Correlation Between Solidification Behavior and Melt Crystallization Kinetics of Isotactic Polypropylene (iPP) during Injection Molding

摘要

The relationship between solidification behavior and crystallization kinetics, during the injection molding process of isotactic polypropylene (iPP) was investigated. It was found that the crystallization rate was in proportion to the cooling rate. The existence of a turning point (TP) in the dimensionless temperature (θ) vs. ln t curve, which is potentially applicable for the estimation of cooling time, was experimentally verified for iPP. The present study is expected to be useful for the optimization of the processing conditions during injection molding of crystalline polymers, and also supplies a good insight into further study of the "processing-structure-property" relationship of polymeric materials.