Abstract
Thermal properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC). From the measured glass transition temperature (Tg) and specific heat increment (ΔCp) at the Tg, the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1) of LCP in the PC-LCP blends were investigated using the lattice theory in which the anisotropy of LCP was taken into consideration. The χ12 of PC-LCP blend was calculated from the measured Tg and found to be 0.076±0.008 at 250°C. The y/x1 of LCP in amorphous phase was found to be increased with the increase of PC weight fraction in the PC-LCP blends.
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