THERMAL-PROPERTIES OF BLENDS OF POLY(ETHYLENE-TEREPHTHALATE) AND A LIQUID-CRYSTALLINE COPOLYESTER

A thermotropic liquid crystal copolyester (CHQ/BP/TA/IA; 40/10/40/10) (LCP), and melt blends of poly(ethylene terephthalate) (PET) with LCP have been studied for thermal transition and crystallization behaviour. The LCP has a mesophase transition (K --> M) in the temperature range of 295-315-degrees-C. The endothermic peak showing mesophase to Isotropic (M --> I) transition is observed around 420-degrees-C. These transitions are supported by hot stage polarizing microscopy. In blends of PET/LCP, the mesomorphic transition is observed at temperature around 314-degrees-C, along with the melting transition of PET around 274-degrees-C. The dynamic calorimetric measurements reveal that the two polymers are at least partially miscible.