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首页> 美国卫生研究院文献>Polymers >Anion Exchange Membranes Obtained from Poly(arylene ether sulfone) Block Copolymers Comprising Hydrophilic and Hydrophobic Segments
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Anion Exchange Membranes Obtained from Poly(arylene ether sulfone) Block Copolymers Comprising Hydrophilic and Hydrophobic Segments

机译：从包含亲水和疏水链段的聚（亚芳基醚砜）嵌段共聚物中获得阴离子交换膜

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摘要

The anion exchange membrane may have different physical and chemical properties, electrochemical performance and mechanical stability depending upon the monomer structure, hydrophilicity and hydrophobic repeating unit, surface form and degree of substitution of functional groups. In current work, poly(arylene ether sulfone) (PAES) block copolymer was created and used as the main chain. After controlling the amount of NBS, the degree of bromination (DB) was changed in Br-PAES. Following that, quaternized PAES (Q-PAES) was synthesized through quaternization. Q-PAES showed a tendency of enhancing water content, expansion rate, ion exchange capacity (IEC) as the degree of substitution of functional groups increased. However, it was confirmed that tensile strength and dimensional properties of membrane reduced while swelling degree was increased. In addition, phase separation of membrane was identified by atomic force microscope (AFM) image, while ionic conductivity is greatly affected by phase separation. The Q-PAES membrane demonstrated a reasonable power output of around 64 mW/cm while employed as electrolyte in fuel cell operation.
机译：取决于单体结构，亲水性和疏水性重复单元，表面形式和官能团的取代度，阴离子交换膜可以具有不同的物理和化学性质，电化学性能和机械稳定性。在当前的工作中，聚（亚芳基醚砜）（PAES）嵌段共聚物被创建并用作主链。控制NBS的量后，在Br-PAES中改变溴化度（DB）。随后，通过季铵化合成了季铵化PAES（Q-PAES）。随着官能团取代度的增加，Q-PAES表现出增加水含量，膨胀率，离子交换容量（IEC）的趋势。但是，可以确认膜的拉伸强度和尺寸特性降低，而溶胀度提高。此外，膜的相分离是通过原子力显微镜（AFM）图像识别的，而离子电导率受相分离的影响很大。 Q-PAES膜在燃料电池运行中用作电解质时，显示出约64 mW / cm的合理功率输出。

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