Abstract

Sulfonated copolymers of 1,3,4-oxadiazole, diphenyl oxide, and 10,10-dioxophenoxathiine are obtained for use as polymer superabsorbents. The one-pot synthesis of the copolymers is carried out in an oleum medium, with the starting reagents being 4,4'-oxydibenzoic acid and hydrazine sulfate. As a result, the copolymers are obtained with the same proportion of the oxadiazole fragment in the chain but different ratio of fragments containing sulfonic acid groups: diphenyl oxide fragments with two sulfonic acid groups and dioxophenoxathiine fragments with one sulfonic acid group and one sulfonyl group. The copolymers are capable of a 100-fold swelling in an aqueous medium and dissolving to a limited extent upon the addition of polar aprotic cosolvents or with an increase in pH. The ratio of sulfonic acid and sulfonyl groups in the composition of the copolymer influences its swelling in water and the viscoelasticity of hydrogels that are in the mesophase state in case of a high content of the copolymer.

中文翻译：

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恶二唑，二氧代苯氧嘧啶和二苯醚的磺化共聚物的合成及性能

摘要

获得了1,3,4-恶二唑，二苯醚和10,10-二氧代苯氧嘧啶的磺化共聚物，用作聚合物超吸收剂。所述共聚物的一锅法合成在发烟硫酸介质中进行，起始试剂为4,4'-氧二苯甲酸和硫酸肼。结果，得到的共聚物在链中具有相同比例的恶二唑片段，但具有不同比例的含磺酸基的片段：具有两个磺酸基的二苯醚片段和具有一个磺酸基和一个磺酰基的二氧代苯氧嘧啶片段。该共聚物能够在水性介质中溶胀100倍，并在添加极性非质子助溶剂或pH升高的情况下溶解至一定程度。