中文摘要：

采用两步法反应挤出工艺制备硅烷接枝交联MgO/高密度聚乙烯（MgO/HDPE）导热复合材料,研究了硅烷接枝、交联对MgO/HDPE复合材料的结晶性能、力学性能、耐热性、导热性能的影响,并利用FTIR和DSC对其接枝交联、结晶情况进行表征。结果表明,交联MgO/HDPE复合材料的拉伸强度、缺口冲击强度、热变形温度（HDT）分别由未交联时的20.41 MPa、1.875kJ/m~2和74.6℃提升到27.24 MPa、7.875kJ/m~2和83.5℃,并且热导率保持基本不变0.447 W/（m·K）。

英文摘要：

The silane grafting and crosslinking high density polyethylene（HDPE）filled with MgO was prepared by the method of two-step reaction-extrusion,in order to study the effects of the silane grafting and crosslinking on the crystallinity,the mechanical properties,the heat resistance,and the thermal conductivity of the MgO/HDPE composites.And the graft-crosslinking and the crystallization were characterized by FTIR and DSC,respectively.The results show that the tensile strength,the notched impact strength and the heat deflection temperature（HDT）of the MgO/HDPE composites increase from 20.41 MPa,1.875kJ/m~2 and 74.6 ℃ without graft-crosslinking to 27.24 MPa,7.875kJ/m~2 and 83.5℃respectively after crosslinking,and the thermal conductivity of the crosslinking composites（0.447 W/（m·K））is almost the same with the non-crosslinking ones.