Title: INFLUENCE OF GAMMA-RADIATION ON THE ELECTRICAL CONDUCTANCE OF NR/IIR CONDUCTIVE BLEND DURING SWELLING IN KEROSENE
Page Range: p.243-254
Author(s): Madani M
File size: 122K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 3
Abstract
A study is reported on the influence of gamma-irradiation on the electrical conductance of a natural rubber-butyl rubber blend, filled with differing concentrations of general purpose furnace carbon black, during swelling in kerosene. The degree of swelling and the penetration rate in kerosene for the blends are also studied as a function of the irradiation dose. An attempt was made to calculate the carbon-carbon interspacing distance and its dependence on solvent penetration rate for un-irradiated, as well as irradiated samples. It was concluded that the addition of carbon black by different concentration to the rubber blend caused a dramatic increase in its conductance value by several orders of magnitude, moreover, the percolation threshold is detected at 30 phr of GPF. The degree of swelling, as well as conductance values for all un-irradiated and irradiated composites were highly affected with swelling time up to a characteristic value, indicating a destruction of carbon black structure in the bulk of the rubber matrix. The electrical conductance and the penetration rate values decreased with irradiation according to the excitation of rubber molecules, chemical bond rupture and creation of free radicals which randomly recombine. The calculated interspacing gaps values for all composites showed an exponential growth function with time. 29 refs.
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