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、1.875 kJ/m2和74.6℃提升到27.24 MPa、7.875 kJ/m2和83.5℃,并且热导率保持基本不变0.447 W/(m·K)。
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,1.875 kJ/m2 and 74.6 ℃ without graft-crosslinking to 27.24 MPa,7.875 kJ/m2 and 83.5 ℃ respectively after crosslinking,and the thermal conductivity of the crosslink-ing composites (0.447 W/(m·K))is almost the same with the non-crosslinking ones.
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