MORPHOLOGY AND MECHANICAL-PROPERTIES OF POLY(ETHYLENE TEREPHTHALATE)-POLY(HYDROXYBENZOIC ACID) AND POLYCARBONATE BLENDS

Blends of an engineering plastic; polycarbonate (PC) and a liquid crystalline polymer; random copolymers of the poly(ethylene terephthalate) and the poly(hydroxybenzoic acid) were prepared in an internal mixer. Fibers were extruded from the capillary rheometer and spin-drawn at varying draw ratios. The morphology and the mechanical properties were investigated by DSC, SEM, polarizing optical microscopy, X-ray diffraction, and tensile tests. SEM studies revealed that the liquid crystalline polymer (LCP) formed finely dispersed spherical domains with a diameter of 0. 2-2. 0 micron in the PC matrix and the inclusions were deformed from the spherical droplets to fibrils as the draw ratio increased.