Journal :   Asian Journal of Research in Chemistry

Volume No. :   5

Issue No. :  2

Year :  2012

Pages :   187-190

ISSN Print :  0974-4169

ISSN Online :  0974-4150


Registration

Allready Registrered
Click to Login

Dielectric Relaxation Behaviour and AC Conductivity of Vinylpropionate and Ethylmethacrylate (VP-EMA) copolymers



Address:   A. Narender* and G. Sathaia
Department of Physics, Kakatiaya University, Warangal- A.P. -506009
Corresponding author
DOI No:

ABSTRACT:
A systematic measurement of dielectric constant (e) and dielectric loss (tand) on powder pressed pellets of VP-EMA copolymer in composition 50/50 have been carried out in the frequency range 200Hz -100kHz and in the temperature range from room temperature to 180oC, covering through the glass transition Tg. Two sets of relaxation peaks on slight above room temperature and the other slightly above Tg are noticed from tand versus temperature curves for different frequencies. The peaks are attributed to ß and a- relaxations. Temperature coefficient of dielectric constant (TCe) is evaluated to understand the nature of the temperature dependence. AC conductivity is evaluated to understand the conduction process. Activation energy is calculated from loss (tand) versus temperature curves and log?p versus reciprocal temperature curves. Activation energy is also calculated from Arrehenius plots.
KEYWORDS:
Dielectric constant, dielectric loss, AC conductivity, Activation energy.
Cite:
A. Narender, G. Sathaia. Dielectric Relaxation Behaviour and AC Conductivity of Vinylpropionate and Ethylmethacrylate (VP-EMA) copolymers. Asian J. Research Chem. 5(2): February 2012; Page 187-190.
[View HTML]      [View PDF]



Visitor's No. :   120992