Abstract
Dynamic mechanical measurement, flexural test, and SEM observation for poly (vinyl chloride) (PVC) filled with pitch-based graphite short fibers (PGF) in the range of 0-0.469 in volume fraction (φf), and those treated with silane and titanate coupling agents by φf=0.261, were carried out. During the blending with a hot mixing roll, the PGF particles in the specimens were broken, but they were aligned parallel to the machine direction (MD). As the φf increase, the storage modulus (E') and flexural modulus (Ef) of the specimens became higher. The E' values of the specimens were larger than those estimated from rule of mixture and modified Halpin-Tsai's equation in the glassy region and that calculated from Mooney's equation in the pseudo-rubbery region. The flexural strength for MD was larger than that of PVC, but that for transverse to the MD (TD) was decreased as the φf increase. The increase of affinity between PVC and PGF particles treated with coupling agents was relatively small.
