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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。
Chloride ionic liquids were synthesized from 1-methylimidazole (1-ethylimidazole, 1-butylimidazole) and 4-vinylbenzyl chloride. After anion exchange reaction with NaBF4 and KPF6 respectively, imidazole Polycation-like liquid, which is used for the study of solvent adsorption behavior. The structure and properties of polyionic liquid membranes were characterized by ATRFTIR, 1 HNMR and static water contact angles. The adsorption behavior of polyionic liquid membranes in water, methanol, ethanol and methyl tert-butyl ether was characterized by dynamic contact angle method (DCA). The results show that the adsorption behavior of the ionic liquid membrane to the solvent conforms to the Bangham pore diffusion model. Adsorption properties and polyionic liquid structure is closely related. The same anionic pairing polyionic liquid, short alkyl substitution on the imidazole ring is conducive to increasing the adsorption capacity of the solvent; when the substituted alkyl on the imidazole ring is the same, the strong hydrophilic anion is beneficial to increase the adsorption capacity of the solvent.