Triphenylamine‐based polyimides with trimethyl substituents for gas separation membrane and electrochromic applications |
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| Authors: | Hung‐ju Yen Shiue‐ming Guo Jui‐ming Yeh Guey‐Sheng Liou |
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| Institution: | 1. Functional Polymeric Materials Laboratory, Institute of Polymer Science and Engineering, National Taiwan University, No.1, Sec. 4, Roosevelt Rd. Taipei, 10617, Taiwan;2. Department of Chemistry and Center for Nanotechnology and R&D Center for Membrane Technology, Chung‐Yuan Christian University, Chung Li 32023, Taiwan |
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| Abstract: | Two series of polyimides I – II with methyl‐substituted triphenylamine units were prepared from the diamines, 4,4′‐diamino‐2″,4″,6″‐trimethyltriphenylamine (Me3TPA‐diamine; 1 ) and 4,4′‐diamino‐4″‐methyltriphenylamine (MeTPA‐diamine; 2 ), and two commercially available tetracarboxylic dianhydrides via a conventional two‐step chemical imidization. All the polymers were readily soluble in many polar solvents and showed useful levels of thermal stability associated with high glass transition temperatures (266–340 °C) and high char yields (higher than 49% at 800 °C in nitrogen). The polymer films showed reversible electrochemistry/electrochromism accompanied by a color change from neutral pale yellow to green oxidized form with good coloration efficiency, switching time, and stability. The CO2 permeability coefficients (PCO2) and permeability selectivity (PCO2/PCH4) for these polyimide membranes were in the range of 34.1–229.2 barrer and 21.3–28.9, respectively. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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| Keywords: | electrochromic polymers functionalization of polymers gas permeation high performance polymers polycondensation polyimides |
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