Preparation and Characterisation of Proton Exchange Membranes Based on Crosslinked Polybenzimidazole and Phosphoric Acid
Preparation and Characterisation of Proton Exchange Membranes Based on Crosslinked Polybenzimidazole and Phosphoric Acid
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DOI：
10.1002/fuce.201000071
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发表时间：
2010-12-01
期刊：
影响因子：
2.8
通讯作者：
Wan, D. C.
中科院分区：
文献类型：
--
作者：
Guan, Y. S.;Pu, H. T.;Wan, D. C.
交联聚苯并咪唑 (PBI) 通过 N-乙烯基咪唑和乙烯基苄基取代的 PBI 之间的自由基聚合合成。交联度随着交联剂含量的增加而增加。讨论了交联PBI和线性PBI的磷酸掺杂行为、力学性能、质子电导率和酸迁移稳定性。结果表明，随着PBI交联度的增加，酸掺杂能力降低。 PBI中引入N-乙烯基咪唑有利于其氧化稳定性。交联PBI/H3PO4膜的机械稳定性优于线性PBI/H3PO4膜。酸掺杂膜的质子电导率在150℃下可以达到与交联PBI/H3PO4复合膜相似的10(-4) S cm(-1)。酸掺杂膜的质子电导率的温度依赖性可以通过阿伦尼乌斯关系来建模。交联PBI/H3PO4复合膜的质子电导率略低于相同酸含量的线性PBI/H3PO4膜。然而，与线性PBI/H3PO4膜相比，交联PBI/H3PO4膜中H3PO4的迁移稳定性得到改善。
Crosslinked polybenzimidazole (PBI) was synthesised via free radical polymerisation between N-vinylimidazole and vinylbenzyl substituted PBI. The degree of crosslinking increases with increasing content of the crosslinker. The phosphoric acid doping behaviour, mechanical properties, proton conductivity and acid migration stability of crosslinked PBI and linear PBI are discussed. The results show that the acid doping ability decreases with increasing degree of crosslinking of PBI. The introduction of N-vinylimidazole in PBI is beneficial to its oxidation stability. The mechanical stability of crosslinked PBI/H3PO4 membrane is better than that of linear PBI/H3PO4 membrane. The proton conductivity of the acid doped membranes can reach similar to 10(-4) S cm(-1) for crosslinked PBI/H3PO4 composite membranes at 150 degrees C. The temperature dependence of proton conductivity of the acid doped membranes can be modelled by an Arrhenius relation. The proton conductivity of crosslinked PBI/H3PO4 composite membranes is a little lower than that of linear PBI/H3PO4 membranes with the same acid content. However, the migration stability of H3PO4 in crosslinked PBI/H3PO4 membranes is improved compared with that of linear PBI/H3PO4 membranes.