TSDC of Irradiated and Non-Irradiated Cellulose Acetate | ||||
| Egyptian Journal of Chemistry | ||||
| Article 22, Volume 64, Issue 5, May 2021, Page 2453-2468 PDF (630.99 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2021.57068.3228 | ||||
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| Authors | ||||
Tarek Fahmy   1, 2; E. O. Abdelmuttlib3; M. I. Abdelhamid2; W. B. Elsharkawy1; Z. M. Elqahtani4; M. T. Ahmed1, 2
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| 1Dept. of Physics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Kingdom of Saudi Arabia. | ||||
| 2Polymer Research Group, Physics Dept., Faculty of Science, Mansoura University, 35516 Mansoura, Egypt. | ||||
| 3Al-Mnsoura Specialist Hospital, 35511 Mansoura, Ministry of Health, Egypt. | ||||
| 4Dept. of Physics, College of Science, Princes Nourah bint Abdulrahman University, Ryiadh, Saudi Arabia. | ||||
| Abstract | ||||
| Films of cellulose acetate (CA) have been prepared by casting method using tetrahydrofuran (THF). CA films are γ-irradiated with varying radiation doses of 10, 20, 30, 40, 50 and 60 kGy using cobalt-60 (60Co) source. Global thermally stimulated depolarization current (TSDC) of non-irradiated and irradiated CA samples has been investigated under the effect of various poling electric field (Ep) in a temperature range from 300 K to 440 K. It is observed that, global TSDC spectra of non-irradiated and irradiated CA samples are characterized by two relaxation peaks. One in the low temperature range ~321 K and the other in the high temperature range ~ 376-383 K are observed for non-irradiated sample. On the other hand, these temperatures are shifted towards lower temperature for irradiated samples to be located at 317 K and ~371 K. These relaxations are assigned as and -relaxation and attributed to molecular motion of the polar acetate groups, C2H3O2 and polarization of the space charges, respectively. TS-technique has been carried out to decompose global TSDC spectra of all samples into its elementary peaks and the molecular parameters such as, activation energy and pre-exponential factor are calculated for each TS peak. Relaxation map (RM) of all samples has been analyzed using Eyring transformation and thermodynamic parameters such as, enthalpy activation (H), entropy activation (S) and Gibbs free energy (G) are estimated. The compensation phenomenon was verified by the linear relationship between both enthalpy and entropy. | ||||
| Keywords | ||||
| Cellulose Acetate; Irradiation; TSDC; Relaxation Map; Enthalpy; Entropy; Compensation | ||||
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