Blends of two thermotropic liquid crystalline polymers: The influence of reactions during injection molding on the phase structure and the mechanicalbehavior

Blends of two different thermotropic liquid crystalline polymers, poly(p-hy droxy benzoic acid-co-2, 6-hydroxy naphthoic acid), VA, and poly(p-hydroxyb enzoic acidco-terephthalic acid-co-aminophenol), VB, were obtained by direc t injection molding throughout the full composition range. The blends were almost fully immiscible apart from a low degree of reaction. This, as well as the nature of the blends, probably influenced their mechanical propertie s. Enhanced properties were obtained both in the modulus of elasticity and in the tensile strength, at all the compositions studied, with absolute max ima at VB contents between 50% and 75%. These synergisms were mainly due to a greater orientation of the components in the blends than in the pure com ponents.