Preparation and characterization of high ionic conducting alkaline non-woven membranes by sulfonation
Preparation and characterization of high ionic conducting alkaline non-woven membranes by sulfonation
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DOI：
10.1016/j.memsci.2006.07.025
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发表时间：
2006-11
影响因子：
9.5
通讯作者：
Wu Gwo-Mei;S. Lin;Chun–Chen Yang
中科院分区：
文献类型：
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作者：
Wu Gwo-Mei;S. Lin;Chun–Chen Yang
提出了一种利用无纺布聚丙烯/聚乙烯（PP/PE）核壳片膜制备低成本碱性高离子导电膜分离器的新方法。磺化反应通过改善聚合物的亲水性和非晶态结构来提高膜的阴离子导电性。采用交流阻抗、接触角测量系统、差示扫描量热仪（DSC）、热重分析（TGA）、红外光谱（IR）、元素分析（EA）、应力应变测试、x射线衍射（XRD）和扫描电镜（SEM）对膜分离器的特性进行了研究。红外光谱证实了磺酸基团在聚合物膜中的掺入。结果表明，磺化处理反应对提高无纺布膜的表面亲水性非常有效。适当的磺化工艺可使膜的室温阴离子电导率从0.0088提高到0.0175Scm−1。磺化膜的耐热性（4%）和机械强度（21%）下降有限。此外，对由这些膜分离器组装的固态锌-空气电池的进一步研究也表明，电池功率密度从16兆瓦/平方厘米提高到27兆瓦/平方厘米，提高了69%。
A novel method has been proposed for the preparation of alkaline, high ionic conducting membrane separators with lower cost using non-woven polypropylene/polyethylene (PP/PE) core–shell sheet membranes. Sulfonation was employed to enhance the membrane anionic conductivity by improved hydrophilicity and more amorphous structure of the polymer. The characteristic properties of these membrane separators have been studied by ac impedance, contact angle measuring system, differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), infrared spectroscopy (IR), elemental analysis (EA), stress–strain test, X-ray diffraction (XRD) and scanning electron microscope (SEM). The incorporation of sulfonic acid groups in the polymer membranes was evidenced by the IR spectroscopy. The results showed that the sulfonation treatment reaction was very effective in increasing the surface hydrophilicity of the non-woven membranes. The suitable sulfonation process could increase the room temperature anionic conductivity of the membranes from 0.0088 to 0.0175Scm−1. The sulfonated membranes showed limited decline in thermal resistance (4%) and mechanical strength (21%). In addition, the further study on the solid-state zinc-air cells assembled from these membrane separators also exhibited an improved battery power density by 69%, from 16 to 27mW/cm2.