采用自制的动态保压注射成型(DPIM)装置,向中等分子量的 HDPE 中添加高、低分子量聚乙烯(HMWPE、LMWPE)双重诱导成型自增强串晶的组织与性能影响进行研究.实验表明,在双重诱导和采用 DPIM 装置下,试样产生了大量的串晶结构,在160℃动态保压注射试样的拉伸强度为111．6 MPa,是其 HDPE 纯料静态试样拉伸强度24．5 MPa 的4．56倍,提高了355．5％；通过 WAXD、DSC 和 SEM 测试可知,在 DPIM 下,试样产生互锁紧密的串晶结构；高分子量聚乙烯的加入有利于串晶脊纤维晶体的生成,低分子量聚乙烯的加入有利于片晶生长增厚,从而使得串晶结构更完善.
The influence of self-enhancement and shish-kebab of the middling-HDPE added high molecular weight PE and low molecular weight PE was studied by using the self-designed and self-made dynamic packing injection molding (DPIM) equipment.Testing results show that tensile strength of dynamic sample was 1 1 1.6 MPa at 1 60 ℃,which was 4.56 times as high as the static one (24.2 MPa)and approximately increased by 355.5%;it was known that,from the test results of differential scanning calorimetry(DSC),scanning electron microscopy(SEM)and wide-angle X-ray diffraction (WAXD),the interlocking structure of shish-kebab was generated under the acts of DPIM.Adding high molecular weight PE can be beneficial to the formation of shish-kebab spine fiber crystal and the thickness of lamellar crystal was benefit from adding low molecular,so as to improve the property of shish-kebab.
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