Studies on the Thermal and Dynamic Mechanical Properties of UP/GF/LCPU In-Situ Hybrid Composites

One kind of novel reactive thermotropic liquid crystalline polymer(LCPU) has been synthesized,UP/GF/LCPU in-situ hybrid composites have been successfully prepared by melt mixing technology.The thermal properties of in-situ composites have been systematically studied by differential scanning calorimetry(DSC),thermogravimetric analysis(TGA) and dynamic mechanic analysis(DMA).The fracture surfaces of composites specimen were observed by scanning electron microscope(SEM).DSC and TGA.Results indicate that the thermal stability of the composites containing LCPU 2.5% is higher than that the composites containing TLCP content2.5%.Dynamic mechanic analysis reveals that the glass transition temperature of composites increases with increasing of LCPU until LCPU content is up to 7.5%,the microstructure of curing network and obdurability of composites was improved effectively due to the addition of LCPU.The SEM observation analysis shows that the interfacial adhesion between UP matrix and GF has been improved due to the addition of LCPU and LCPU plays an important role in the fracture energy improvement of composites.