ABSTRACT Blends of PVA and 2-nitroso-1-naphtol-4-sulfonic acid (NNSA) ranging from 10 to 40 wt% were crosslinked in the presence of glutaraldehyde (GLA) to produce hybrid membranes. The structure and morphology of the hybrid membranes were studied by XRD, FE-SEM, EDX, and elemental mapping experiments. The mechanical performance and thermal stability of the membranes were also examined by dynamic mechanical analysis (DMA) and thermogravimetry analysis (TGA), respectively. Increasing the concentration of NNSA resulted in the improvement of mechanical and thermal performances of the membrane. The addition of NNSA and SiO2 to the solution of PVA makes the resultant hybrid membrane more hydrophilic, and therefore, the proton conductivity, water uptake and ion exchange capacity (IEC) improved. The highest proton conductivity value (0.18 S cm−1 at 30 °C) was found for the PVA/GLA/NNSA (40 wt%)/SiO2 (5 wt%) composite membrane. It was also demonstrated that the methanol permeability values decreased with increasing NNSA content.

中文翻译：

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用于 DMFC 应用的 PVA/NNSA/GLA/纳米二氧化硅质子传导复合膜的制备和表征

摘要 PVA 和 2-nitroso-1-naphtol-4-sulfonic acid (NNSA) 的 10 至 40 wt% 的混合物在戊二醛 (GLA) 存在下交联，以产生混合膜。通过XRD、FE-SEM、EDX和元素映射实验研究了混合膜的结构和形貌。还分别通过动态力学分析 (DMA) 和热重分析 (TGA) 检测了膜的机械性能和热稳定性。增加NNSA的浓度导致膜的机械和热性能的改善。在 PVA 溶液中加入 NNSA 和 SiO2 使所得杂化膜更具亲水性，因此质子电导率、吸水率和离子交换容量 (IEC) 得到改善。最高质子电导率值（0. PVA/GLA/NNSA (40 wt%)/SiO2 (5 wt%) 复合膜在 30 °C 下为 18 S cm-1)。还表明甲醇渗透率值随着 NNSA 含量的增加而降低。