Abstract
A p-v-T device of plunger type was used to investigate about the specific volume of solid and molten liquid crystalline polymers (LCPs), composites (LCP-GF) containing glass fibers (GF) as a function of pressure (up to 153MPa) and temperature (50-350°C). In this study, we have been discussed the temperature dependence and the effects of GF content on the compressibility and the using author's equation for the p-v-T properties of LCP determined by isothermal testing method.The compressibility-temperature relationships of LCP are characterized by a parabolic cuves of below convex, and it is minimum when the specimen temperature is about 120 and 150°C. The compressibility at 150°C of the LCP composites (HBG-140) filled with 40wt% of glass fibers are about 26% smaller than that unfilled LCPs. Consequently, their coefficients of cubical expansion are identified to be significantly affected by containing with GF. The specific volumes of solid and liquid LCP calculated by the empirical equation were evidenced to agree with measured values to within 0.7 to 0.9%.
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