Effect of Hybridization of Carboxyl‐Terminated Acrylonitrile Butadiene Liquid Rubber and Alumina Nanoparticles on the Fracture Toughness of Epoxy Nanocomposites

Abstract

The aim of this work was to study the effect of carboxyl‐terminated acrylonitrile butadiene (CTBN) liquid rubber and alumina nanoparticles (Al2O3) on the fracture toughness of an epoxy resin. Hybrid nanocomposite samples were prepared by the inclusion of the optimum concentration of CTBN (15 phr) and 0–10 phr Al2O3 into the epoxy matrix. Samples were examined using Fourier transform infrared spectroscopy, scanning electron microscopy, and fracture toughness test. Fractal dimension values were also estimated from the edge of the fracture surfaces for the hybrid samples. The maximum value of critical stress intensity factor, K IC, was found for the non‐hybrid sample containing 15 phr CTBN and the G IC values showed an increasing trend as it was expected from the increase in K IC values and decrease in Young's modulus. The maximum K IC for the hybrid samples was obtained for the one containing 7 phr Al2O3 and an almost similar trend was observed for G IC, accompanied with the significant changes in the fracture surface morphology. These were consistent with the fractal dimension results, where the sample containing 7 phr Al2O3 exhibited the maximum roughness. Therefore, the hybrid system of epoxy/CTBN (15 phr)/Al2O3 (7 phr) was found to be the optimum formulation. POLYM. COMPOS., 40:2700–2711, 2019. © 2018 Society of Plastics Engineers

Enhancement of surface insulation properties of alumina/epoxy composites through ZrO2 film sprayed by plasma atomization

“…[42] Based on the isothermal surface potential decay theory, the distribution of trap energy levels is shown in Figure 16. The trap energy level and trap density in Figure 16 are calculated by Formulas (6) and (7). [43] It can be found that the trap center energy level of the sample decreases with the time of zirconia deposition increasing.…”

“…[1][2][3][4] However, under the DC electric field, charges are easily accumulated in epoxy-based insulation materials, which directly affect the insulation properties and easily induce flashover phenomena. [5][6][7][8][9] Preceding theoretical researches showed that surface morphology and chemical element of insulating materials can affect the motion characteristics of surface charges, and then influence the flashover. [10][11][12][13] At present, methods for surface modification of polymers including surface group modification, surface fluorination, oxide film surface deposition, changing the surface morphology of materials, and organic coating synthesis.…”

Dynamic Cure Kinetics and Physical-Mechanical Properties of PEG/Nanosilica/Epoxy Composites

“…However, almost all EPs are brittle [12][13][14]. Many tougheners such as carboxyl-terminated butadiene-acrylonitrile (CTBN) [15,16], core-shell rubber (CSR) particles [17,18], thermoplastic or thermoset polymers [19,20], and organicinorganic particles [21,22] have been incorporated to increase the toughness of EP resins. These tougheners decrease modulus, tensile strength, and glass transition temperature (T g ); so in order to enhance the mechanical and thermal properties, the toughened EPs are reinforced by nanosilica (NS) particles.…”

Fluorinated SnO2/ER as an antistatic coating for enhancing the surface insulating strength of epoxy insulators

“…[1][2][3][4] The GIL disk insulator is mainly made of epoxy resin composites doped with micro-Al 2 O 3 with a mass fraction of 60%, which has guaranteed the thermal, mechanical, and basic insulation requirements for the insulator. [5][6][7] However, the doping of Al 2 O 3 fillers has also reduced the surface insulation performance. Due to the obstruction of charge transport brought by filler Al 2 O 3 , the surface of the insulator would accumulate a large amount of net charge under longterm action of DC electric field, which would aggravate the distortion of surface electric field, thus to induce the accidents of flashover.…”

“…The flashover accident of the disk insulator can be the most severe one 1–4 . The GIL disk insulator is mainly made of epoxy resin composites doped with micro‐Al 2 O 3 with a mass fraction of 60%, which has guaranteed the thermal, mechanical, and basic insulation requirements for the insulator 5–7 . However, the doping of Al 2 O 3 fillers has also reduced the surface insulation performance.…”