The use of perovskite-type layered oxide K2La2Ti3O10 (Per) as a modifier of the Torlon® polyamide-imide (PAI) membrane has led to the formation of an specific structure of a dense nonsymmetrical film, namely, a thin perovskite-enriched layer (3–5 μm) combined with the polymer matrix (~30 μm). The PAI/Per membrane structure was studied by SEM in combination with energy dispersive microanalysis of the elemental composition which illustrated different compositions of top and bottom surfaces of the perovskite-containing membranes. Measurement of water and alcohol contact angles and calculation of surface tension revealed hydrophilization of the membrane surface enriched with perovskite. The transport properties of the nonsymmetrical PAI/Per membranes were studied in the pervaporation of ethanol‒ethyl acetate mixture. The inclusion of 2 wt.% Per in the PAI gives a membrane with a high separation factor and increased total flux.

中文翻译：

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基于 Torlon®（聚酰胺-酰亚胺）/层状钙钛矿氧化物的复合膜的特定结构和性能

使用钙钛矿型层状氧化物 K2La2Ti3O10 (Per) 作为 Torlon® 聚酰胺-酰亚胺 (PAI) 膜的改性剂，导致形成了致密的非对称薄膜的特定结构，即薄的钙钛矿富集层（ 3–5 μm) 与聚合物基质 (~30 μm) 结合。PAI/Per 膜结构通过 SEM 结合元素组成的能量色散微量分析进行研究，该分析说明了含钙钛矿膜的顶面和底面的不同组成。水和醇接触角的测量和表面张力的计算揭示了富含钙钛矿的膜表面的亲水化。在乙醇-乙酸乙酯混合物的渗透蒸发中研究了非对称 PAI/Per 膜的传输特性。包含 2 重量。