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本文采用DSC和扫描电镜研究了PP／UHMWPE的结晶行为及其亚微观形态结构。发现PP中的乙烯嵌段与UHMWPE具有良好的晶相相容性，生成了共晶；合金中乙烯链段和丙烯链段的结晶度随着UHMWPE掺混量的增加，总体分别呈上升和下降趋势，但结晶完善程度却基本无变化；混炼均匀的合金在较快的降温速率下UHMWPE先与PP结晶，并成为PP的成核剂，促使两组份同时结晶，结晶曲线呈现单峰；降温速率减慢后，出现两个结晶峰。电镜照片发现，合金冲击试样断面有大量UHMWPE形成的白色细点和细丝结构存在。结合结晶分析结果，认为UHMWPE在合金中形成了特殊的“物理交联网络”，并以此机理较全面地解释了UHMWPE对PP力学、流变等性能的影响。
In this paper, the crystallization behavior of PP / UHMWPE and its submicroscopic morphology were studied by DSC and SEM. It was found that the ethylene block in PP had good phase compatibility with UHMWPE and formed eutectic. The crystallinity of ethylene and propylene in the alloy increased and decreased with the increase of UHMWPE content, respectively Trend, but the degree of perfect crystallization but basically no change; uniform mixing of the alloy at a faster cooling rate of UHMWPE first with PP crystallization, and become a PP nucleating agent, prompting the two components simultaneously crystallized, the crystallization curve showed a single peak; After the cooling rate slowed down, two crystallization peaks appeared. Electron microscopy images showed that there were a large number of white fine spots and filaments formed by UHMWPE in the cross section of the alloy impact specimen. According to the results of crystallization analysis, it is considered that UHMWPE forms a special “physical crosslinked network” in the alloy, and this mechanism fully explains the influence of UHMWPE on the properties of PP such as rheology and rheology.