Abstract
The morphology of liquid crystalline polymer (LCP)/poly(ethylene terephthalate) (PET) blends using a melt mixer equipped with a gap-adjustable milling part was investigated. From the scanning electron microscopic (SEM) observation, the isotropic structure in which spherical LCP domains were dispersed homogeneously in a PET matrix was attained in this study, if the LCP component was 50% or below. The wide-angle X-ray diffraction (WAXD) pattern of the LCP/PET=50/50 blend extrudate suggested that the LCP phase had an unoriented structure, showing a single reflection of 0.45 nm. In the case of the LCP/PET=50/50 blend extrudate, the difference between the linear expansion coefficient ( α) parallel to the machine direction, α (MD), and that perpendicular to the MD, α (TD), was estimated to be very small; the α (TD)/ α (MD) ratio was 1.153. These results are in agreement with the results of the WAXD profile, and clearly suggest that the anisotropy in the α of the blend extrudate is significantly reduced by the use of a melt mixer equipped with a milling part.
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