Thermally Stimulated Luminescence and Electron Spin Resonance Study of Gamma Irradiated Poly Carbonate

Authors

  • B. Sanjeeva Rao Government Degree College, Mulugu, Warangal District, Telangana, India
  • M. Papi Reddy Dravidian University, Kuppam, Chittoor, Andhra Pradesh, India
  • A. Raju Rayalaseema University, Kurnool, Andhra Pradesh, India
  • S. Kalahasti Dravidian University, Kuppam, Chittoor, Andhra Pradesh, India
  • E. Venkateshwar Rao Kakatiya University, Warangal, Telangana, India

DOI:

https://doi.org/10.37591/etce.v4i2.2452

Keywords:

Polycarbonate, gamma irradiation, TSL glow peaks, activation energy, ESR spectra, free radicals

Abstract

Polycarbonate (PC) is an industrially important polymer. Gamma irradiation effects of PC are investigated by thermally stimulated luminescence (TSL) and electron spin resonance (ESR) techniques. The TSL spectra of irradiated PC have shown two glow peaks, around 149oC (422 K) and 165oC (438 K). The observed glow peaks are analysed by initial rise methods, Chen’s method and modified initial rise method. The trap parameters corresponding to the two glow peaks and their activation energies are evaluated. A correlation of results between the three methods was observed. The glow peaks are assigned to be due to the release of trap centres facilitated by molecular motion of PC chains around the glass transition region. The trap centres are thought to be created due to the chain cleavages and subsequent reactions occurred due to irradiation of PC. The results are further confirmed by recording ESR spectra of irradiated PC under different conditions.

Author Biographies

B. Sanjeeva Rao, Government Degree College, Mulugu, Warangal District, Telangana, India

Department of Physics

M. Papi Reddy, Dravidian University, Kuppam, Chittoor, Andhra Pradesh, India

Department of Physics

A. Raju, Rayalaseema University, Kurnool, Andhra Pradesh, India

Department of Physics

S. Kalahasti, Dravidian University, Kuppam, Chittoor, Andhra Pradesh, India

Department of Physics

E. Venkateshwar Rao, Kakatiya University, Warangal, Telangana, India

Department of Physics

Downloads

Published

2019-04-24

Issue

Vol. 4 No. 2 (2017)

Section

Articles

License

Declaration and Copyright Transfer Form

(to be completed by authors)

I/ We, the undersigned author(s) of the submitted manuscript, hereby declare, that the above manuscript which is submitted for publication in the STM Journals(s), is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

  • I/We will not withdraw the manuscript after 1 week of submission as I have read the Author Guidelines and will adhere to the guidelines.
  • I/We Author(s ) have niether given nor will give this manuscript elsewhere for publishing after submitting in STM Journal(s).
  • I/ We have read the original version of the manuscript and am/ are responsible for the thought contents embodied in it. The work dealt in the manuscript is my/ our own, and my/ our individual contribution to this work is significant enough to qualify for authorship.
  •  I/We also agree to the authorship of the article in the following order:

Author’s name                                    

 

1. ________________

2. ________________

3. ________________

4. ________________

 

We  Author(s) tick this box and would request you to consider it as our signature as we agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal.