Mechanical behavior of in-site composite polymers

The tensile and bending properties of blends of two thermotropic liquid crystalline polymers (TLCP) with a polycarbonate (PC) and a polyethersulfone (PES) were investigated respectively. Owing to the in-situ formed fibers of the disperse TLCP phase in matrix during the melt blending and mold filling, the polymers moduli can be reinforced substantially, and the reinforcement effect depends strongly on the processing conditions such as melt temperature and injection speed etc. The measured results from FTIR show that owing to the immiscibility between TLCP's and matrix polymers, there is only weak adhesion between these component, so that the reinforcement in bending strengths is not significant.