Microporous polymer nanosheets with thicknesses in the range 3-5 nm and with high apparent surface area (Brunauer-Emmett-Teller surface area 940 m2 g-1 ) are formed when the effectively bifunctional (tetrafluoro) monomer used in the preparation of the prototypical polymer of intrinsic microporosity PIM-1 is replaced with an effectively tetrafunctional (octafluoro) monomer to give a tightly crosslinked network structure. When employed as a filler in mixed-matrix membranes based on PIM-1, a low loading of 0.5 wt% network-PIM-1 nanosheets gives rise to enhanced CO2 permeability and CO2 /CH4 selectivity, compared to pure PIM-1.

中文翻译：

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用于高性能气体分离膜的本征微孔聚合物纳米片。

当在原型聚合物的制备中使用有效的双官能（四氟）单体时，会形成厚度在3-5 nm范围内且具有高表观表面积（Brunauer-Emmett-Teller表面积940 m2 g-1）的微孔聚合物纳米片。内在的微孔性PIM-1被有效的四官能（八氟）单体取代，形成了紧密交联的网络结构。当用作基于PIM-1的混合基质膜的填料时，与纯PIM-1相比，低负载的0.5 wt％网络PIM-1纳米片会提高CO2的渗透性和CO2 / CH4的选择性。