繊維複合液晶性高分子の射出成形における流動配向

抄録

An experimental study of the morphology and orientation of injection molded LCP and fiber/LCP composites was carried out. The LCP studied was a completely aromatic copolyester composed of 4-hydroxy-benzoic acid (HBA) and 2-hydroxy-6-naphtoic acid (HNA). The fibers were potassium titanate single crystal. The morphology and orientation of the samples were characterized by polarized optical microscopy, scanning electron microscopy, scanning acoustic microscopy, and wide angle x-ray diffraction. Four layers with different morphologies were observed along the thickness direction in molded samples of LCP and fiber/LCP composites. The crystallinity of each layer increased with increasing distance from the surface. The molecular orientation of the three outher layers was parallel to the flow direction, while that of the core layer was perpendicular to the flow direction. The fiber orientation of each layer was the same as the molecular orientation of the LCP. The fiber composites showed improved mechanical properties, such as bending modulus, strength, and interlaminar peel strength molded LCP plaques.