College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering , Sichuan University , Chengdu 610065 , People's Republic of China.
ACS Appl Mater Interfaces. 2018 Oct 24;10(42):36443-36455. doi: 10.1021/acsami.8b12887. Epub 2018 Oct 10.
In this study, poly(ionic liquids/ N-isopropylacrylamide) (PIL/NIPAM) modified poly(ether sulfone) microporous membranes were prepared using a pore-filling method. Due to the anion-sensitive wettability of the PIL and the thermal-sensitive phase transformation of PNIPAM, the permeability of the modified membranes showed robust anion and thermal dual-responsive behaviors. In addition, the response temperature of the membranes could be adjusted precisely from 30 to 55 °C by anion exchange, which was attributed to the cooperative interaction of the PIL and PNIPAM. The switchable response temperature and the dual-responsive performances of the membranes were demonstrated by measuring the water fluxes under various conditions. The results indicated that the membrane permeabilities increased when exchanging the counteranions (CAs) from hydrophilic to hydrophobic ones; the thermal response behaviors were also obvious, and the sensitivity increased when increasing the hydrophobicity of the CA (the fluxes could be adjusted from 0 to 3800 mL/m mmHgh by controlling the temperature and CAs). At last, filtration tests were designed with the membranes, and the results indicated that by controlling the temperature and/or CA species, three different poly(ethylene glycol) molecules could be easily separated according to their molecule sizes in a single step.
在这项研究中，采用孔隙填充法制备了聚（离子液体/ N-异丙基丙烯酰胺）（PIL/NIPAM）修饰的聚醚砜微孔膜。由于 PIL 的阴离子敏感性润湿性和 PNIPAM 的热敏感相转变，改性膜的渗透性表现出强的阴离子和热双重响应行为。此外，通过阴离子交换可以将膜的响应温度精确调节至 30 至 55°C，这归因于 PIL 和 PNIPAM 的协同相互作用。通过在各种条件下测量水通量来证明了膜的可切换响应温度和双重响应性能。结果表明，当将抗衡阴离子（CAs）从亲水性交换为疏水性时，膜的渗透率增加；热响应行为也很明显，并且随着 CA 的疏水性增加（通过控制温度和 CA 可以将通量从 0 调节至 3800 mL/m mmHgh），敏感性增加。最后，设计了膜的过滤测试，结果表明，通过控制温度和/或 CA 种类，可以根据分子尺寸一步轻松分离三种不同的聚乙二醇分子。
