STRUCTURE AND PROPERTIES OF SELF-REINFORC ED 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) prepare d by oscillating packing injection molding. The Young's modulus and te nsile strength of HDPE have been enhanced greatly from original 1.0 GP a, 23 MPa to 5.0 GPa, 93 MPa respectively. DSC, TEM and X-ray diffract ion investigations indicate the improvement in mechanical properties i s ascribed to the production of shish-kebab crystals, the orientation of molecular chains along the flow direction and well developed spheru lites. Compared to high pressure injection molding, the method had goo d perspective in practical application.