Entropy, glass transition temperature Gibbs-DiMarzio theory

Another interesting aspect of the Gibbs-DiMarzio " " theory is that it predicts an effect of deformation on the glass transition temperature due to changes in the entropy of the system upon straining the network. For uniaxial extension, the result in terms of the small-strain modulus G, measured at a temperature Tq, is ... 

The entropy theory of the glass transition was developed by Gibbs and DiMarzio and by Adams and Gibbs to describe polymeric systems. By mixing the polymer links with holes or missing sites on a lattice to account for thermal expansion as in a lattice gas model, they could determine the entropy of mixing and the configurational entropy of the polymer. They found a second-order transition at a temperature They then pointed... 

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