The glass transition of compatible blends

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Abstract
In a thermodynamic model of the glass transition, general but circular relations for the compositional variation of the glass‐transition temperature, Tg, can be derived from the entropy, the volume, and the enthalpy. The circumstances necessary for each of these to reduce to predictive relations are stated. Of these relations, that derived from the entropy should be the most general because of the expected rather wide applicability of the random mixing assumption, with which it is associated. The entropic theory is used to account for several aspects of the compositional variation of Tg, including problems not of solutions per se.