The influences of processing variables on the mechanical properties of general grade polypropylene prepared by oscillating packing injection molding under low pressure were reported. The density as a function of oscillating holding pressure was measured using density gradient columns. The existence of spherulites and shear-induced shish-kebab crystals was confirmed from DSC measurements. The texture of self-reinforced polypropylene was investigated using an X-ray diffractometer and an X-ray flat film camera. Investigations indicate that the mechanical properties of polypropylene can be greatly enhanced using oscillating packing injection molding. The Young's modulus and tensile strength have been enhanced from original 1.4 GPa, 31.0 MPa to 3.0 GPa, 57.8 MPa, respectively. The improvement in mechanical properties is mainly ascribed to perfect spherulites, the existence of shear-induced shish-kebab crystals, and the orientation of molecular chains. (C) 1996 John Wiley & Sons, Inc. [References: 12]
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机译：报道了工艺变量对在低压下通过振动填充注射成型法制备的普通级聚丙烯机械性能的影响。使用密度梯度柱测量密度作为振荡保持压力的函数。通过DSC测量证实了球晶和剪切诱导的烤肉串晶体的存在。使用X射线衍射仪和X射线平面胶片相机研究了自增强聚丙烯的织构。研究表明，使用振荡填充注射成型可以大大提高聚丙烯的机械性能。杨氏模量和拉伸强度分别从原来的1.4 GPa，31.0 MPa提高到3.0 GPa，57.8 MPa。力学性能的提高主要归因于完美的球晶，剪切诱导的烤肉串晶体的存在以及分子链的取向。 （C）1996 John Wiley＆Sons，Inc. [参考：12]
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