BLENDED IN-SITU COMPOSITES BASED ON POLYA MIDE AND A LIQUID-CRYSTALLINE COPOLYESTER

Rheological and mechanical properties of the blends of polyamide the 6 6 and LC copolymer of hydroxybenzoic acid and PET were investigated. V ariation of the properties that results from high-temperature annealin g of the blends was studied by viscometry of dilute polymer solutions, DSC, and IR spectroscopy, The addition of even small amounts of the c opolymer was shown to give rise to a considerable decrease, by a facto r of 10-12, in viscosity of the blends and to a certain enhancement of the strength, by 20%, as compared to the corresponding characteristic s of the polyamide. Variation of the properties during long-term annea ling of the blends evidences that transesterification and transamidina tion take place at the interface between the polyamide and the copolym er.