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Effects of adjacent groups of benzimidazole on antioxidation of polybenzimidazoles

机译：邻苯并咪唑基团对聚苯并咪唑类化合物抗氧化作用的影响

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摘要

The chemical oxidative stabilities of poly(2,2-(m-phenylene)-5,5-bibenzimidazole) (PBI-ph), poly(2,5-benzimidazole) (ABPBI), poly(2,2'-hexyl-5,5'-bibenzimidazole) (PBI-hex), and poly(2,2'-imidazole-5,5'-bibenzimidazole) (PBl-imi) are studied. By means of FTIR and 'HNMR analysis, more information about the degradation process of PBI-ph is found as: CH2 groups are left in the residual polymers; after the N-H bond and the trisubstituted benzene ring are oxidized by oxidative free radicals, the meta-phenylene is relatively stable. Through Fenton tests, the chemical oxidative stabilities of these PBIs are compared and results show that PBI-ph is the stablest material while PBI-imi is the unstablest one. Through FTIR analysis, the structure changes to those degraded PBIs are compared. The conjugated structure formed between meta-phenyl and benzimidazole can protect the main chain of PBI-ph from the attack of oxidative free radicals. Additionally, effects of acid on PBI-ph degradation rate are evaluated and the results show that phosphoric acid can slow down the chemical oxidative degradation.
机译：聚（2,2-（间亚苯基）-5,5-联苯并咪唑）（PBI-ph），聚（2,5-苯并咪唑）（ABPBI），聚（2,2'-己基-研究了5,5'-联苯并咪唑（PBI-hex）和聚（2,2'-咪唑-5,5'-联苯并咪唑）（PB1-imi）。通过FTIR和1HNMR分析，发现关于PBI-ph的降解过程的更多信息为：CH 2基团残留在残余聚合物中；在N-H键和三取代苯环被氧化性自由基氧化后，间亚苯基相对稳定。通过Fenton测试，比较了这些PBI的化学氧化稳定性，结果表明PBI-ph是最稳定的物质，而PBI-imi是最不稳定的物质。通过FTIR分析，比较了降解的PBI的结构变化。在间苯基与苯并咪唑之间形成的共轭结构可以保护PBI-ph的主链免受氧化自由基的攻击。此外，评估了酸对PBI-ph降解速率的影响，结果表明磷酸可以减缓化学氧化降解。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第12期|p.2648-2653|共6页
  • 作者

    Zhihong Chang; Hongting Pu; Decheng Wan; Ming Jin; Haiyan Pan;

  • 作者单位

    Institute of Functional Polymers, School of Materials Science & Engineering, Tongji University, Shanghai 200092, China;

    Institute of Functional Polymers, School of Materials Science & Engineering, Tongji University, Shanghai 200092, China;

    Institute of Functional Polymers, School of Materials Science & Engineering, Tongji University, Shanghai 200092, China;

    Institute of Functional Polymers, School of Materials Science & Engineering, Tongji University, Shanghai 200092, China;

    Institute of Functional Polymers, School of Materials Science & Engineering, Tongji University, Shanghai 200092, China;

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  • 正文语种 eng
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  • 关键词

    polybenzimidazole; degradation; proton exchange membrane; oxidation; polymer electrolyte membrane fuel cells;

    机译：聚苯并咪唑降解;质子交换膜氧化高分子电解质膜燃料电池;

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