al. (1993) studied this question.
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