THE EFFECT OF FIBROUS FILLER ON THE RHEOL OGICAL AND MECHANICAL-PROPERTIES OF THE BLENDS OF POLYSULFONE WITH A LIQUID-CRYSTALLINE COPOLYESTER

Rheological properties of the blends of polysulfone with an LC copolye ster were studied both in the absence or presence of short glass fiber s. Plots of viscosity of the melts of binary blends versus blend compo sition showed a positive deviation from the additivity pattern at a lo w content of the copolyester; the deviation was negative at high conte nts of the copolyester. Filling the blend with glass fiber to a 20% co ntent reduced the amplitude of deviations, that is, the glass fiber di d not enhance the interfacial interaction between the components. Intr oduction of glass fiber reinforced the copolyester, whereas the mechan ical properties of polysulfone were almost independent of the content of the glass fiber, When blended matrices were used, the reinforcement was observed in a narrow range of glass fiber contents (5-7%) and the extent of reinforcement was greater for matrices in which the copolye ster was the dispersion medium.