Study of the Thermally Stimulated Depolarization Current (TSDC) for composites of Acrylonitrile Butadiene Rubber (NBR) loaded with HAF

Document Type: Regular Paper

Authors

1 Physics Department, Faculty of Science, Cairo University, Cairo, Egypt

2 Basic Engineering Science Department, Faculty of Engineering, Menofia University, Shebin El-Kom, Egypt

3 Cairo University

Abstract

The thermally stimulated discharge (TSDC) current is studied for acrylonitrile butadiene rubber (NBR) loaded
with different high abrasion furnace carbon black (HAF). TSDC peak appears only for higher HAF contents >
60phr (70 and 80phr of HAF contents), the TSDC spectra consist of a sharp peak corresponding to a peak
temperature
Tm
which is slightly shifted to higher temperature for 70phr loaded NBR samples and to lower
temperature for 80phr loaded NBR sample, with poling field (10V/cm to 50V/cm). The activation energy
 
 
U
and
relaxation time
 
 
for TSDC peak were calculated using the initial rise method. The calculated values of U
are
nearly constant for sample 70phr and slightly increase for sample 80phr with increasing poling field
 
 
Ep
. The
calculated values of
 
 
at peak temperature Tm
are nearly constant for two samples (70phr & 80phr) with different
poling field, whereas the calculated values of relaxation time
 
 
at To
= 300K increased with increase of poling
field.
 
 

Keywords