The Microstructure of Micro-Injection Molded High Density Polyethylene

摘要

Micro-injection moldings were obtained for high density polyethylene (HDPE), to study the effects of processing conditions on the microstructural characteristics and mechanical properties of the moldings. Various microstructural features, such as skin-core structure, skin layer thickness fraction, and distribution of crystalline shape and size, were observed under different processing conditions and analyzed and compared to observations made with poly(oxymethylene) (POM). Process-structure-Young's modulus relationships were analyzed by considering the effects of skin layer thickness, average plunger velocity. Suggestions for mold design were proposed on the basis of polymer melt flow behaviour.