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Thermal and Spectral Dielectric Properties of Polypyrrole/Polymethylmethacrylate Composites |
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| Authors: | N Aribou A Elmansouri L C Costa A Belhadj Mohamed A Oueriagli |
| Institution: | 1. Département de Physique, Faculté des Sciences , Laboratoire des Systèmes de Télécommunications et Ingénierie de la Décision, Université Ibn Tofail , Kénitra , Morocco;2. Laboratoire de Physique des Solides et des Couches Minces, Faculté des Sciences , Sémlalia , Marrakech , Morocco;3. I3N and Physics Department , University of Aveiro , Aveiro , Portugal;4. Laboratoire de Photovolta?que et de Semi-conducteur, Centre de Recherche et des Technologies de l'Energie, Technopole Borj Cedria , Hammam-Lif , Tunisia |
| Abstract: | Thermal properties of polypyrrole/polymethylmethacrylate (PPy/PMMA) composites were analyzed by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). A decrease in the glass transition temperatures with PPy concentration reveals the increase of segmental motion. The dielectric properties of these composites were studied for several weight concentrations of PPy in the frequency range between 500 Hz and 0.2 MHz, over the temperature range 23–110°C. Jonscher's phenomenological model has been used for modeling the dielectric response of the composite materials. This study shows that the results obtained for the dielectric response are in good agreement with the results of TGA and DSC measurements. |
| Keywords: | conductor–polymer dielectric relaxation electrical properties percolation threshold polymer–matrix composite thermal properties |