Thermal degradation of Acrylonitrile butadiene rubber(NBR), which is used for 0-ring material as elastomeric sealed diaphragm valve in the nuclear power plants, is examined. The thermal degradation is accelerated at l30℃ by Arrhenius exploit method ...
Thermal degradation of Acrylonitrile butadiene rubber(NBR), which is used for 0-ring material as elastomeric sealed diaphragm valve in the nuclear power plants, is examined. The thermal degradation is accelerated at l30℃ by Arrhenius exploit method using the activation energy calculated by thennogravimetric analysis. The weight loss temperature and glass transition temperature are verified for thermally aged NBR The relationship between dynamic mechanical properties and elongation at break are also investigated. The threshold value of thermally aged NBR is a ten year in the change of elongation at break.