Localized Deep and Shallow Traps of α-Peaks from Thermally Stimulated Current (TSC) Measurement on Thermoplastic Polymers

Abstract:

In this paper, trap levels around the glass transition temperature (T_g) of polymers have been characterized using Thermally Stimulated Current (TSC) technique. Deconvolution on α-peaks of the T_g for PE (-104 °C), plasticized PVC (-35 °C), PMMA (90 °C) and PET (96 °C) were carried out based on the first-order kinetic theory for non-Debye relaxation. Using temperature, T from TSC experimental data, we have successfully separated the α-peaks of the thermoplastic polymers. It is found that the complex curve of α-peaks can composed of four (4) to eight (8) sub peaks. Dominant sub peaks were identified at T_max = -105 °C, -34 °C, 89 °C and 92 °C for PE, pPVC, PMMA and PET, respectively. These peaks show activation energy, E_a of shallow and deep trap centers ranged from 0.3 eV to 4.6 Ev where they represent the depolarization of localized dipoles and space charges relaxations in the polymers.

• Periodical: Solid State Phenomena (Volume 317)
• Pages: 369-376
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.317.369
• Online since: May 2021
• Authors: Norhana Abdul Halim*, Siti Zulaikha Ngah Demon, Norli Abdullah, Nurazlin Ahmad, Zul Hazrin Zainal Abidin
• Keywords: Activation Energy, Deconvolution, Dipoles, PE, PET, Plasticized PVC, PMMA, Relaxation, Space Charge, Thermally Stimulated Current

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