Polymer nanofilms with enhanced microporosity by interfacial polymerization
Polymer nanofilms with enhanced microporosity by interfacial polymerization
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DOI：
10.1038/nmat4638
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发表时间：
2016-07-01
期刊：
影响因子：
41.2
通讯作者：
Livingston, Andrew G.
中科院分区：
文献类型：
--
作者：
Jimenez-Solomon, Maria F.;Song, Qilei;Livingston, Andrew G.
高渗透性和选择性膜是理想的节能气体和液体分离。微孔有机聚合物由于其高孔隙度、高渗透性和高分子选择性而引起了人们的广泛关注。然而，制造具有可控微孔隙度且在溶剂中稳定的选择性聚合物膜仍然具有挑战性。在这里，我们报告了一种通过操纵分子结构来设计具有增强微孔隙度的交联刚性聚合物纳米膜的新方法。通过界面聚合在原位形成厚度可达20nm的超薄聚芳酯纳米膜。通过分子模拟证明，通过使用扭曲单体进行界面聚合，可以增强分子间网络空隙的微孔隙度和更高的连通性。在交联聚酰亚胺超滤膜上原位制备具有增强微孔隙度的聚芳酯纳米膜的复合膜在有机溶剂中具有出色的分离性能，其溶剂渗透率比由非扭曲平面单体制备的纳米膜高两个数量级。
Highly permeable and selective membranes are desirable for energy-efficient gas and liquid separations. Microporous organic polymers have attracted significant attention in this respect owing to their high porosity, permeability and molecular selectivity. However, it remains challenging to fabricate selective polymer membranes with controlled microporosity that are stable in solvents. Here we report a new approach to designing crosslinked, rigid polymer nanofilms with enhanced microporosity by manipulating the molecular structure. Ultrathin polyarylate nanofilms with thickness down to 20 nm are formed in situ by interfacial polymerization. Enhanced microporosity and higher interconnectivity of intermolecular network voids, as rationalized by molecular simulations, are achieved by using contorted monomers for the interfacial polymerization. Composite membranes comprising polyarylate nanofilms with enhanced microporosity fabricated in situ on crosslinked polyimide ultrafiltration membranes show outstanding separation performance in organic solvents, with up to two orders of magnitude higher solvent permeance than membranes fabricated with nanofilms made from non-contorted planar monomers.