Thermal properties of the polypyrrole-poly(methyl methacrylate) (PPy)-(PMMA) compositeswere analyzed by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). A decrease in the glass transition temperatures Tg with the PPy concentration content reveals the increase of segmental motion. Dielectric properties of these composites were studied in the frequency range between 100 Hz and 100 KHz at room temperature for various weight percentage of PPy. The results of the spectra of complex permittivity obey power laws of Jonscher. The values of the exponents n and p are close to 1, which corresponds to a fully correlated system.
Key words: Composites, dielectric properties, percolation threshold, conducting polymer.
TGA, Thermal gravimetric analysis; DSC, differential scanning calorimetry; PPy, polypyrrole; PMMA, poly(methyl methacrylate).
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