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This work is focused on the characterization of dielectric, mechanical and physicochemical properties of a commercially available PEI resin. The complex shear modulus is determined using the Dynamic Mechanical Analysis (DMA). The complex dielectric permittivity is measured using the broadband dielectric spectroscopy. In order to complement the mechanical and dielectric results, Differential Scanning...
The electric strength and the dielectric properties of different polymers with film thicknesses from s = 1 ... 100 μm are presented. The experimental data of the electric strength of PMMA and an acrylic polyester resin is obtained without partial discharges by the use of a special test item design. Based on these results a model is then presented which may describe the breakdown mechanism in consideration...
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),...
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