Gibbs-Di Marzio Thermodynamic Theory

As the temperature drops toward Tj, the number of available configurational states in the system decreases, until at the temperature Tj, the system possesses only one degree of freedom. This leads to 

The fractions of unoccupied and occupied sites are/g and fl, respectively, whereas is a function of/g,/, and z. The main weaknesses of this theory are (1) that a chain of zero stiffness would have a 7g of 0 K and (2) that the would be essentially 

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