Characterization and Processing of Blends of Polyethylene Terephthalate with Several Liquid Crystalline Polymers.

摘要

This paper is concerned with blending thermotropic copolyesters with polyethyleneterephthalate (PET) in an effort to reinforce PET and thereby improve its modulus. The sucess of the technique rests on the viscosity of the liquid crystalline polymer (LCP) being lower than that of PET over the processing temperature range. In cases where the LCP was too miscible with PET the processing window for forming fibril reinforcement was too narrow and the LCP became dispersed. The modulus of drawn films was increased by a factor of 4 with the presence of a copolyester consisting of 70 mole % Parahydroxybenzoic acid/30 mole % PET. Keywords: In-situ thermoplastic composites; Liquid crystalline polymers; Blends; Self-reinforced films; PET; Fibers; Copolyesters. (JG)