The glass transition temperatures Tg of homogeneous binary blends of the homo‐ and the statistical copolymers of the system poly(styrene‐co‐methyl methacrylate) were studied. Some of the blends, which are in the equilibrium phase separated, were forced into homogeneity. Tg (ϕ) of the homopolymer blends (PS/PMMA)ϕ follows the Fox equation, while Tg (x) of the pure copolymers P(SxMMA1 − x) exhibits a minimum. This minimum can be effectively removed by blending the copolymers with small fractions (ϕ ≈ 0,2) of one of the two homopolymers or a differently composed copolymer P(SyMMA1 − y).
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Braun et al. (1988) studied this question.
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