本发明提供了一种改性超高分子量聚乙烯及其制备方法、聚乙烯复合材料及其制备方法,属于高分子材料制备技术领域。本发明以1,3,5-三氯苯为溶剂,该溶剂的熔点远高于室温,且易溶解超高分子量聚乙烯；溶剂的稀释作用,能够降低超高分子量聚乙烯的粘度,同时使超高分子量聚乙烯分子链处于舒展状态,再与填料混合时,能够确保超高分子量聚乙烯与填料均匀分散,进而复合,最终保证了改性超高分子量聚乙烯的性能。实施例的数据表明：采用本发明所得改性超高分子量聚乙烯获得聚乙烯复合材料薄膜的导电率为200～5800s·m^-1,拉伸模量为1250～2750MPa,拉伸强度为10～37MPa。

The invention provides a modified ultrahigh-molecular-height polyethylene, a preparation method thereof, a polyethylene compound material and a preparation method thereof and belongs to the technical field of preparation of high-polymer materials. According to the modified ultrahigh-molecular-height polyethylene and the preparation method thereof, 1, 3, 5-trichlorobenzene serves as solvent with a melting point considerably higher than the room temperature and can easily dissolve ultrahigh-molecular-height polyethylene; the dilution effects of the solvent can reduce the viscosity of the ultrahigh-molecular-height polyethylene can and meanwhile ensure that the molecular chains of the ultrahigh-molecular-height polyethylene can be in an expanded state, so than when being mixed with filler, the ultrahigh-molecular-height polyethylene can be uniformly dispersed in the filler and further compounded with the filter to ensure the performance of the modified ultrahigh-molecular-height polyethylene. Data suggests that a polyethylene compound material film prepared from the modified ultrahigh-molecular-height polyethylene can achieve an electric conductivity of 200-580 s*m-1, a tensile modulus of 1250-2750 MPa and a tensile strength of 10-37 MPa.