Effect of Additive-added Epoxy on Mechanical and Dielectric Characteristics of Glass Fiber Reinforced Epoxy Composites

Effect of Additive-added Epoxy on Mechanical and Dielectric Characteristics of Glass Fiber Reinforced Epoxy Composites

Three different types of additives, thiokol, epoxidized natural rubber (ENR) and epoxidized linseed oil (ELO),were dispersed in an epoxy matrix before being used in glass fiber (GF) composites, and their effects on the mechanicaland dielectric properties of epoxy resin and glass fiber reinforced epoxy composites (GF/EP) were examined. The additionof each of 7 phr ENR, 9 phr ELO and 5 phr thiokol into the epoxy resin increased the fracture toughness significantlyby 56.9, 43.1, and 80.0%, respectively, compared to the unmodified resin. The mode I interlaminar fracture toughnessof the GF/EP at propagation was also improved by 26.9, 18.3 and 32.7% when each of 7 phr ENR, 9 phr ELO, and 5 phrthiokol, respectively, was dispersed in the epoxy matrix. Scanning electron microscopy showed that the additives reducedcrack growth in the GF/EP, whereas their dielectric measurements showed that all these additives had no additional effecton the real permittivity and loss factor of the GF/EP.

Three different types of additives, thiokol, epoxidized natural rubber (ENR) and epoxidized linseed oil (ELO),were dispersed in an epoxy matrix before being used in glass fiber (GF) composites, and their effects on the mechanicaland dielectric properties of epoxy resin and glass fiber reinforced epoxy composites (GF/EP) were examined. The additionof each of 7 phr ENR, 9 phr ELO and 5 phr thiokol into the epoxy resin increased the fracture toughness significantlyby 56.9, 43.1, and 80.0%, respectively, compared to the unmodified resin. The mode I interlaminar fracture toughnessof the GF/EP at propagation was also improved by 26.9, 18.3 and 32.7% when each of 7 phr ENR, 9 phr ELO, and 5 phrthiokol, respectively, was dispersed in the epoxy matrix. Scanning electron microscopy showed that the additives reducedcrack growth in the GF/EP, whereas their dielectric measurements showed that all these additives had no additional effecton the real permittivity and loss factor of the GF/EP.