State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.
Langmuir. 2010 Dec 7;26(23):18357-61. doi: 10.1021/la103473u. Epub 2010 Nov 10.
In this Article, we addressed a facile method for the fabrication of porous polyimide film with an ordered surface based on the solvent-evaporation-assisted in situ self-assembly of polyamic acid (PAA, precursor of polyimide) and silica microspheres during vacuum-drying of PAA/silica colloid solution. Hydroxyl groups on the surface of silica microspheres have strong hydrogen-bonding with PAA chains, which improve the dispersion of silica microspheres in PAA/DMF solution and further help the self-assembly of PAA/silica colloid solution via solvent evaporation. The approach is simple, neither the preparation of special template nor complex preparation process and precise control over condition is necessary. Furthermore, the method could be employed for mass production of ordered porous polyimide films, and by changing the content and size of silica microspheres, the pore size and porous structure of the porous polyimide films could be tunable. The wettability behavior of the as-prepared porous polyimide films is also studied; the ordered surface topography of the porous polyimide films could change the wettability from hydrophilicity to hydrophobicity.
在本文中，我们提出了一种简便的方法，通过聚酰胺酸（聚酰亚胺的前体）和二氧化硅微球在聚酰胺酸/二氧化硅胶体溶液真空干燥过程中溶剂蒸发辅助的原位自组装，制备具有有序表面的多孔聚酰亚胺膜。二氧化硅微球表面的羟基与聚酰胺酸链具有很强的氢键，这改善了二氧化硅微球在聚酰胺酸/DMF 溶液中的分散性，并进一步有助于通过溶剂蒸发进行聚酰胺酸/二氧化硅胶体溶液的自组装。该方法简单，既不需要制备特殊模板，也不需要复杂的制备工艺和对条件的精确控制。此外，该方法可用于大规模生产有序多孔聚酰亚胺薄膜，并且通过改变二氧化硅微球的含量和尺寸，可以调节多孔聚酰亚胺薄膜的孔径和多孔结构。我们还研究了所制备的多孔聚酰亚胺薄膜的润湿性行为；多孔聚酰亚胺薄膜的有序表面形貌可以使润湿性从亲水性变为疏水性。
