For commercial use, separating membranes need to have outstanding chemical, thermal, and mechanical stability. Moreover, striking a compromise between selectivity and permeability is essential for commercialization. Motivated by the robust and extensible properties of plant cell walls， we develop a strategy to build a cavity cell structure on the surface of the polydimethylsiloxane (PDMS) membrane utilizing a styrene-butadiene-styrene block copolymer (SBS) phase as the “cell wall" to enhance mechanical properties and prevent water permeation to achieve high selectivity. To obtain a controlled split-phase structure, γ-methacryloxy propyl trimethoxyl silane (WD-70) was selected for in situ accommodation of PDMS and SBS. The best results were achieved during the pervaporation separation of 1 wt % -butanol aqueous solution at 70 °C, with 67.86 μm•kg/(m•h) flux and an ultra-high separation factor of 73.6, as well as long-term operating stability. All the raw ingredients are affordable and readily available. The synergistic effect of PDMS and SBS mitigated the trade-off effect of the polymer membrane and improved the separation performance.

中文翻译：

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原位反应增容剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷制备聚二甲基硅氧烷/聚(苯乙烯-丁二烯-苯乙烯)共混膜用于高效回收水溶液中的正丁醇

对于商业用途，分离膜需要具有出色的化学、热和机械稳定性。此外，在选择性和渗透性之间达成折衷对于商业化至关重要。受植物细胞壁坚固且可扩展特性的启发，我们开发了一种策略，利用苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）相作为“细胞壁”，在聚二甲基硅氧烷（PDMS）膜表面构建空腔细胞结构。 ”以增强机械性能并防止水渗透以实现高选择性。为了获得受控的分相结构，选择γ-甲基丙烯酰氧基丙基三甲氧基硅烷（WD-70）原位容纳PDMS和SBS，取得了最佳效果在70℃下对1wt%正丁醇水溶液进行渗透汽化分离时，通量达到67.86μm•kg/(m•h)，超高分离因子73.6，并具有长期运行稳定性。 PDMS和SBS的协同作用减轻了聚合物膜的权衡效应，提高了分离性能。