Abstract

Abstract The dependence of the quantity of gel rubber on the extraction temperature was studied, for black-filled natural rubber compounds. Results show that the logarithm of the specific rubber gel quantity increases linearly with the reciprocal of the absolute temperature within a range of 25 to 80° C. The adsorption energies were calculated on the basis of the temperature dependence. The low energy values determined in this fashion supported the assumption that the bondings of the gel structure are largely “weak” bonds of a physical character. The author seeks to explain the observed adsorption phenomena by certain hypotheses.

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