Mechanically and Thermally Enhanced Intrinsically Dopable Polyimide Membrane with Advanced Gas Separation Capabilities

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• 作者：Chang-Jian Weng ; Yu-Sian Jhuo ; Kuan-Yeh Huang ; Chun-Fang Feng ; Jui-Ming Yeh ; Yen Wei ; Mei-Hui Tsai
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：August 9, 2011
• 年：2011
• 卷：44
• 期：15
• 页码：6067-6076
• 全文大小：1191K
• 年卷期：v.44,no.15(August 9, 2011)
• ISSN：1520-5835

文摘

In this paper, we present the first preparation of an intrinsically dopable polyimide (DPI) membrane containing an amine-capped aniline trimer (ACAT) that reveals advanced gas separation capabilities as well as mechanically and thermally enhanced properties. The as-prepared DPI membrane was synthesized by reacting ACAT and 4,4鈥?(4,4鈥?isopropylidenediphenoxy)bis(phthalic anhydride) (BSAA) through a conventional thermal imidization reaction. Polyaniline (PANI) and conventional nondopable polyimide (NDPI) membranes were also prepared as controls. The DPI membranes were found to reveal permselectivities (伪) of O₂/N₂ of about 13.54, which is about 1.96- and 1.54-fold higher than that of NDPI and PANI, respectively, based on the investigation of gas permeability analysis (GPA). Upon doping with 1.0 M HCl (aq), the pemselectivities of DPI for O₂/N₂ were found to be further increased to about 16.63. Moreover, significantly enhanced mechanical and thermal properties of the as-prepared DPI membrane were also found as compared to those of NDPI and PANI membranes, based on the studies of dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA), respectively.