SEGMENTED LIQUID-CRYSTALLINE COPOLYESTERS AND BLENDING WITH POLY(ETHYLENE-TEREPHTHALATE)

A series of segmented copolyesters with semi-regular structure was syn thesized. In these copolymers, fully aromatic triad hard segments -HB- T-HB-, acting as mesogenic units, are linked each other by poly(ethyle ne terephthalate) (PET) segments with different average chain lengths as flexible spacers. The liquid crystallinity of the copolymers, i.e. the meso-phase forming ability, was studied against length of the spac er. In subsequent blending of these copolymers with PET matrix, result s were compared with those from a commercial TLCP of PHB/PET random co polyester. Better mechanical properties were gained as expected since the compatibility of the segmented liquid crystalline copolyesters wit h the matrix is believed to be improved.