Abstract
The thermotropic liquid crystalline polyester (LCP) with a long flexible spacer in the main chain was prepared by melt polymerization. A blend of polycarbonate (PC) and LCP was prepared by melt mixing. Morphological, thermal and mechanical properties of the blend were investigated by scanning electron microscopy (SEM), differential scanning calorymetry (DSC), cross-polarizing microscope and tensile test. SEM observations proved that the interfacial adhesion between PC and LCP was good and spherical or ellipsoidal particles of LCP in the matrix were deformed to a microfibril structure under an extension flow. The ratio of the LCP domain increased with LCP content. Fibers were made by passing the blend through a capillary rheometer with varying draw ratio. The microfibrils of LCP in the blend fiber had smaller diameter as the draw ratio increased. Tensile tests showed that a fiber with 30 wt% LCP made at 8 draw ratio had three times the strength at the break and modulus but had much lower elongation at the break than that of PC. The mechanical properties of fibers were highly affected by the draw ratio.
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Shin, B., Chung, I. Polymer Blend of Polycarbonate and Thermotropic Liquid Crystalline Polyester with a Long Flexible Spacer in the Main Chain. Polym J 21, 851–861 (1989). https://doi.org/10.1295/polymj.21.851
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DOI: https://doi.org/10.1295/polymj.21.851
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