烷基取代咪唑类聚离子液体的吸附行为研究  

Adsorption Behavior of Alkyl Substituted Imadazolium-Based Poly(Ionic Liquid)

作　　者：潘传永 方王凯 徐雲霞 张伟[1] 

机构地区：[1]浙江理工大学理学院化学系,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2017年第1期140-145,共6页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省自然科学基金项目(LY13B040004)

摘　　要：以1-甲基咪唑(1-乙基咪唑、1-丁基咪唑)和4-乙烯基苄氯为原料合成氯盐离子液体,分别与NaBF4和KPF6阴离子交换反应后,通过自由基聚合制备咪唑类聚离子液体,将其用于对溶剂吸附行为的研究。利用ATRFTIR、1 HNMR和静态水接触角表征聚离子液体膜结构与性质。通过动态接触角法(DCA)表征聚离子液体膜分别在水、甲醇、乙醇、甲基叔丁基醚中的吸附行为。结果表明:聚离子液体膜对溶剂的吸附行为符合Bangham孔道扩散模型。吸附性能与聚离子液体结构密切相关。同种阴离子配对的聚离子液体,咪唑环上短烷基取代有利于增大溶剂的吸附量;当咪唑环上取代烷基相同时,亲水性强的阴离子有利于提高溶剂的吸附量。In this study, the chlorine salt ionic liquids were prepared by using 1-methyl imidazole（1- ethylimidazole or 1-butyl imidazole） and 4-vinylbenzylchloride. The corresponding imadazolium-based poly （ionic liquid）s （PILs） were synthesized through free radical polymerization after an anion exchange reaction with NaBF4 and KPF6 respectively and their adsorption behavior for different organic solvents were investigated. ATR-FTIR, 1H NMR and static water contact angle were used to characterize the structure and property of PIL membrane. The adsorption behavior of the as-prepared PIL membrane in water, methyl alcohol, ethyl alcohol and MTBE （methyl tert-butyl ether） were investigated by dynamic contact angle （DCA）. The results indicate that adsorption behaviors of PIL membrane for organic solvents can be well fitted with the Bangham pore diffusion model, and the adsorption property is closely related to the structure of PIL. For PIL paired by the same kind of anion, the shorter the alkyl chains substituted on the imidazole ring of PILs are, the more the adsorption amount of the solution is. With the identical alkyl substituted on the imidazole ring, the adsorption amount increases with enhancing the hydrophility of anion of PILs.

关 键 词：聚离子液体 吸附量 分离材料 孔道扩散 

分 类 号：O631.1[理学—高分子化学]