STRUCTURE AND PROPERTIES OF SELF-REINFORCED HIGH-DENSITY POLYETHYLENE PREPARED BY OSCILLATING PACKING INJECTION-MOLDING UNDER LOW-PRESSURE

This paper has studied the relationship of structure and properties of self-reinforced general grade high density polyethylene(HDPE) prepared by oscillating packing injection molding. The Young's modulus and tensile strength of HDPE have been enhanced greatly from original 1.0 GPa, 23 MPa to 5.0 GPa, 93 MPa respectively. DSC, TEM and X-ray diffraction investigations indicate the improvement in mechanical properties is ascribed to the production of shish-kebab crystals, the orientation of molecular chains along the flow direction and well developed spherulites. Compared to high pressure injection molding, the method had good perspective in practical application.