화학공학소재연구정보센터
Macromolecular Research, Vol.15, No.4, 315-323, June, 2007
Life Time Prediction of Rubber Gasket for Fuel Cell through Its Acid-Aging Characteristics
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The present manuscript deals with the prediction of the lifetime of NBR compound based rubber gaskets for use as fuel cells. The material was investigated at 120, 140 and 160 ℃, with aging times from 3 to 600 h and increasing H2SO4 concentrations of 5, 6, 7 and 10 vol%. Both material and accelerated acid-heat aging tests were carried out to predict the useful life of the NBR rubber gasket for use as a fuel cell stack. To investigate the effects of acid-heat aging on the performance characteristics of the gaskets, the properties of the NBR rubber, such as cross-link density and elongation at break, were studied. The hardness of the NBR rubber was found to decrease with decreasing acid concentration at both 120 and 140 ℃, but at 160 ℃, the hardness of the NBR rubber increased abruptly in a very short time at different acid concentrations. The tensile strength and elongation at break were found to decrease with increases in both the H2SO4 concentration & temperature. The observed experimental results were evaluated using the Arrhenius equation.
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