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| Titel: |
ELECTRICAL CONDUCTIVITY STUDIES ON IMPREGNATED PAPER SHEET WITH EICHHORNIA CRASSIPES PHENOL POLYCONDENSATE RESINS |
| Auteur: |
Sayyah, S. M. Khalil, A. B. Sabry, A. I. Rashed, I. H. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 51 (2002) nr. 10 pagina's 939-954 |
| Jaar: |
2002-10 |
| Inhoud: |
Polycondensate resin was prepared from Egyptian Eichhornia Crassipes powder (EECP) and phenol using conc. HCl as catalyst at 100°C. Modifications of the produced resin with phenol-formaldehyde and phenol-benzaldehyde were performed. Infrared spectroscopic studies and element analysis were carried out in order to determine the complicated resin structure. The d.c electrial resistivity ( ρ) of these materials was measured. It was found that ρincreases with the temperature (T), together with the resin concentration (c). A maximum in ρwas found for all samples varied from ρ=10 5 to 10 9 \Omega \cdot cm in the temperature range from room temperature upto 100°C. The resistivity of the fllter paper sheet was found to increase when impregnated with the resin EECP-phenol in a similar way with T and c. ρwas found to increase more when the resin was modified with phenol-formaldehyde and less so when the resin was modified with phenol-benzaldehyde. The data obtained for ρwas explained in relation to both the temperature and the structure. An attempt was made to interpret the conduction mechanism in view of current theories. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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