Abstract
AbstractPreviously reported results related glass transition temperature to structure in two systematic series of poly(carborane–siloxane)s using a well‐known copolymer composition–glass transition relationship 1/Tg = W1/Tg1 + W2/Tg2. The relationship was originally proposed to apply not only to copolymers, but also to diluent systems. Accordingly, mixtures of polymers within each series were prepared and the thermomechanical spectra were determined by the technique of torsional braid analysis. The binary mixtures included poly(dimethylsiloxane) with polymers in both series and a mixture of two CB10H10C siloxane polymers. In all cases, the thermomechanical spectra revealed only those transition regions characteristic of the individual components. This type of behavior is indicative of phase separation of incompatible polymeric species.
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