Sulfonated poly(1,3,4‐oxadiazole‐2,5‐diyl‐1,4‐phenyleneoxy‐1,4‐phenylene), poly(1,3,4‐oxadiazole‐2,5‐diyl‐10,10‐dioxophenoxathiine‐2,8‐diyl) and their copolymers were one‐pot synthesized in fuming sulfuric acid with the use of 4,4′‐oxydibenzoic acid and hydrazine sulfate as initial reagents. These copolymers were non‐fusible and did not dissolve in individual liquids except sulfuric acid. However, it was possible to achieve their unlimited solubility using a mixed solvent that contained dimethyl sulfoxide, formamide and water. In dilute and semi‐dilute solutions, the copolymers behaved like polyelectrolytes, while in concentrated solutions they formed gels; moreover, in the case of high polymer content, the gels were in a liquid crystalline state. The degree of sulfonation, temperature and water content in the mixed solvent influenced the state of copolymer solutions, their viscosity and viscoelasticity. The finding of the mixed solvent made it possible to form polymer films whose strength and heat resistance reached 33 MPa and 470 °C, respectively. The ionic conductivity of the films under direct current conditions was 0.001–0.01 μS cm^–1 for sodium cations and 0.3–1 mS cm^–1 for protons. © 2020 Society of Chemical Industry

中文翻译：

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磺化聚恶二唑的合成和加工成离子导电膜

磺化聚（1,3,4-恶二唑-2,5-二基-1,4-苯氧基-1,4-苯），聚（1,3,4-恶二唑-2,5-二基-10,10-使用4,4'-氧二苯甲酸和硫酸肼作为初始试剂，在发烟硫酸中一锅法合成二氧代苯氧并（2,8-二基）及其共聚物。这些共聚物是不可熔的，除了硫酸以外，它们不溶于各种液体。但是，使用含有二甲亚砜，甲酰胺和水的混合溶剂可以实现其无限的溶解性。在稀溶液和半稀溶液中，共聚物的行为类似于聚电解质，而在浓溶液中则形成凝胶。此外，在高聚合物含量的情况下，凝胶处于液晶状态。磺化度 混合溶剂中的温度和水含量影响共聚物溶液的状态，粘度和粘弹性。混合溶剂的发现使得可以形成强度和耐热性分别达到33 MPa和470°C的聚合物膜。直流条件下薄膜的离子电导率为0.001–0.01μScm^-1用于钠阳离子和0.3-1毫秒cm的^-1为质子。©2020化学工业协会