Relaxation behavior of conductive carbon black reinforced chlorosulfonated polyethylene composites

Abstract

Dynamic mechanical analysis and dielectric relaxation spectra of conductive carbon black reinforced chlorosulfonated polyethylene (CSM) composites were used to study their relaxation behavior as a function of temperature and frequency, respectively. A marginal increase in glass transition temperature has been observed upto 30 phr carbon black filled polymer composite, beyond which it decreases, which has been explained on the basis of aggregation of filler particles in the polymer matrix. The strain dependent dynamical parameters were evaluated at dynamic strain amplitudes of 0.1-200%. The nonlinearity in storage modulus increases with increase in filler loading. It can be explained on the basis of filler-polymer interaction and aggregation of the filler particulates. The frequency dependent dynamical mechanical analysis has also been studied at frequency range of 0.1-100 Hz. The variation in real and complex part of impedance with frequency has been studied as a function of filler loading. The effect of filler loading on ac conductivity has been observed as a function of frequency. An increase in conductivity value has been observed with increase in filler loading. This can be explained on the basis of formation of conducting paths between filler particulates.

Dielectric relaxation behavior of conducting carbon black reinforced ethylene acrylic elastomer vulcanizates

“…Beyond 20 phr CB loaded AEM composite, a continuous conductive path is developed due to close contact between the CB particles in the polymer matrix. This observation appears to be in good agreement with the electrical properties 35…”

Thermal, electrical, and mechanical properties of polyethylene–graphene nanocomposites obtained by in situ polymerization

“…The real part represents the bulk resistance (R b ), and the imaginary part represents the reactance arising from the capacitive or inductive nature of the system. 38 R b can be determined from the study of the variation of the impedance with frequency. The electrical conductivity of the polymeric film can be calculated by the following equation:…”

“…Percolation theory is based on the development of a conductive network formed by electron transport paths through the volume of the sample. 38 The electrical properties of polymer nanocomposites are strongly dependent on the distribution of the conductor filler in the polymer matrix. It is fundamental that filler particles contact each other to form conductive networks because these particles are dispersed on an insulating polymer matrix.…”

Interplay between key variables of peroxide cured EPDM and evaluation of electromechanical efficiency for MV cables

“…And it is observed in EPDM with 59% of ethylene, peroxide DTBPH at concentration of 60 g and higher, reaches the highest values. At mix of 75% of ethylene in EPDM with peroxide DTBPIB, its dielectric percolation plot can be resolved into three regions: (1) inductive region, which explains the decrease in resistivity at lower level of peroxide loadings, that at the virgin base matrix was due to transportation of the small number of charged particles through the system; (b) percolation region, which explains the increase in dielectric conductivity sharply due to the formation of continuous conductive networks in insulating material; (c) saturation region, which represents the upper part of the dielectric percolation plot explaining the marginal effect on electrical conductivity on further addition of conductive component . For peroxide DTBPIB the dielectric percolation limits moves further with increasing ethylene content of EPDM.…”