rigid and polar oxalylurea unit in the bridges, were employed as precursors of bridged silica membranes. The gas and water separation performance of the membranes prepared from the precursors using the sol–gel process was investigated. Interestingly, the membrane properties depended on the alkyl chain length. The membrane containing methylene units (alkyl = methyl) was porous and rather hydrophilic but
两种新的桥联烷氧基
硅烷,双(三乙氧基甲
硅烷基烷基)-N,N'-草酰
脲(烷基=甲基或正丙基),在桥中带有高度刚性和极性的草酰
脲单元,被用作桥联氧化
硅膜的前体。研究了使用溶胶-凝胶工艺从前体制备的膜的气
水分离性能。有趣的是,膜的性能取决于烷基链的长度。含有亚甲基单元(烷基=甲基)的膜是多孔的,而是亲
水性的,而另一个具有较长
丙烯单元(烷基=正丙基)的膜是无孔的,并且疏
水性更高。高H 2 / SF 6使用含有甲基和正丙基的膜分别获得了3100和1700的气体渗透率,以及2000 ppm的NaCl
水溶液的NaCl截留率89和85%。烷基=甲基的膜在50℃下也显示出20.6的高CO 2 / N 2渗透率。这些结果表明该膜作为气体和
水分离材料的潜在应用。版权所有©2015 John Wiley&Sons,Ltd.