通过共混法将木质素磺酸钠(SLS)引入到磺化聚酰亚胺(SPI)中,制备了SPI/SLS质子交换复合膜。通过红外光谱(FT-IR)和扫描电镜(SEM)表征复合膜的化学结构和微观形貌,并对复合膜的含水率、溶胀度、机械性能、热稳定性和质子传导性能进行研究。结果表明:SLS均匀分散在SPI内部,SLS的引入提升了质子交换复合膜的热稳定性。SPI/SLS-15复合膜的拉伸强度为49.1MPa,是Nafion117膜的1.84倍。复合膜的质子电导率随SLS含量的增加而增加,SPI/SLS-15质子交换复合膜的质子电导率最高,在90℃水中达到0.329S/cm。SLS增加了复合膜的保水性和质子传输位点,使复合膜的质子电导率有很大提升。
Sodium lignosulfonate (SLS) was doped into sulfonated polyimide (SPI) by blending method.The SPI/SLS proton exchange composite membrane was successfully prepared.The chemical structures and micro morphology of the membranes were characterized by FT-IR and SEM.The water uptake,swelling degree,mechanical properties,thermal stability and proton conductivity of the membranes were investigated.The results showed that the SLS was uniformly dispersed in the SPI.The thermal stability of the membranes was improved by the doping of SLS.The tensile strength of SPI/SLS-15 membrane was 49.1MPa,which was 1.84 times that of Nafion117 membrane.The proton conductivity of the membranes increased with the increase of SLS.The SPI/SLS-15 membrane had the highest proton conductivity of 0.329S/cm at 90℃ in water.SLS increased the water retention and proton transport sites of the membranes,which increased the proton conductivity of the membranes.
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基金资助
国家自然科学基金(21306012);江苏省高校优势学科建设项目(PAPD);江苏省精细石油化工重点实验室开放课题基金资助项目(KF2106)
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