Morphology Control and Mechanical Properties of Liquid Crystalline Polymer-Polyamide Composite Fibers

摘要

In this paper, we investigate the relationships between the viscosity ratio, morphology, and procesisng temperature of composite fibers comprising liquid crystalline polyme (LCP) and polyamide -66 (PA 66). Furthermore, we examine in detials the effect of the LCP concentration on the phase microstructure and the mechanical properties of the composite fibers. The results show that, first, the optimal processing temperature of melt spinnng of the composite fibers depends strongly on the viscosity ratio of LCP to PA 66 though the processing temperature range can be determined by the degrdation temperature by the PA 66 and the melting point of LCP. Secondly, the LCP phase strucutre/morphology in composite fibers can be controlled by the viscosity ratio of LCP to PA 66. Thirdly, the LCP phase structure/morphology are changed with LCP concentration for a fixed viscosity ratio/processing temperature. With an increase in LCP concentration, the morphology LCP phase is changed from a fine fibril dispersed phase to a perfectly aligned continuous fiber reinforced phase in a rich LCP composite fiber. Finally, the mechanical properties of LCP composite fibers depend on the LCP phase structure/morphology and LCP concentration. The tensile properties of the composite fibers exhibit the positive synergy in the rich LCP composite fibers.