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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of poly(vinyl alcoho)-based membranes for direct methanol fuel cell
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Synthesis and characterization of poly(vinyl alcoho)-based membranes for direct methanol fuel cell

机译：直接甲醇燃料电池用聚乙烯醇基膜的合成与表征

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摘要

Membranes made of poly(vinyl alcohol) (PVA) and its ionic blends with sodium alginate (SA) and chitosan were synthesized and characterized for their ion-exchange capacity (IEC) and swelling index values to investigate their applicability in direct methanol fuel cells (DMFCs). These membranes were assessed for their intermolecular interactions, thermal stabilities, and mechanical strengths with Fourier transform infrared spectroscopy, Xray diffraction methods, differential scanning calorimetry, thermogravimetric analysis, and tensile testing, respectively. Methanol permeability and proton conductivity were also estimated and compared to that of Nation 117. In addition to being effective methanol barriers, the membranes had a considerably high IEC and thermal and mechanical stabilities. The addition of small amounts of anionic polymer was particularly instrumental in the significant reduction of methanol permeability from 8.1 x 10(-8) cm(2)/s for PVA to 6.9 X 10(-8) cm(2)/s for the PVA-SA blend, which rendered the blend more suitable for a DMFC. Low methanol permeability, excellent physicomechanical properties, and above all, cost effectiveness could make the use of these blends in DMFCs quite attractive. (C) 2005 Wiley Periodicals, Inc.
机译：合成了由聚乙烯醇（PVA）制成的膜及其与藻酸钠（SA）和壳聚糖的离子共混物，并对其离子交换能力（IEC）和溶胀指数值进行了表征，以研究其在直接甲醇燃料电池中的适用性（ DMFC）。分别通过傅立叶变换红外光谱，X射线衍射法，差示扫描量热法，热重分析和拉伸试验评估了这些膜的分子间相互作用，热稳定性和机械强度。还估算了甲醇的渗透性和质子传导性，并与Nation 117进行了比较。该膜除了是有效的甲醇屏障外，还具有相当高的IEC以及热和机械稳定性。少量阴离子聚合物的添加特别有助于将甲醇渗透性从PVA的8.1 ​​x 10（-8）cm（2）/ s显着降低到6.9 X 10（-8）cm（2）/ s。 PVA-SA共混物，使该共混物更适合DMFC。低的甲醇渗透性，出色的物理机械性能以及最重要的是，成本效益使这些混合物在DMFC中的使用非常有吸引力。 （C）2005 Wiley期刊公司

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