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首页> 外文期刊>RSC Advances >Phosphoric acid doped imidazolium silane crosslinked poly(epichlorihydrin)/PTFE as high temperature proton exchange membranes
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Phosphoric acid doped imidazolium silane crosslinked poly(epichlorihydrin)/PTFE as high temperature proton exchange membranes

机译：磷酸掺杂咪唑鎓硅烷交联聚（Epichlorihydrin）/ PTFE作为高温质子交换膜

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摘要

Low cost poly(epichlorohydrin) (PECH) was modified with imidazolium groups to prepare high temperature proton exchange membranes. Chloromethyl groups in the structure of the PECH benefit its modification with no need for highly toxic and carcinogenic chloromethylation reagents. Both methylimidazole (MeIm) and triethoxysilylpropyldihydroimidazole (SiIm) were used to carry out the S _(N) 2 nucleophilic substitution for grafting the imidazolium groups onto the PECH. Meanwhile crosslinking of the modified PECH was achieved by forming a crosslinked silane network via the hydrolysis reaction of SiIm in an acid medium. Moreover, porous poly(tetrafluoroethylene) (PTFE) was used as the membrane matrix to enhance the mechanical strength of the fabricated membranes. The obtained PECH–SiIm–MeIm/PTFE membranes displayed phosphoric acid doping capacities of 110–170 wt% with low volume swelling ratios of less than 120%. Anhydrous proton conductivities of 0.010–0.063 S cm ~(?1) were reached at elevated temperatures of 100–180 °C by the membranes with adequate mechanical strength. Fuel cell tests demonstrated the technical feasibility of acid doped PECH–SiIm–MeIm/PTFE membranes for high temperature proton exchange membrane fuel cells.
机译：用咪唑鎓基团改性低成本聚（对氯醇）（PECH）以制备高温质子交换膜。 PECH的结构中的氯甲基有益于其改性，无需高毒性和致癌氯甲基化试剂。甲基咪唑（MEIM）和三乙氧基酰甲甲吡喃吡唑（SIIM）用于进行S _（n）2亲核代替，用于将咪唑鎓基团移植到PECH上。同时通过在酸介质中的SiIM的水解反应形成交联的硅烷网络来实现改性PECH的交联。此外，多孔聚（四氟乙烯）（PTFE）用作膜基质，以增强制造膜的机械强度。所获得的PECH-SIIM-MEIM / PTFE膜显示出110-170重量％的磷酸掺杂能力，低体积溶胀比小于120％。在100-180℃的高温下通过具有足够的机械强度的膜达到0.010-0.063scm〜（α1）的无水质子电导率。燃料电池试验证明了高温质子交换膜燃料电池的酸掺杂Pech-Siim-Meim / PTFE膜的技术可行性。

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