Effect of Composite Proportion of Inorganic Fillers on Properties of Composite Films
Based on the study of the properties of thermal conductive composite films,a new preparation method of thermal conductive composite films is provided in this work.By adding boron nitride(BN)and silicon dioxide(SiO2)to polybutadiene resin(PB),the high thermal conductivity BN/SiO2 filled composite film was prepared by coating process.The effects of different addition amounts of BN on the microstructure,thermal conductivity,dielectric properties,stripping resistance and thermal expansion coefficient of BN/SiO2 filled composite films were systematically studied.The results show that with the increase of BN content,the surface defects of the composite films increase gradually,the dielectric constant decreases slightly,the dielectric loss increases slightly,the stripping strength also decreases,and the thermal expansion coefficient of X-Y-Z axis also increases gradually.Finally,when the BN/SiO2 added mass ratio is 10∶30(BN added amount is 10% ),the composite film filled with BN/SiO2 has the best comprehensive performance,the thermal conductivity is 0.75 W m-1K-1,the dielectric constant is 3.20,and the dielectric loss factor is 3.12*10-3.The stripping strength is 2.2 Nm-1,and the coefficient of thermal expansion is suitable.It is expected to provide a new practical idea for the development of novel high thermal conductivity composite film materials.
NETL
NSTL
万方数据
