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| Titel: |
Tunnelling and Thermally Stimulated Phenomena in Highly Filled PMMA Composites |
| Auteur: |
Tawansi, A. Zidan, H. M. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 15 (1991) nr. 2 pagina's 77-83 |
| Jaar: |
1991-08-01 |
| Inhoud: |
Films of polymethylmethacrylate composites, filled with high volume fractions (P ≥ 26%) of Fe fine powder, were prepared by casting method. The electrical resistivity was measured in the temperature range of 305-406 K. Composites of P = 26-34% exhibited a temperature (T) independent resistivity in the range of T = 305-400 K indicating the predominance of a tunnelling conduction. Relatively sharp resistivity peaks were observed at T > 400K, due to the thermally stimulated discharging current (TSDC). Composites of P > 34% were characterised by broad TSDC peaks without tunnelling region. The results were interpreted on the basis of a previously suggested theoretical model which considers the discharge process in a dielectric with two bipolar deeply trapped charge layers. It is implied that the present system exhibits a high effective surface charge density and a low value of the average electric field inside the layers. These results ruled out the application of simple percolation models and confirmed the internal conduction mechanisms in such multiphase networks. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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