玻璃纤维增强环氧树脂复合材料的绝缘性能和力学性能研究

Study on Insulation and Mechanical Properties of Glass Fiber Reinforced Epoxy Resin Composites

利用KH-550改性玻璃纤维(GF),提高GF与环氧树脂(EP)基体的相容性,制备了玻璃纤维增强环氧树脂复合材料(EP/GF),并研究了GF掺量对EP/GF复合材料绝缘性能和力学性能的影响。结果表明:GF掺量不超过30%时,GF能够均匀分散于EP中。GF掺量达到40%时,GF出现团聚,且EP基体产生孔隙等缺陷。GF掺量为30%时,EP/GF复合材料的绝缘性能和综合力学性能最好,与纯EP相比,复合材料的体积电阻率提高了36.9%,相对介电常数(εr)和介质损耗因数(tanδ)分别降低了11.4%和8.9%,交流短时击穿电压值提高了27.8%,弯曲强度提高了38.2%,冲击强度提高了40.0%,拉伸强度增加了40.4%,断裂伸长率降低了11.1%,硬度提高了5.9%。

Glass fiber(GF) was modified by KH-550 to improve the compatibility between GF and epoxy resin(EP)matrix,and glass fiber reinforced epoxy resin composites(EP/GF) were prepared.The effects of GF content on the insulation and mechanical properties of EP/GF composites were studied.The results show that GF can be uniformly dispersed in EP when the content of GF does not exceed 30%.When the content of GF reaches 40%,GF agglomerates,and the EP matrix produces defects such as pores.When the content of GF is 30%,the insulation performance and comprehensive mechanical properties of EP/GF composites were the best.Compared with pure EP,the volume resistivity of the composites is increased by 36.9%,the relative dielectric constant(εr) and dielectric loss factor(tanδ) are decreased by 11.4% and 8.9%,respectively.The short-term AC breakdown voltage value is increased by 27.8%,the bending strength is increased by 38.2%,the impact strength is increased by 40.0%,the tensile strength is increased by 40.4%,the elongation at break is decreased by 11.1%,and the hardness is increased by 5.9%.