Novel alkaline stable anion exchange membranes are prepared from various amounts of N-methyl dipicolylamine (MDPA) and brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO). The dipicolylamine and MDPA are synthesized through condensation reaction and confirmed by ¹H NMR spectroscopy. The morphologies of prepared membranes are investigated by atomic force microscopy (AFM), fourier transform infrared spectroscopy (FTIR), ¹H NMR spectroscopy and scanning electron microscopy (SEM). The electrochemical and physical properties of AEMs are tested comprising water uptake (WU), ion exchange capacity (IEC), alkaline stability, linear expansion ratio (LER), thermal stability and mechanical stability. The obtained hydroxide conductivity of MDPA-4 is 66.5 mS/cm at 80 °C. The MDPA-4 membrane shows good alkaline stability, high hydroxide conductivity, low methanol permeability (3.43 × 10⁻⁷ cm²/s), higher selectivity (8.26 × 10⁷ mS s/cm³), less water uptake (41.1%) and lower linear expansion (11.1%) despite of high IEC value (1.62 mmol/g). The results prove that MDPA membranes have great potential application in anion exchange membrane fuel cell.

中文翻译：

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新型碱性稳定阴离子交换膜的制备及性能评价

新型的碱稳定阴离子交换膜是由各种量的N-甲基二聚烯丙基胺（MDPA）和溴化的聚（2,6-二甲基-1,4-苯撑氧）（BPPO）制备的。通过缩合反应合成二聚烯丙胺和MDPA，并通过¹ H NMR光谱确认。通过原子力显微镜（AFM），傅立叶变换红外光谱（FTIR），¹对制备的膜的形态进行了研究1 H NMR光谱和扫描电子显微镜（SEM）。测试了AEM的电化学和物理特性，包括吸水率（WU），离子交换容量（IEC），碱性稳定性，线性膨胀率（LER），热稳定性和机械稳定性。在80°C下获得的MDPA-4的氢氧化物电导率为66.5 mS / cm。MDPA-4膜具有良好的碱性稳定性，高的氢氧化物传导性，低的甲醇渗透性（3.43×10 ^-7 cm ² / s），较高的选择性（8.26×10 ⁷ mS s / cm ³），吸水率较低（41.1％）尽管IEC值较高（1.62 mmol / g），线性膨胀率也较低（11.1％）。结果证明，MDPA膜在阴离子交换膜燃料电池中具有广阔的应用前景。