Fracture toughness of silica particulate‐filled epoxy composite

Abstract

ABSTRACT:The relationship between the postcuring conditions and fracture toughness on three silica particulatefilled epoxy composites was investigated. The glass transition temperature, T g , and the fragility parameter, m, derived from the thermo-viscoelasticity, were used to characterize the composites, which were postcured under various conditions. The glass transition temperature and fragility both depended on both of the curing conditions and the volume fraction of silica particles. The glass transition temperature increased with the postcuring time and temperature, while the fragility generally decreased as the volume fraction increased. There was no direct correlation between the glass transition temperature and fragility. The fracture toughness depended on both the glass transition temperature and fragility. The composites with a high glass transition temperature and low fragility had high fracture toughness. These results indicate that the glass transition temperature and fragility are useful parameters for estimating the fracture toughness of the silica particulate-filled epoxy composites.

Evaluation of fracture toughness of epoxy polymer composite incorporating micro/nano silica, rubber and CNTs

“…Nano and micron-silica particles bidispersed epoxy composites showed that the composites had a lower fragility with higher strength and fracture toughness with increase in nanoparticles [13] . Glass transition temperature and fragility are found useful parameters for estimating the fracture toughness of the silica particulate-filled epoxy composites [13,14] . Apart from mechanical properties epoxy resins in the uncured state have relatively high viscosities [15] .…”

Damage resistance and anticorrosion properties of nanosilica-filled epoxy-resin composite coatings

“…They studied the favourable effects of particle size, volume fraction and the quality of the dispersion on the mechanical response of the polymer composites [6,[14][15][16][17][18][19][20][21]. In addition, a lot of attention has been paid to epoxy coatings containing nanoparticles that show a significantly improved barrier performance for corrosion protection by decreasing the porosity [22].…”

Corrosion resistance of superhydrophilic and superhydrophobic TiO2/epoxy coatings on AISI 316L stainless steel

“…[7][8][9][10][11][12][13][14][15][16] It is mainly the favourable effects of the particle size, the volume fraction and the size distribution on the mechanical properties of composite coatings that have been studied. [17][18][19][20][21][22] Z. Rubab et al showed that sub-micron TiO 2 particles significantly enhance the glass-transition temperature, thermal oxidative stability, tensile strength and Young's modulus of epoxy polymers.…”