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A Study on the Life Time Prediction and Acid-Heat aging Property of NBR Rubber for Fuel Cell Gasket  

Kim, Mi-Suk (School of Polymer Science & Engineering, Gyeongsang national University)
Kim, Jin-Hak (School of Polymer Science & Engineering, Gyeongsang national University)
Kim, Seok-Jin (R&D center, Dong-A Hwa Sung Co., Ltd.)
Kim, Jin-Kuk (School of Polymer Science & Engineering, Gyeongsang national University)
Publication Information
Elastomers and Composites / v.42, no.1, 2007 , pp. 20-31 More about this Journal
Abstract
Material characteristics and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. In this paper, the NBR compound was prepared by sulfur-cure system, and was used in predicting the lifetime of rubber gasket made by the compound. The accelerated material aging was investigated at different temperatures at 120, 140 and $160^{\circ}C$ and aging time from 3 hours to 600 hours at 5, 6, 7 vol %. of $H_2SO_4$ concentrations The rubber strips were placed in acid solution using pyrex g1ass tube. Both ends of pyrex g1ass tube were sealed to avoid evaporation of solution during heating at given time. The material test and accelerated acid-heat aging test were carried out to predict the useful life of NBR rubber gasket for a fuel cell stack. In order to investigate the effects of acid-heat aging on the properties of the NBR, tensile strength, elongation at break, hardness and crosslink-density were measured. The tensile strength decreases as the $H_2SO_4$ concentrations and temperature increase. Results were evaluated using Arrhenius equation.
Keywords
Life time prediction; Fuel cell gasket; NBR; Arrhenius equation;
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