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Study of the orientation of poly(styrene)/poly(vinyl methyl ether) blends relative to the glass transition temperature

Molecular orientation and mechanical properties of poly(styrene)/poly(vinyl methyl ether) (PS/PVME) miscible blends are studied, in a broad range of compositions, taking as a reference the T g . The PS orientation is directly measured using FTIR spectroscopy, whereas the orientation of PVME is characterized by coupling FTIR and birefringence techniques. It is observed that the overall and individual orientations, as well as Young's modulus of the blends, remain constant up to 30% PVME. Above this concentration, these properties are found to be strongly composition-dependent and to increase at the 50% PVME composition by a factor of 6 (PS orientation), 4 (overall birefringence) and 10 (modulus) as compared to the corresponding values below 30%