Enhancement of resistance to fatigue in polypropylene liquid crystalline polyester blends by rolling process

mWe investigated the microstructure and fatigue behavior of easily recyclab le polypropylene (FP)/liquid crystalline polyester (LCP) blends. PP and LCP are immiscible, i.e., the LCP phases are dispersed as rods in the matrix o f PP along the direction of injection molding. The tan delta increases and the E' decreases by a rolling process. The ductile property is thus improve d. Under a cyclic load, specimens of low rolling ratios easily generate hea t and have short lives. However, for the specimen of high rolling ratios (a bove 40%), the tan delta increases and the E' decreases. The resistance to fatigue is enhanced. In particular, the high rolling ratio specimens with r einforcements (LCP) has long life spans under fatigue loading at a low temp erature.