Dependence of the Glass Transition Temperature on the Composition of Elastomer Mixtures

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Abstract
The dependence of the glass transition temperature on the composition of some compatible, partially compatible, and incompatible elastomer mixtures have been investigated by means of the radiothermoluminescence method. It has been established that the glass temperature of a homogeneous mixture of two elastomers, Tgm, is related to the glass temperature of these elastomers, Tg1 and Tg2, by Tgm=Tg2−(Tg2−Tg1)⋅W1c, where C is lower than unity for each investigated mixture. Incompatible mixtures are characterized by two glass temperatures practically equal (to within 0.5° C) to that of initial components in a rather wide range of concentrations. Two Tg's are also characteristic of partially compatible systems though their values are different from those of the individual components.

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