抄録
Effects of mold temperature on the mechanical properties of injection molded short fiber reinforced polypropylene were investigated. Flexural strength and the modulus were improved in line with increase of mold temperature. In addition, differential scanning calorimetry results showed that crystallinity of polypropylene was increased as the mold temperature increased. The flexural modulus could be predicted by a theory including fiber length distribution and interfiller distance. The analytical results suggested that increased modulus of polypropylene due to increase of mold temperature was the main reason for the increased flexural modulus of composites. The flexural strength could be explained by using a yielding condition due to pull - out of fiber. The condition showed that increased crystallinity of polypropylene due to increase of mold temperature was the main reason for the increased flexural strength of composites.
