Abstract Novel phosphorylated polyvinyl alcohol (PVA) and modified kaolinite (MK) composite membranes (P-PMK) were prepared using a solution casting method. Kaolinite was modified with a silane coupling agent, aminopropyl triethaoxy silane (APTES), in order to improve the organic/inorganic interfacial morphology. First, PVA/MK composite membranes were fabricated using various wt% of MK (0–20 wt%). The prepared composite membranes were then treated with phosphoric acid (H3PO4). The properties of P-PMK composite membranes were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), and AC impedance. It was found that proton conductivity was increased by increasing temperature as well as filler content yielding a maximum value of 0.0611 S cm−1 at 10 wt% filler content and 70 °C. The methanol permeability and water uptake were also changed by increasing filler percentage. The lowest methanol permeability, 2.87 × 10−6 cm−2 s−1, was obtained at 20 wt% filler content, which is lower than that of recast Nafion® 117. The results indicate that the PEM comprised of the phosphorylated PVA/MK composite has a good performance and can be a potential candidate for future PEMFC applications.

中文翻译：

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用于燃料电池应用的具有不同官能化粘土含量的聚合物电解质膜的质子电导率和甲醇渗透率研究

摘要 采用溶液浇铸法制备了新型磷酸化聚乙烯醇（PVA）和改性高岭石（MK）复合膜（P-PMK）。高岭石用硅烷偶联剂氨基丙基三乙氧基硅烷 (APTES) 改性，以改善有机/无机界面形态。首先，使用不同重量百分比的 MK（0-20 重量％）制造 PVA/MK 复合膜。然后用磷酸(H3PO4)处理制备的复合膜。使用傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、热重分析 (TGA)、扫描电子显微镜 (SEM) 和交流阻抗研究了 P-PMK 复合膜的性能。发现质子电导率随着温度的升高以及填料含量的增加而增加，最大值为 0。0611 S cm-1 在 10 wt% 填料含量和 70 °C 下。甲醇渗透率和吸水率也随着填料百分比的增加而改变。最低的甲醇渗透率为 2.87 × 10−6 cm−2 s−1，填料含量为 20 wt%，低于重铸 Nafion® 117。 结果表明 PEM 由磷酸化 PVA/MK 组成复合材料具有良好的性能，可以成为未来 PEMFC 应用的潜在候选者。