Formation of ordered macroporous films from fluorinated polyimide by water droplets templating |
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Authors: | Lihua Wang Ye Tian Huaiyu Ding Biqian Liu |
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Affiliation: | Laboratory of New Materials, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, PR China |
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Abstract: | Preparation of honeycomb-patterned films from one of soluble fluorinated polyimides in a humid atmosphere was reported in this paper. This polyimide was synthesized from 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane (BDAF) by two-steps method, which has excellent solubility both in strong bipolar solvents or in common low boiling-point solvents. The glass transition temperature of 6FDA-BDAF polyimide was determined by DSC and as 238 °C. Thermogravimetric analysis indicated that soluble fluoro-polyimide has good thermal stability with maximum thermal decomposition temperature of 545 °C in nitrogen atmosphere. The honeycomb-patterned films were obtained by casting a drop of polymer solution on a solid substrate in a humid atmosphere. Some influence factors, such as the solution concentration, the type of the solvent and the humidity, were also tested. |
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Keywords: | Honeycomb pattern Fluorinated polyimide Highly humid atmosphere |
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