THERMOTROPIC LIQUID CRYSTAL SEGMENTED BLOCK COPOLYMER

摘要

2113113 9301227 PCTABS00019 Novel segmented block copolymers comprising mesogenic (or ''rod'') blocks and flexible coil polymer blocks are disclosed which can be blended with a substantially similar flexible coil polymer matrix to improve the mechanical properties of the flexible coil matrix. For example, blends of poly(butylene terephthalate) (PBT) with a liquid crystalline block copolymer, poly(tetramethylene 4,4'-terephthaloyl-dioxydibenzoate)-b-poly(butylene terephthalate) (LCP-b-PBT) were prepared by precipitation from a common solvent, dried, and melt extruded through a capillary die to produce a monofilament. In all blends, the LCP-b-PBT domains were less than 0.1 .mu.m in size and ultrafinely and uniformly dispersed. Even though the blends were only moderatly elongated into fibrils, interfacial adhesion between the LCP-b-PBT and the pure PBT appeared excellent. The fibers generally have shown that tensile strength and modulus are enhanced with increasing draw ratio, LCP-b-PBT content and processing temperature.