热重法分析碱性锌锰电池尼龙密封圈的老化
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摘要
利用热重(TG)分析法对碱性锌锰(碱锰)电池的尼龙密封圈进行老化分析。在氮气气氛中,尼龙密封圈在40～800℃的热解过程可分为3个失重阶段。由Flynn-wall-Ozawa法求得未老化密封圈的热解活化能E_a为247～250 kJ/mol,指前因子A为8. 8×10~(18)/s。与由Coat-Redfern法得到的活化能值对比,确定尼龙密封圈的热解过程符合Malek机理,得到反应机理函数和反应级数。可通过一次简单测试求出不同状态下碱锰电池尼龙密封圈的E_a,评价材料的热稳定性及不同状态下尼龙密封圈的老化程度。5 a存储电池的密封圈E_a约在200 kJ/mol,可见密封圈未发生明显降解老化。
The aging analysis of nylon gasket in alkaline Zn/MnO_2 battery was researched by thermogravimetric( TG) analysis method. The thermal decomposition processes was divided into three stages in 40-800℃ in the nitrogen atmosphere. From Flynnwall-Ozawa methods,the thermal decomposition activation energy E_afor the decomposition reaction of the nylon gasket was 247-250 kJ/mol and the pre-exponential factor A was 8. 8 × 10~(18)/s. Compared with the activation energies obtained by Coat-Redfern method,the pyrolysis process of nylon gasket was conformed to Malek mechanism,the reaction mechanism function and reaction order were obtained. The E_adecomposition activation energy of nylon gasket in alkaline Zn/MnO_2 battery under different conditions could be obtained by a simple test,the E_astability of the materials and the aging degree of nylon gasket under different conditions was evaluated. The thermal decomposition activation energy of nylon gasket for 5 a stored battery was about 200 kJ/mol,which showed that the gasket was not degraded obviously.
The aging analysis of nylon gasket in alkaline Zn/MnO_2 battery was researched by thermogravimetric( TG) analysis method. The thermal decomposition processes was divided into three stages in 40-800℃ in the nitrogen atmosphere. From Flynnwall-Ozawa methods,the thermal decomposition activation energy E_afor the decomposition reaction of the nylon gasket was 247-250 kJ/mol and the pre-exponential factor A was 8. 8 × 10~(18)/s. Compared with the activation energies obtained by Coat-Redfern method,the pyrolysis process of nylon gasket was conformed to Malek mechanism,the reaction mechanism function and reaction order were obtained. The E_adecomposition activation energy of nylon gasket in alkaline Zn/MnO_2 battery under different conditions could be obtained by a simple test,the E_astability of the materials and the aging degree of nylon gasket under different conditions was evaluated. The thermal decomposition activation energy of nylon gasket for 5 a stored battery was about 200 kJ/mol,which showed that the gasket was not degraded obviously.
引文
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