Second-order transition Gibbs-DiMarzio theory

However, if the Tg is explained according to the Gibbs-DiMarzio second-order transition theory, it may be expected that not only the... 

Gibbs and DiMarzio (34, 33) developed a theory for a second order transition in polymers based on the quasi-lattice theory and taking into... 

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... 

Figure 5.20 Entropy (5) as a function of temperature (T) and pressure (P) according to the Gibbs-DiMarzio theory. The second-order transition (denoted T2 by the authors) is marked with a thick line. Drawn after DiMarzio (1981).

We have replaced the idea of second order phase transition postulated by the Gibbs-DiMarzio theory, yet retained its successful features. Tr is treated as the thermodynamic anomaly at which the most stable hole configuration is reached under the close packing of holes and flex bonds. 

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