Document Type : Original Article
Authors
1
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
2
Department of Basic Science, Delta Higher Institute for Engineering and Technology, 11152 Mansoura, Egypt
3
Dept. of Physics, College of Science, Princess Nourah bint Abdulrahman University, Ryiadh, Saudi Arabia
4
physics, faculty of science and humanities studies, prince Sattam bin Abdulaziz university, Alkharj, Saudi Arabia
5
Chemistry Department, College of Science and Humanities, Prince Sattam bin Abdulaziz University, 11942 Al-Kharj
Abstract
Dielectric measurements of chitosan/PVA polymer blends were performed at various temperatures in a wide frequency range. Higher values of / and // at higher temperatures and lower frequencies are correlated to interfacial polarization (IP) and DC conduction, respectively. Isochronal behavior of // against temperature revealed that chitosan and PVA is characterized by a dipolar relaxation peak at T= 393 K and 348 K, respectively. The activation energy (Ea) values of conduction have been estimated for all samples. Cole-Cole behavior revealed that, with increasing the temperature the semicircles area of the samples increased and the semicircle intercept are shifted towards higher value of / indicating that, the capacitance is increased. Complex electric modulus (M*) of all samples is investigated and it is found that, real part (M/) of the complex electric modulus showed nonlinear behavior with frequency, whereas, (M//), i.e., the imaginary part, is characterized by a relaxation peaks for all samples. The scaling behavior has been carried out at T= 333 K, as a representative temperature and it is found that, all the curves are overlapped leading to a master curve indicating that, dynamic process is temperature independent.
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