Thermotropic liquid crystal segmented block copolymer

Details Thermotropic liquid crystal segmented block copolymer Thermotropic liquid crystal segmented block copolymer

C - Chemistry, Metallurgy

08

G

C08G 81/00 (2006.01) C08G 63/181 (2006.01) C08G 63/60 (2006.01) C08L 67/02 (2006.01) C09K 19/38 (2006.01)

Patent

CA 2113113

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 µm 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.

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