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The effects of thermal stress on the breakdown behavior of biaxially oriented polypropylene (BOPP)-silica nanocomposite thin film and commercial BOPP film was evaluated with a step stress experiment in the temperature range of 50…110 °C. Weak spots were measured in thermally aged unfilled BOPP films but not in the PP-silica, which in turn displayed increasing scatter of the breakdown voltages and...
Apart from its chemical structure, mechanical properties of polymers depend mainly on polymer morphology, which is determined by the processing conditions. Exposure of the materials at elevated temperatures lead to changes in polymer morphology. The main objective of this study was to investigate the change in thermo-mechanical properties of different encapsulation materials (EVA, Ionomer) after damp...
Corrosion in Co-Ni-O film, which is adopted as the magnetic layer in metal evaporated tape media, was examined through aging tests, measurements of anode polarized characteristics, and analysis of both chemical bonding by ESCA and of crystallographic characteristics by RHEED. The following results were obtained. 1) The experimental results for exposure tests were strongly correlated with the anode...
The effect of ageing due to annealing of corona charged PVF2 films has been studied by observations of (i) changes in the X-ray diffraction patterns and (ii) decay of the piezoelectric strain coefficient d31. Annealing at progressively higher temperatures was observed to produce a gradual depolarization although considerable piezoelectricity was still remanent even at 150°C, The structural morphology...
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