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Epoxy used as insulating material in electronic and electrical devices plays an important role in system reliability. Addition of nanoparticles into epoxy can improve the insulating properties compared with undoped material. However, due to the change of the material structure, trap characteristics and charge behaviors are altered as a consequence. This possibly leads to a great risk of electric field...
Epoxy resin has become an integral part of electronic and electrical devices where the material is exposed to pulse stress. Surface charge accumulation and decay of charged dielectric materials are very important parameters related to the electrical properties of the material. Nano-composite technology makes it possible to improve electrical properties of insulating materials. Therefore, it is important...
The ability to form blends of polymers offers the opportunity of creating a new class of materials with enhanced properties. In addition to the polymer components, recent advances in nanoengineering have resulted in the development of nanosized inorganic particles that can be used to improve the properties of the blend, such as the flammability and the mechanical properties. While traditional methods...
This paper investigates the effect of nano-scale Al2O3 on the tracking failure resistance of silicone rubber nanocomposites. The samples were prepared by filling nano-scale Al2O3 in silicone rubber with the weight ratios of 0.25, 0.5, 1, 1.5, 3 wt%. AC voltage (0 kV-50 kV) was applied on a pair of needle-plate electrodes on the nanocomposites surface with insulation distance of 10 mm. The weight loss,...
This paper investigates the effect of nano-scale SiO2 on the tracking failure properties of nanocomposites. Test samples were made by dispersing nano-scale SiO2 powder in epoxy with the weight ratios of 0, 1, 3, 5, 7, 9 wt%. AC voltage was applied on a pair of needle-plate electrodes at the surface with the insulation distance of 10 mm. The time to tracking failure and discharge current were recorded...
A series of the polyimide-silica NLO nanohybrid materials were synthesized from 3,3', 4,4'- Bisphenyltetracarboxylic (BPDA), 2,2-Bis(3-amino-4-hydroxyphen-yl) hexafluoropropane (6FHP), nonlinear optical (NLO) molecule 4-(N-2-Hydroxyethyl-N-methylamino)-4'-[(6-nitroben-zothiazol-2-yl)-diazenyl] azobenzene (HNBDA), coupling agent APTES and hydrolysate of TEOS via sol-gel process. The TEOS contents in...
By carefully observing shear bands generated by tensile deformation in a transmission electron microscope, we report evidence of shear delocalization in a Cu-based glass containing nanoparticle dispersions. Nanocrystals grow in shear bands, delocalize the shear and deviate and blunt cracks. The results are consistent with matter in operating shear bands behaving like a semi-solid slurry.
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