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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Characterization of Sulfonated Block Copolyimides Derived from 4,4 '-Sulfide-bis(naphthalic anhydride) for Proton Exchange Membranes
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Synthesis and Characterization of Sulfonated Block Copolyimides Derived from 4,4 '-Sulfide-bis(naphthalic anhydride) for Proton Exchange Membranes

机译：质子交换膜的4,4'-硫化物-双（萘酐）磺化嵌段共聚酰亚胺的合成与表征

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摘要

A series of sulfonated copolyimides (SPIs) with hydrophilic segment length of 20-60 based on 4,4-sulfide-bis(naphthalic anhydride) (SBNA) have been successfully synthesized to improve hydrolytic stability and proton conductivity. The SPI membranes were cast from their m-cresol solutions, and they were characterized by determining the water uptake, water swelling ratio, mechanical properties, hydrolytic stability, oxidative stability, and proton conductivity. It was found that the water uptake of SPI membranes was low and decreased as the hydrophilic segment length increased, which led to good dimensional stability. In addition, the SPI membranes with low ion-exchange capacity (IEC) value displayed excellent hydrolytic stability and retained good mechanical properties even after harsh hydrolysis testing, in which the block SPI with hydrophilic segment length of 40 had the best hydrolytic stability, while those with high IEC value showed an apparent decrease. All of the block SPI membranes show better conductivity than the random ones at the temperature range from 30 to 70 degrees C. Interestingly, the proton conductivities of random SPI membranes were higher than that of corresponding block ones at 90 degrees C. The block SPI with hydrophilic segment length of 40 gave the highest proton conductivity as the temperature increased among the block SPIs. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41501.
机译：已成功合成了一系列基于4,4-硫化物-双（萘二甲酸酐）（SBNA）的亲水段长度为20-60的磺化共聚酰亚胺（SPI），以提高水解稳定性和质子传导性。 SPI膜是从间甲酚溶液中浇铸而成的，它们的特征在于确定吸水率，溶胀率，机械性能，水解稳定性，氧化稳定性和质子传导率。发现SPI膜的吸水率低并且随着亲水链段长度的增加而降低，这导致良好的尺寸稳定性。此外，即使经过严格的水解测试，低离子交换容量（IEC）值的SPI膜仍具有出色的水解稳定性并保持良好的机械性能，其中亲水链段长度为40的嵌段SPI具有最佳的水解稳定性，而那些IEC值高时，显示明显降低。在30至70摄氏度的温度范围内，所有嵌段SPI膜的电导率均比随机膜好。有趣的是，随机SPI膜的质子电导率高于相应嵌段膜在90℃时的质子电导率。在嵌段SPI中，随着温度的升高，亲水链段长度为40时，质子传导率最高。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41501。

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