硅橡胶在模拟PEM燃料电池环境下的损伤机理

Degradation mechanism of silicone rubber in simulated PEM fuel cell environment

弹性体材料垫片作为PEM燃料电池中一个重要构件,长期服役在PEM燃料电池潮湿、偏酸性环境下,其化学损伤过程是如何演变的对于研究垫片材料的机械密封性能、预测垫片材料的寿命起着基础性作用。采用先进材料测试分析方法XPS技术研究了弹性体材料在模拟的燃料电池环境中的化学降解过程,从分子角度揭示了材料化学损伤的机理主要是材料分子主链的断裂、侧链的断裂及交联区的水解。

Elastomer material gasket as an important component works in proton exchange membrane (PEM) fuel cell under moist, acidic conditions. The evolution process of the material’s chemical degradation plays a fundamental role in studying the performance of mechanical seal gasket material and its life prediction. The chemical process of the elastomer material was analyzed by using X-ray photoelectron spectroscopy (XPS). The degradation mechanism was mainly molecular chain scission in the backbone and side chain and hydrolysis of crosslinking.