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The time resolved fast pulsed electro-acoustic (PEA) method is used to investigate the space charge characteristics in an additive-free poly(propylene-ethylene) (PPE) copolymer in film form. The 190 mum-thick films were submitted to DC and low frequency AC stress for various durations at various temperatures. Upper electrode (UE) and lower electrodes (LE) are semi-conductive polyethylene and aluminum,...
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