Anion Exchange Membranes by Bromination of Benzylmethyl-Containing Poly(sulfone)s
Anion Exchange Membranes by Bromination of Benzylmethyl-Containing Poly(sulfone)s
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DOI：
10.1021/ma902430y
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发表时间：
2010-02
期刊：
影响因子：
5.5
通讯作者：
Jingling Yan;M. Hickner
中科院分区：
文献类型：
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作者：
Jingling Yan;M. Hickner
本文详细研究了含苄基甲基的聚砜经卤甲基化和季铵化反应合成的阴离子导电膜的性能。在聚合物合成过程中引入了作为阳离子位点前体的苄基甲基部分，从而避免了通过氯甲基化对聚合物进行后改性。通过控制离子基团的分布，可以在很宽的范围内调节膜的阴离子电导率和吸水率。对于均匀分布的阳离子基团，吸水率和阴离子电导率相对于材料的离子交换容量是高的。当加入不可官能化的共聚单体时，对于给定的离子含量，吸水率降低。所有材料的吸水率和阴离子电导率之间存在很强的相关性。有趣的是，随着膜中的阳离子浓度由于水吸收的增加而降低，阴离子电导率增加。这种意想不到的关系之间的音量.
This report details the properties of anion-conducting membranes synthesized by halomethylation and quaternization of benzylmethyl-containing poly(sulfone)s. The benzylmethyl moieties, which serve as precursors to cationic sites, are introduced during polymer synthesis, thereby circumventing postmodification of the polymer by chloromethylation. By directing the distribution of ionic groups, the anion conductivity and water uptake of the membranes could be tuned over a wide range. For homogeneously distributed cationic groups, the water uptake and anionic conductivity were high relative to the material’s ion exchange capacity. When an unfunctionalizable comonomer was added, the water uptake decreased for a given ion content. A strong correlation between the water uptake and anion conductivity was observed for all materials. Interestingly, as the cation concentration in the membrane decreased due to an increase in water uptake, the anion conductivity increased. This unexpected relationship between the volum...