An Efficient Polymer Molecular Sieve for Membrane Gas Separations
An Efficient Polymer Molecular Sieve for Membrane Gas Separations
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DOI：
10.1126/science.1228032
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发表时间：
2013-01-18
期刊：
影响因子：
56.9
通讯作者：
McKeown, Neil B.
中科院分区：
文献类型：
--
作者：
Carta, Mariolino;Malpass-Evans, Richard;McKeown, Neil B.
将高渗透性和选择性结合在一起的气体分离膜需要具有极高刚性的微孔聚合物。我们报道了一种由苯环组成的形状恒定的梯形聚合物，这些苯环通过刚性的桥联双环单元融合在一起。这种聚合物扭曲的形状确保了微孔(内表面积大于每克1000平方米)和溶解性，因此它很容易从溶液中浇铸成坚固的薄膜。这些薄膜表现出作为分子筛的卓越性能，具有高气体渗透率和对氢和氧等较小气体分子的良好选择性，而对较大分子(如氮气和甲烷)具有良好的选择性。因此，这种聚合物具有很好的潜力来制作适合于商业和环境相关的大规模气体分离的膜。
Microporous polymers of extreme rigidity are required for gas-separation membranes that combine high permeability with selectivity. We report a shape-persistent ladder polymer consisting of benzene rings fused together by inflexible bridged bicyclic units. The polymer's contorted shape ensures both microporosity-with an internal surface area greater than 1000 square meters per gram-and solubility so that it is readily cast from solution into robust films. These films demonstrate exceptional performance as molecular sieves with high gas permeabilities and good selectivities for smaller gas molecules, such as hydrogen and oxygen, over larger molecules, such as nitrogen and methane. Hence, this polymer has excellent potential for making membranes suitable for large-scale gas separations of commercial and environmental relevance.