Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample

F. H. Abd El-kader; S. A. Gaffar; A. F. Basha; S. I. Bannan; M. F. H. Abd El-kader

doi:doi:10.11648/j.ejb.20140205.12

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Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample

F. H. Abd El-kader, S. A. Gaffar, A. F. Basha, S. I. Bannan, M. F. H. Abd El-kader

Published in European Journal of Biophysics (Volume 2, Issue 5)

Received: 2 November 2014 Accepted: 26 November 2014 Published: 28 November 2014

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Abstract

Thermally stimulated depolarization current (TSDC) and thermal sampling (TS) method were used to systematically characterize the α-relaxation process in gelatin and PVA homopolymers and their blend sample of 50/50 (wt/wt %) composition. In addition, γ-irradiation effect on TSDC spectra of samples under investigation was studied. Measurements of TSDC at different polarizing field strengths, polarization temperatures and times made it possible to obtain a complete picture of kinetic transitions, local modes of motion and space charge polarization in one heating cycle. On γ-irradiation, the change in shape, position and area of the α-relaxation peak of the samples were attributed to the variation of distribution function of associated relaxation times. The thermal sampling procedure was applied to decompose the complex relaxations into their narrowly distributed components. The molecular parameters such as activation energy (Ea) and pre-exponential factor (τo) for TS processes have been estimated. A linear relationship between the activation energy and logarithm of pre-exponential factor confirms the existence of a compensation behavior. The compensation temperature Tc and compensation time τc for the present samples have been determined.

Published in	European Journal of Biophysics (Volume 2, Issue 5)
DOI	10.11648/j.ejb.20140205.12
Page(s)	61-71
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Gelatin/PVA, Thermal Stimulated Depolarization Current, Thermal Sampling Process, Relaxation Processes

References

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F. H. Abd El-kader, S. A. Gaffar, A. F. Basha, S. I. Bannan, M. F. H. Abd El-kader. (2014). Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample. European Journal of Biophysics, 2(5), 61-71. https://doi.org/10.11648/j.ejb.20140205.12

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ACS Style

F. H. Abd El-kader; S. A. Gaffar; A. F. Basha; S. I. Bannan; M. F. H. Abd El-kader. Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample. Eur. J. Biophys. 2014, 2(5), 61-71. doi: 10.11648/j.ejb.20140205.12

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AMA Style

F. H. Abd El-kader, S. A. Gaffar, A. F. Basha, S. I. Bannan, M. F. H. Abd El-kader. Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample. Eur J Biophys. 2014;2(5):61-71. doi: 10.11648/j.ejb.20140205.12

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@article{10.11648/j.ejb.20140205.12,
  author = {F. H. Abd El-kader and S. A. Gaffar and A. F. Basha and S. I. Bannan and M. F. H. Abd El-kader},
  title = {Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample},
  journal = {European Journal of Biophysics},
  volume = {2},
  number = {5},
  pages = {61-71},
  doi = {10.11648/j.ejb.20140205.12},
  url = {https://doi.org/10.11648/j.ejb.20140205.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ejb.20140205.12},
  abstract = {Thermally stimulated depolarization current (TSDC) and thermal sampling (TS) method were used to systematically characterize the α-relaxation process in gelatin and PVA homopolymers and their blend sample of 50/50 (wt/wt %) composition. In addition, γ-irradiation effect on TSDC spectra of samples under investigation was studied. Measurements of TSDC at different polarizing field strengths, polarization temperatures and times made it possible to obtain a complete picture of kinetic transitions, local modes of motion and space charge polarization in one heating cycle. On γ-irradiation, the change in shape, position and area of the α-relaxation peak of the samples were attributed to the variation of distribution function of associated relaxation times. The thermal sampling procedure was applied to decompose the complex relaxations into their narrowly distributed components. The molecular parameters such as activation energy (Ea) and pre-exponential factor (τo) for TS processes have been estimated. A linear relationship between the activation energy and logarithm of pre-exponential factor confirms the existence of a compensation behavior. The compensation temperature Tc and compensation time τc for the present samples have been determined.},
 year = {2014}
}

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TY - JOUR
T1 - Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample
AU - F. H. Abd El-kader
AU - S. A. Gaffar
AU - A. F. Basha
AU - S. I. Bannan
AU - M. F. H. Abd El-kader
Y1 - 2014/11/28
PY - 2014
N1 - https://doi.org/10.11648/j.ejb.20140205.12
DO - 10.11648/j.ejb.20140205.12
T2 - European Journal of Biophysics
JF - European Journal of Biophysics
JO - European Journal of Biophysics
SP - 61
EP - 71
PB - Science Publishing Group
SN - 2329-1737
UR - https://doi.org/10.11648/j.ejb.20140205.12
AB - Thermally stimulated depolarization current (TSDC) and thermal sampling (TS) method were used to systematically characterize the α-relaxation process in gelatin and PVA homopolymers and their blend sample of 50/50 (wt/wt %) composition. In addition, γ-irradiation effect on TSDC spectra of samples under investigation was studied. Measurements of TSDC at different polarizing field strengths, polarization temperatures and times made it possible to obtain a complete picture of kinetic transitions, local modes of motion and space charge polarization in one heating cycle. On γ-irradiation, the change in shape, position and area of the α-relaxation peak of the samples were attributed to the variation of distribution function of associated relaxation times. The thermal sampling procedure was applied to decompose the complex relaxations into their narrowly distributed components. The molecular parameters such as activation energy (Ea) and pre-exponential factor (τo) for TS processes have been estimated. A linear relationship between the activation energy and logarithm of pre-exponential factor confirms the existence of a compensation behavior. The compensation temperature Tc and compensation time τc for the present samples have been determined.
VL - 2
IS - 5
ER -

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Author Information

F. H. Abd El-kader

Physics Department, Faculty of Science, Cairo University, Giza, Egypt
S. A. Gaffar

Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt
A. F. Basha

Physics Department, Faculty of Science, Cairo University, Giza, Egypt
S. I. Bannan

Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt
M. F. H. Abd El-kader

Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt

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APA Style

F. H. Abd El-kader, S. A. Gaffar, A. F. Basha, S. I. Bannan, M. F. H. Abd El-kader. (2014). Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample. European Journal of Biophysics, 2(5), 61-71. https://doi.org/10.11648/j.ejb.20140205.12

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ACS Style

F. H. Abd El-kader; S. A. Gaffar; A. F. Basha; S. I. Bannan; M. F. H. Abd El-kader. Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample. Eur. J. Biophys. 2014, 2(5), 61-71. doi: 10.11648/j.ejb.20140205.12

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AMA Style

F. H. Abd El-kader, S. A. Gaffar, A. F. Basha, S. I. Bannan, M. F. H. Abd El-kader. Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample. Eur J Biophys. 2014;2(5):61-71. doi: 10.11648/j.ejb.20140205.12

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@article{10.11648/j.ejb.20140205.12,
  author = {F. H. Abd El-kader and S. A. Gaffar and A. F. Basha and S. I. Bannan and M. F. H. Abd El-kader},
  title = {Thermally Stimulated Depolarization Currents and Thermal Sampling Technique of γ-Irradiated Gelatin and PVA Homopolymers and 50/50 (wt/wt %) Blend Sample},
  journal = {European Journal of Biophysics},
  volume = {2},
  number = {5},
  pages = {61-71},
  doi = {10.11648/j.ejb.20140205.12},
  url = {https://doi.org/10.11648/j.ejb.20140205.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ejb.20140205.12},
  abstract = {Thermally stimulated depolarization current (TSDC) and thermal sampling (TS) method were used to systematically characterize the α-relaxation process in gelatin and PVA homopolymers and their blend sample of 50/50 (wt/wt %) composition. In addition, γ-irradiation effect on TSDC spectra of samples under investigation was studied. Measurements of TSDC at different polarizing field strengths, polarization temperatures and times made it possible to obtain a complete picture of kinetic transitions, local modes of motion and space charge polarization in one heating cycle. On γ-irradiation, the change in shape, position and area of the α-relaxation peak of the samples were attributed to the variation of distribution function of associated relaxation times. The thermal sampling procedure was applied to decompose the complex relaxations into their narrowly distributed components. The molecular parameters such as activation energy (Ea) and pre-exponential factor (τo) for TS processes have been estimated. A linear relationship between the activation energy and logarithm of pre-exponential factor confirms the existence of a compensation behavior. The compensation temperature Tc and compensation time τc for the present samples have been determined.},
 year = {2014}
}

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