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Epoxy polymers reinforced with a premixed epoxy/nano-silica masterbatch or dry non-surface-treated nano-silica and ground micro-silica flour were compared. Cured plates of epoxy containing both nano-particles (up to 15 %wt) and micro-particles (up to 51 %wt) of silica were produced and tested. The glass transition temperature, Tg, of the epoxy was measured using differential scanning calorimetry (DSC),...
Bulk samples of epoxy were modified with organically-modified nanoclays. The morphology of the modified materials has been characterised using microscopy and X-ray diffraction techniques, and found to be intercalated. Improvements in tensile and fracture properties were found. The toughening mechanisms were crack deflection and plastic deformation of the epoxy. The permittivity and loss angle of the...
Epoxy resin is a material that is widely used as insulation for power transformers and printed circuit boards. In this paper, the short time interval decay measurement of space charge in an epoxy resin is described. Most of the charge was positive space charge that was formed near the anode and measured just after an applied voltage in the range 8-13 kV was removed. Most of this charge disappeared...
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