Electret transitions of peroxide-cured nitrile-butadiene rubber

Abstract

All of the cured (cross-linked) polymers we studied have a pair of electret transition peaks separated by 20 to 60° C. The lower temperature current peak is clearly due to the glass-rubber transition in each case and the upper peak has always behaved as a so called ^" ρ-transition." The latter is said to be associated with charge drift that is limited by space charge, diffusion of excess charges, ohmic conduction, and/or Maxwell-Wagner polarization. This paper will present and discuss data illustrating the use of electrode materials and swelling in the study of these "ρ-transitions.".