Abstract Nafion®, a highly hydrophilic polymer, is potentially usable for water - organic and hydrophilic organic - hydrophobic organic membrane separations. Since Nafion has accessible sulfo groups in its structure, we propose modifying it with primary amines and did so with aniline, benzylamine and ethanolamine. The resulting modifications contained ionic and sulfonamide bonds, as these were detected using Fourier transform infrared (FTIR) spectrometry. To quantify the separation characteristics of the amine-modified Nafion membranes, vapour sorption microgravimetry and pervaporation experiments were made. The vapour sorption tests showed that amine-modified Nafions sorb ca. 2–4 times less methanol, water and dimethyl carbonate vapours than pure Nafion. Importantly, pervaporation experiments made with methanol-dimethyl carbonate mixtures showed that Nafion modified with ethanolamine is approximately twice as selective to methanol as pure Nafion, the sodium salt of Nafion and Nafion modified with benzylamine.

中文翻译：

---

用伯胺改性的 Nafion®：甲醇-碳酸二甲酯混合物的化学结构、吸附特性和渗透蒸发分离

摘要 Nafion® 是一种高度亲水的聚合物，可用于水-有机和亲水有机-疏水有机膜分离。由于 Nafion 在其结构中具有可接近的磺基，我们建议用伯胺对其进行改性，并用苯胺、苄胺和乙醇胺进行改性。得到的修饰包含离子键和磺酰胺键，因为这些是使用傅立叶变换红外 (FTIR) 光谱法检测到的。为了量化胺改性 Nafion 膜的分离特性，进行了蒸汽吸附微重力分析和渗透蒸发实验。蒸汽吸附试验表明，胺改性的 Nafions 吸附约。甲醇、水和碳酸二甲酯蒸气比纯 Nafion 少 2-4 倍。重要的，