轻质低介电石英纤维/环氧树脂基复合材料的制备与性能OA

A lightweight and low dielectric quartz fiber/epoxy resin based composite material has been developed to meet the requirements of low thermal conductivity and low dielectric performance in the aerospace industry.The thermal behavior of the material was determined by differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA).Its density,thermal conductivity and dielectric constant were investigated using a solid density me-ter,thermal conductivity tester and vector network analyzer.The results show that the amount of curing agent has a significant impact on the crosslinking reaction efficiency of epoxy resin.The crosslinking reaction efficiency is the highest and the curing exothermic enthalpy value is the best when the amount of curing agent is 45％(based on the mass of epoxy resin).When the amount of foaming agent is 5％,the density of the prepared quartz fiber/epoxy resin composite material is reduced by 27％compared with the unfrothed epoxy resin composite material,the thermal con-ductivity is reduced by 11％,the dielectric constant is reduced by 31％,and the dielectric loss is reduced by 48％.