导热SiC/LLDPE复合塑料制备及性能研究

Preparation and Properties of Thermal Conductive SiC/LLDPE Composite Plastics

采用碳化硅(S iC)和线性低密度聚乙烯(LLDPE)粒子经粉末混合和热压成型制得导热复合塑料。研究了S iC粒子含量对LLDPE熔融温度、结晶度、热导率、介电及力学性能的影响。结果表明:S iC粒子降低了LLDPE结晶度,对熔融温度无明显影响;随S iC含量增加,热导率升高,介电常数和损耗升高,但仍然保持在较低数值,而力学性能下降。

A thermally conductive composite plastics was obtained form a particles mixture of silicon carbide （SiC） and linear low-density polyethylene （LLDPE） by a powder mixing and hot press molding. The effects of SiC content on the melting temperature, crystallinity, thermal conductivity, dielectric and mechanical properties were investigated. The results demonstrated that the useing of SiC decreased the crystallinity of LLDPE,and had no significant influence on the melting temperature. As an increasing in SiC concentration, the thermal conductivity rose, the dielectric constant and loss increased, however, they still remained relatively low values. The mechanical properties of filled LLDPE obviously decreased with increasing the content of SiC.