期刊Study of dielectric relaxation behavior of electron beam-cured conductive carbon black-filled ethylene acrylic.pdfVIP

J Mater Sci (2013) 48:702–713 DOI 10.1007/s10853-012-6782-7 Study of dielectric relaxation behavior of electron beam-cured conductive carbon black-filled ethylene acrylic elastomer Bibhu Prasad Sahoo • Kinsuk Naskar • K. Abhinav Dubey • Ram N. P. Choudhary • Deba Kumar Tripathy Received: 29 May 2012 / Accepted: 30 July 2012 / Published online: 16 August 2012 Springer Science+Business Media, LLC 2012 Abstract Composites based on ethylene acrylic elasto- explained on the basis of interfacial polarization. Based on mer (AEM) filled with a special type of conductive carbon dielectric loss tangent (tan d) values, it is observed that the black (CCB) have been prepared by two-roll mixing mill. dielectric relaxation time decreases with increases in the The compression-molded sheet of the prepared composites filler loading and temperature. However, it increases with have been subjected to electron beam (EB) radiation dose increase in the radiation doses. Both the real and imaginary up to 400 kGy to induce radiation crosslinked composites. parts of the impedance (Z0 00 and Z ) have been found to The crosslinked density has been calculated according to decrease with increase in conductive filler loading. The AC Flory–Rehner equation and is found to increase with conductivity (rac) increases with increase in the CCB increasing EB dose and CCB loading. Chain scission-to- concentration, test temperature, and radiation doses, which crosslink density has been calculated by Charlesby–Pinner is attributed to the more pronounced hopping and tunneling equation, which shows decreasing trend with increasing mechanism. The perc