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Thermally stimulated current (TSC) spectra of powder-formed polymethylmethacrylate (PMMA) of different particle sizes were observed in a temperature range between room temperature and 160 °C. From comparison of these TSC spectra with that of melt-cast PMMA samples, it was found that pulverization produces two kinds of new charge trapping sites which were shallower and deeper than the inherent charge...
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