The elastic continuum model adequately describes the properties of gelatin gels, with crosslinking agents causing continuous increases in decay rate and shortening of spatial correlation length over time.
Supports elastic continuum model for gelatin gels; leaves open generalization to other polymer systems.
Gels formed from very polydispersive gelatin solutions were studied by intensity fluctuation spectroscopy. Single exponential autocorrelation functions were obtained for gelatin gels with and without a crosslinking agent. The elastic continuum model was found to adequately describe all the observed properties. As the concentration increases the cooperative diffusion coefficient Dc of the polymer network decreases in the solution state, but increases in the gel state. For gels without a crosslinking agent, the decay rate of the correlation function was found to remain constant after it reached a terminal value several hours after its temperature was lowered to 20 °C. However, for gels with a crosslinking agent, the decay rate continuously increased and the spatial correlation length became shorter with time.
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Hwang et al. (1983) studied this question.
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