低密度聚乙烯在振动填充注射过程中的自增强

THE SELF REINFORCEMENT OF LOW DENSITY POLYETHYLENE BY OSCILLATING PACKING INJECTION MOLDING UNDER LOW PRESSURE

聚烯烃自增强的研究极具应用前景，正逐渐成为人们关注的热点．其目的是利用现有通用级聚烯烃材料，通过特殊的加工方法，挖掘材料内在潜力，开发力学性能可与工程塑料相媲美的聚烯烃制品．我们的研究表明，利用振动填充注射成型技术，在低压下就能实现普通高密度聚乙烯（...

The self reinforcement of low density polyethylene (LDPE) in the oscillating stress field under low pressure was studied.With the orthogonal statistical analysis method,the optimum processing parameters have been found.The tensile strength of LDPE increased from 10 MPa of ordinary products to 21*!MPa of self reinforced specimen.The DSC and X ray investigation indicates that the enhancement of tensile strength is due to the high degree orientation of macromolecule along flow direction and the crystalline refinery.The self reinforced LDPE is more transparent than ordinary LDPE specimen due to crystalline refinery.The specimen breaks by tensile in a ductile manner,the toughness and elongation has not decreased with the increase of tensile strength.