Facile and green fabrication of polybenzoxazine-based composite anion-exchange membranes with a self-cross-linked structure |
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Authors: | Naeem Akhtar Qaisrani Yanjiao Ma Lingling Ma Jiafei Liu Li Gao Lv Li Shoutao Gong Xiaoming Yan Fengxiang Zhang Gaohong He |
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Institution: | 1.State Key Laboratory of Fine Chemicals, School of Chemical and Petroleum Engineering,Dalian University of Technology,Panjin,China |
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Abstract: | A new type of composite anion-exchange membrane is fabricated using benzoxazine (Bz) monomer and polytetrafluoroethylene (PTFE) via a green and facile method. Membrane fabrication is achieved via in situ ring-opening polymerization of Bz within the PTFE matrix, followed by quaternization and ion-exchange reactions. The quaternized PBz works as a self-cross-linked and anion conductive polymer. The synthesized membranes show improved conductivity (26 to 70 mS/cm) at a reasonable water uptake and a low swelling ratio; they also show improved alkaline stability for 150 h at 60 °C in 1 M KOH solution, the decrease in conductivity being only ca. 10%. Our method of AEM fabrication is advantageous over conventional ones due to facile process and the avoidance of chloro- or bromomethylation as well as the self-cross-linked structure; the resulting membranes show relatively good performance as compared with some of those obtained from conventional techniques. |
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