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采用高温一步法合成了一系列不同磺化度的三元共聚磺化聚酰亚胺(SPI),通过控制磺化二胺与非磺化二胺的摩尔比来调节磺化度.选取碱性聚合物聚乙烯吡咯烷酮(PVP)与SPI按质量比1∶9进行共混,制成SPI/PVP酸碱复合膜.对复合膜的吸水率、离子交换容量、钒离子渗透率以及电池性能进行了测试.结果表明,随着磺化度的升高,复合膜的吸水率、离子交换容量、质子电导率升高以及钒离子渗透率升高.复合膜的隔膜选择性比Nafion117的选择性好,其中SPI/PVP-3的选择性是Nafion117的10倍.电池性能测试表明,随磺化度的升高,复合膜能量效率升高.其中SPI/PVP-3膜较Nafion117膜具有较高的库伦效率和能量效率,通过循环测试SPI/PVP-3膜性能稳定,充放电理想.
A series of ternary copolymerized sulfonated polyimides (SPI) with different degree of sulfonation were synthesized by high temperature one-step process, and the degree of sulfonation was adjusted by controlling the molar ratio of sulfonated diamine to non-sulfonated diamine. Polyvinylpyrrolidone (PVP) and SPI were blended at a mass ratio of 1: 9 to prepare SPI / PVP acid-base composite membrane.The water absorption, ion exchange capacity, vanadium ion permeability and battery performance of the composite membrane were investigated The results showed that with the increase of sulfonation degree, the water absorption, ion exchange capacity, proton conductivity and vanadium ion permeability of the composite membranes increased.The membrane selectivity of composite membranes was better than that of Nafion117, Among them, the selectivity of SPI / PVP-3 was 10 times that of Nafion 117. The battery performance test showed that the energy efficiency of the composite membrane increased with the increase of sulfonation degree.The SPI / PVP-3 membrane had higher coulomb Efficiency and energy efficiency, through the cycle test SPI / PVP-3 film stable performance, ideal charge and discharge.