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

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 (tan δ) 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%. [ABSTRACT FROM AUTHOR]