PP/UHMWPE共混物力学性能的研究

Study on Mechanical Properties of PP/UHMWPE Blends

采用不同结构的聚丙烯 (PP)分别与不同流动性能的超高摩尔质量聚乙烯 (UHMWPE)进行共混 ,对共混物的力学性能进行了研究。发现PP和UHMWPE类型的适当匹配对共混物性能的提高非常重要。流动性较好的UHMW PE对熔体质量流动速率较小的嵌段共聚型PP (PPB)增韧增强效果突出 ,常温缺口冲击强度可达 74 2kJ/m2 ,断裂伸长率大于 70 0 % ;同时共混物的强度和刚性也有一定程度的提高。在PPB/UHMWPE二元共混物中加入适当线性低密度聚乙烯 (LLDPE) ,能够起到“减粘”和“增容”作用 ,有利于共混物性能 。

The PP with different structure was blended with the UHMWPE of different flowability, and the mechanical properties of the prepared blends were investigated It was found that a reasonable matching of the types of PP and UHMWPE was important to the improvement of the property of the blend system Propylene-ethylene block copolymer (PPB) with low melting flow rate could be extraordinarily toughened and strengthened by UHMWPE with fairly good flowability The charpy impact strength of the resulted blends could reach to 74 2kJ/m 2, the elongation at break was beyond 700%; and the tensile strength, as well as the bending strength, could be improved to some certain extent at the same time The adding of some low molecular weight PE, such as LLDPE, to PPB/UHMWPE blends could decrease the viscosity of UHMWPE and increase the compatibility between PPB and UHMWPE, being favorable to the improvement of the property, such as impact property, of the blend