Showing papers by "Dipak Khastgir published in 2006"
TL;DR: In this article, the effect of different techniques on the electric properties (dielectric constant, dielectric losses, and complex electric modulus) of the corresponding emeraldine base has been studied.
172 citations
TL;DR: In this article, a stable miniemulsion of aniline was prepared using sodium dodecyl sulphate (SDS) as the surfactant and cetyl alcohol as the cosurfactant.
132 citations
TL;DR: In this article, flexible conductive polymer composites were prepared using styrene-butadiene rubber (SBR) as a matrix and conductive carbon black as filler, and filler loading was varied from 10 to 60 phr The complex AC impedance and electromagnetic interference shielding effectiveness (EMI SE) of the composites are measured at the microwave frequencies of 78-124 GHz.
Abstract: Flexible conductive polymer composites were prepared using styrene–butadiene rubber (SBR) as a matrix and conductive carbon black as filler The filler loading was varied from 10 to 60 phr The complex AC impedance and electromagnetic interference shielding effectiveness (EMI SE) of the composites were measured at the microwave frequencies of 78–124 GHz The effect of variation in filler concentration and measurement frequency on the AC impedance and EMI SE of the composites were investigated Equivalent circuits describing the conduction behavior of the composites were determined by means of Nyquist plots The complex electric modulus of the composites was also determined Increase in the filler loading increased the capacitive nature of the materials The composites were better defined by a parallel resistor–capacitor circuit in series with a resistor The EMI SE was found to pass through a maximum with increase in frequency However, with the increase in filler loading and sample thickness of the material, the EMI SE was found to increase continuously POLYM ENG SCI, 46:1342–1349, 2006 © 2006 Society of Plastics Engineers
50 citations
TL;DR: In this article, the kinetics of the thermal degradation and thermo-oxidative degradation of conductive styrene-butadiene rubber (SBR)-carbon black composites were investigated using thermogravimetric analysis both in nitrogen and oxygen atmospheres.
Abstract: The kinetics of the thermal degradation and thermo-oxidative degradation of conductive styrene-butadiene rubber (SBR)-carbon black composites were investigated using thermogravimetric analysis both in nitrogen and oxygen atmospheres. Experiments were carried out at heating rates of 5, 10, 15 and 20 °C/min in both the atmospheres. Friedman method, Kissinger method, Flynn–Wall–Ozawa method and Coats–Redfern method have been used to determine the activation energies of degradation. The invariant kinetic parameters using the IKP method were also determined. The results showed that the thermal stability of the composites in pure nitrogen is higher than that in air atmosphere and the increase in filler loading was found to increase the thermal stability in nitrogen atmosphere. The probable degradation mechanisms of the polymer in both the atmospheres were evaluated based on Fourier Transform Infra Red Spectroscopy (FT-IR) studies.
20 citations