不同侧链BPPO阴离子交换膜的制备及其抗污染性能

采用含有不同碳链长度的4-乙基吡啶、3-丁基吡啶与3-己基吡啶，通过亲核取代反应分别对溴化聚苯醚（BPPO）进行季铵化，制得三种阴离子交换膜（QBPPO-1、QBPPO-2、QBPPO-3）并对其电化学性能、脱盐性能以及抗污染性能进行了研究。实验结果表明随着吡啶环上烷基碳链的增长，制得的离子交换膜的离子交换容量呈现下降趋势，由1.92 mmol/g降至1.34 mmol/g，而膜面电阻逐渐增加，由2.99 Ω·cm²增加到10.59 Ω·cm²；在电渗析实验中，与商业日本Fuji阴离子交换膜相比，本实验制备的三种离子交换膜均呈现出较高的脱盐率；在污染实验中，随着高分子骨架侧链碳链的增长，离子交换膜在污染实验中的的转折时间逐渐变短，抗污染能力下降；计算模拟结果表明疏水作用在有机污染物（十二烷基苯磺酸钠）与离子交换膜内高分子骨架侧链的亲和相互作用中占有重要地位。

Anti-fouling properties and preparation of anion-exchange membranes based on BPPO modified by different side chain lengths

Three kinds of anion-exchange membranes were prepared based on polyphenyl bromide (BPPO) modified by pyridine derivatives with different side chain lengths (4-ethylpyridine, 3-butyl pyridine and 3-hexylpyridine). With the increasing of the alkyl carbon chain length on the pyridine ring, the ion exchange capacity decreased from 1.92 mmol/g to 1.34 mmol/g and the membrane resistance was increased from 2.99 Ω·cm² to 10.59 Ω·cm². Compared with the desalination rate of commercial Fuji AEM, the three kinds of prepared AEMs all showed much higher desalination rate during electrodialysis experiment. The result of fouling experiment showed the transition-time of the membrane was more shortened with longer side-chains on the polymer backbone. The calculation and simulation results showed that the hydrophobic interaction played an important role in the affinity interaction between organic pollutants (sodium dodecylbenzene sulfonate) and the side chains of the polymer backbone of the ion exchange membrane.