Effect of pressure on crystallinity of injection molded PP/POE blends: be different on crystallization kinetics

摘要

In this experiment, a different effect of pressure on crystallinity and crystallization kinetics was found compared with anterior research [1]. This experiment is concern with the effect of holding pressure on crystallinity of isotactic polypropylene (iPP) in injection molded polypropylene (PP) /Ethylene-Octane Copolymer (POE) blends with fixed weight ratio (75/25). Sliced samples cutting from the midway of the moldings were investigated by differential scanning calorimetry (DSC). Absolute crystallinity of PP of every sample with different depth can be calculated. Crystallinity was found to be decreased with increasing holding pressure although the crystallization kinetics was accelerated.