Inhomogeneities and deviations from the Gaussian photoelastic behavior of networks

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Abstract
The microphase separation of the swelling agent in swollen gels due to a change in temperature leads to an increase in deviations of the photoelastic behavior from the theory of Gaussian networks. These departures are reflected in an increase in the parameter C2 of the Mooney-Rivlin equation, particularly in a pronounced increase in the stress-optical coefficient Ce and in its marked dependence on deformation. While the mechanical behavior is affected in a decisive manner by the swollen gel matrix, optical characteristics are mainly influenced by particles of the excluded liquid phase.