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Thermal properties of polypyrrole–polymethylmethacrylate (PPy–PMMA) composites are analyzed by differential scanning calorimetry (DSC). A decrease in the glass transition temperature Tg with the PPy concentration content reveals the increase of segmental motion. The ac conductivity of these composites is studied in frequency range of 600 Hz to 1 MHz and temperature interval 23°C to 110°C. The study depending on the frequency has highlighted three domains: at low frequencies the conductivity is independent of frequency; at intermediate frequencies, the ac conductivity follows a power law in frequency; and at high frequency the ac conductivity can be explained in terms of hopping process.
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Achour et al. (2008) studied this question.
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