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采用四螺杆挤出机和双螺杆挤出机将ＰＰ和ＵＨＭＷＰＥ挤出共混制成ＰＰ／ＵＨＭＷＰＥ合金，并测试其力学性能，用ＳＥＭ和ＤＳＣ对两种共混方式所制备的合金的亚微形态和热性能进行了考察。发现四螺杆挤出机能将ＵＨＭＷＰＥ均匀地分散在ＰＰ基体中，使合金的缺口冲击强度和其它力学性能得到显著的提高，其冲击样条断裂面上呈现细点状结构；同时在合金中，ＵＨＭＷＰＥ与ＰＰ形成共晶结构，并导致ＵＨＭＷＰＥ熔点下降；表明ＵＨＭＷＰＥ以准分子水平分散在ＰＰ基体中，形成“线性互穿网络”结构。而双螺杆挤出机对ＰＰ／ＵＨＭＷＰＥ合金的共混效果却不佳，所制备的合金的力学性能不能得到有效的提高，冲击样条断口呈现典型的脆性断裂行为；合金中也不存在共晶结构。证明对于ＰＰ／ＵＨＭＷＰＥ合金，四螺杆挤出机比双螺杆挤出机具有更好的共混效果。
The PP and UHMWPE were extruded and blended into PP / UHMWPE alloy by four-screw extruder and twin-screw extruder, and the mechanical properties were tested. The submicron Morphology and thermal properties were investigated. It is found that the four-screw extruder can uniformly disperse UHMWPE in the PP matrix, and the notched impact strength and other mechanical properties of the alloy are remarkably improved. The fracture surface of the impact spline shows a fine point structure. Meanwhile, UHMWPE and PP forms a eutectic structure and leads to a decrease in the melting point of the UHMWPE. It indicates that the UHMWPE is dispersed in the PP matrix at an excimer level to form a “linear interpenetrating network” structure. However, the blend performance of PP / UHMWPE alloy is not good, the mechanical properties of the prepared alloy can not be effectively improved, and the fracture of impact specimen shows the typical brittle fracture behavior. The eutectic does not exist in the alloy structure. It is proved that the four-screw extruder has a better blending effect than the twin-screw extruder for the PP / UHMWPE alloy.