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首页> 外文期刊>Journal of Applied Polymer Science >Novel Sulfonated Polyimide Ionomers by Incorporating Pyridine Functional Group in the Polymer Backbone
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Novel Sulfonated Polyimide Ionomers by Incorporating Pyridine Functional Group in the Polymer Backbone

机译：通过在聚合物主链中掺入吡啶官能团的新型磺化聚酰亚胺离聚物

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摘要

A series of sulfonated polyimides (SPIs) containing pyridine ring in the polymer backbone were synthesized by the polycondensation of 1,4,5,8-naphthalene-tetracarboxylic dianhydride (NTDA), 5-(2,6-bis(4-arninophenyl)pyridin-4-yl)-2-methoxy benzene sulfonic acid (SDAM), and 4,4'-diaminodiphenyl ether (ODA). Flexible, transparent, and tough membranes were obtained. Property study revealed that all the membranes displayed high thermal stability with the desulfonation and decomposition temperature higher than 290 and 540 degrees C, respectively, as well as good mechanical property with Young's modulus larger than 1.0 GPa, maximum strength (MS) on a scale of 60-80 MPa, and elongation at break (EB) ranged from 41.79 to 75.17%. More importantly, the new materials exhibited small water uptake and excellent dimensional stability with the highest sulfonated SPI-80 showing the maximum water uptake of 36.1%, and maximum swollen ratio of Delta t = 0.038 and Delta l = 0.026, respectively (Delta t and Delta l stands for the thickness and diameter change of the film, respectively). The high water stability exhibited by the SPI films is attributed to the formation of inner salts and/or ionic crosslinking between the sulfonic acid and pyridine functional groups, which suppresses the water uptake ability of sulfonic acid and strengthened the interpolymer chain interactions. Thus, the excellent water stability, good thermal and mechanical properties, and the technologically applicable conductivity of SPI-80 render this material attractive for proton exchange membrane (PEM) application.
机译：通过1,4,5,8-萘-四甲酸二酐（NTDA），5-（2,6-双（4-阿氨基）苯基）的缩聚反应合成了一系列在聚合物主链中包含吡啶环的磺化聚酰亚胺（SPI）。吡啶-4-基）-2-甲氧基苯磺酸（SDAM）和4,4'-二氨基二苯醚（ODA）。获得了柔性，透明和坚韧的膜。性能研究表明，所有膜在脱硫和分解温度分别高于290和540℃时均显示出高热稳定性，并且杨氏模量大于1.0 GPa时具有良好的机械性能，最大强度（MS）约为60-80 MPa，断裂伸长率（EB）为41.79至75.17％。更重要的是，新材料显示出较小的吸水率和出色的尺寸稳定性，其中磺化度最高的SPI-80表现出最大吸水率36.1％，最大溶胀率分别为Delta t = 0.038和Delta l = 0.026（Delta t和0.026）。 Δl分别代表膜的厚度和直径变化。 SPI膜表现出的高水稳定性归因于磺酸和吡啶官能团之间的内盐形成和/或离子交联，从而抑制了磺酸的吸水能力并增强了共聚物链间的相互作用。因此，优异的水稳定性，良好的热和机械性能以及SPI-80的技术适用导电性使该材料吸引质子交换膜（PEM）应用。

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