Abstract Polymeric membranes, compared with their inorganic counterparts, usually suffer from insufficient solvent resistance and thermal stability. In this study, an organic solvent–resistant thermally stable polymeric microfiltration membrane is prepared with a self-crosslinkable polybenzoxazine as a precursor. The obtained membranes have pore sizes of approximately 3.4 µm and superior antiswelling stability in organic solvents; thus, they exhibit excellent performance in terms of size-selective particle separation inorganic phases. The membranes are also effective in the gravity-driven separation of surfactant-stabilized water-in-oil emulsions. The water contents of the filtrate oil phases are close to the natural solubility of water in the solvents; for example, a water content of 350 ppm, which is comparable to the water solubility in toluene (330 ppm), has been found in the filtrate toluene from water-in-toluene emulsions. Moreover, the membrane demonstrates pH-induced changes in oil and water selectivity in oil–water separations. When treated with a strong base solution, the oil-selective membrane becomes water-selective and exhibits favorable performance in terms of separating organic solvents from surfactant-stabilized oil-in-water emulsions. These features effectively extend the application scope of the prepared membrane for oil–water separations.

中文翻译：

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基于交联聚苯并恶嗪的耐有机溶剂和热稳定聚合物微滤膜，用于油水乳液的尺寸选择性颗粒分离和重力驱动分离

摘要 与无机膜相比，聚合物膜通常存在耐溶剂性和热稳定性不足的问题。在这项研究中，以可自交联的聚苯并恶嗪为前体制备了一种耐有机溶剂的热稳定聚合物微滤膜。所得膜的孔径约为 3.4 µm，在有机溶剂中具有优异的抗溶胀稳定性；因此，它们在尺寸选择性颗粒分离无机相方面表现出优异的性能。该膜在重力驱动分离表面活性剂稳定的油包水乳液方面也很有效。滤液油相的含水量接近水在溶剂中的自然溶解度；例如，含水量为 350 ppm，已经在来自甲苯包水乳液的滤液甲苯中发现了与甲苯中的水溶性（330 ppm）相当。此外，该膜显示了油水分离中油和水选择性的 pH 值变化。当用强碱溶液处理时，油选择性膜变得对水具有选择性，并且在从表面活性剂稳定的水包油乳液中分离有机溶剂方面表现出良好的性能。这些特点有效地扩展了制备的油水分离膜的应用范围。油选择性膜变得对水具有选择性，并在从表面活性剂稳定的水包油乳液中分离有机溶剂方面表现出良好的性能。这些特点有效地扩展了制备的油水分离膜的应用范围。油选择性膜变得对水具有选择性，并在从表面活性剂稳定的水包油乳液中分离有机溶剂方面表现出良好的性能。这些特点有效地扩展了制备的油水分离膜的应用范围。