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臭氧浓度对HTV硅橡胶材料的老化作用

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Keywords: HTV硅橡胶,臭氧浓度,老化,憎水性,热刺激电流(TSC),微观分析

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Abstract:

为了研究电晕放电过程中所产生的臭氧对高温硫化(HTV)硅橡胶老化作用的影响,利用研制的臭氧老化试验装置,考虑臭氧浓度及作用时间等因素,对HTV硅橡胶复合绝缘子试样进行了系统的臭氧老化试验,并且对老化后的试样进行了扫描电镜(SEM)、傅里叶红外光谱(FTIR)分析、憎水性和热刺激电流(TSC)测试。试验结果表明,臭氧能够导致硅橡胶材料表面缺陷增多,憎水性丧失,而且浓度越高,老化会越严重。进一步分析得出,硅橡胶材料在臭氧环境作用下,材料表面平滑、致密的物理结构被破坏,产生了孔洞等缺陷,并且当臭氧环境作用强度达到一定程度后,材料的物理结构的破坏将更为严重;同时,化学基团含量发生变化,试样中Si-O-Si结构减少,羟基和Si-O键增多,试样主链和侧链断裂。

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