Polymer films must be thermally stable and mechanically strong to operate durably under extreme conditions (e.g., high temperature and tension). Herein we report the preparation of mesoporous films from poly(4-vinylpyridine)-block-poly(ether imide)-block-poly(4-vinylpyridine) (P4VP-b-PEI-b-P4VP) triblock copolymers. Owing to the high-performance engineering plastic PEI block, the mesoporous films are thermally stable up to 150 °C and show much higher mechanical strength than existing polystyrene-based films. Importantly, with a molecular weight of 27.7 kDa, the porous block copolymer films showed a tensile strength at break of 10.5 MPa and toughness of 0.68 MPa. The P4VP-b-PEI-b-P4VP films had predominant mesopores of tunable sizes and high specific surface areas, better than the commercial poly(ether sulfone) and polyamide films. The development of poly(ether imide)-based porous films provides an effective method for preparing thermally stable and mechanically strong membranes for extreme-condition operations.

中文翻译：

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聚醚酰亚胺基三嵌段共聚物的热稳定和机械强度高的介孔膜

聚合物薄膜必须具有热稳定性和机械强度，才能在极端条件（例如高温和高张力）下持久运行。本文我们报告介孔膜的由聚（4-乙烯基吡啶）的制备-嵌段-聚（醚酰亚胺） -嵌段-聚（4-乙烯基吡啶）（P4VP- b -PEI- b -P4VP）三嵌段共聚物。由于采用了高性能的工程塑料PEI嵌段，中孔薄膜在高达150°C的温度下具有热稳定性，并且比现有的聚苯乙烯基薄膜具有更高的机械强度。重要的是，多孔嵌段共聚物膜的分子量为27.7kDa，其断裂拉伸强度为10.5MPa，韧性为0.68MPa。P4VP- b -PEI- b-P4VP薄膜的主要介孔具有可调节的尺寸和高的比表面积，优于商业化的聚醚砜和聚酰胺薄膜。聚（醚酰亚胺）基多孔膜的开发为制备用于极端条件操作的热稳定且机械强度高的膜提供了有效的方法。