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Using in situ optical microscope observations of the surface of polyphenylene oxide (PPO)/chloroform solution in the breath figure (BF) process, the detailed formation phenomenon of surface of the BF pattern was obtained. This phenomenon directly supports the “bursting hypothesis”. Based on the “bursting hypothesis” and additional experimental data, the mechanism for the late BF process of the PPO/chloroform...
Fabrication of honeycomb-patterned films from one of the soluble fluoro-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 4,4′-methylene dianiline (MDA) by two-step method. The obtained polyimide kept excellent rigidity and thermal stability, and especially, exhibited good solubility...
The ordered honeycomb polyphenylene oxide (PPO) film was prepared by casting the solution on a solid substrate in a high humid environment in this paper. It was found that PPO/CHCl 3 solution could form regular microporous film in a large range of solution concentration (2–70g/L) and their pore size was almost equal when the concentration varied from 5 to 30g/L. Based on these phenomena, the...
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