Synthesis of Polyimides Bearing Quaternary Ammonium Salt Groups and Their Application for Humidity Sensor

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Polyimides were prepared from 4,4'-(hexafluoropropylidene)-diphthalic anhydride (6FDA), N,N-bis(3-aminopropyl)-methylamine (BAPMA) and 4,4'-dimamino-diphenyl ether (ODA) by one-pot method. The tertiary amine of BAPMA moiety was reacted with large excess of ethyl bromide at 70 °C for 10 h completely to convert to the quaternary ammonium salt. Surface-resistance-type humidity sensors were prepared by dip-coating solutions of polyimides bearing quaternary ammonium salt groups onto comb-shaped gold electrodes on ceramic substrates. The humidity sensor based on NTDA-BAPMA/ODA(2/1) in quaternary ammonium salt form displayed reasonably high sensitivity to relative humidity and a small hysterisis between humidification and dehumidification runs.

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