English Abstract

Analysis of Curing Process of Rubbers Using Oscillating Rheometer, Part 2. Kinetic Study on Peroxide Curing Process of Rubbers 1 Chugoku Rubber Industry Co.,Ltd.,Okayama,Japan. 2 Department of Systems Engineering, Okayama Prefectural University Okayama,Japan. Nippon Gomu Kyokaishi,(2003),76(5), 160-166 Original Paper in Japanese. Abstract The curing processes of EPDM, NBR, SBR, BR with various peroxides are estimated using an oscillating rheometer. It is difficult to treat the whole reaction process due to existence of induction period of reaction on the curing process of rubbers. In this paper, the active state of rubber was taken into the reaction model in order to cope with this problem. Consequently, relative cure states at arbitrary time has been presumed with sufficient accuracy. Moreover, it is elucidated that the temperature dependence of the apparent rate constants can be validly expressed with the Arrhenius equation, and obtained relations give not only the rate constants at arbitrary temperatures but also activation energies of radical production reactions. Therefore, the rate constants of curing processes with peroxide can be evaluated at arbitrary temperatures, and the curing processes can be analyzed even at unsteady temperature distributions in actual rubber products. Keywords: Oscillating rheometer, Curing curve, Kinetics, Rate constant, Peroxide, EPDM, Activation energy

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