膜科学与技术

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Preparation and salt / water permeation behavior of positively charged films based on ionic liquid block copolymer*

Authors： LI Jing，DU Chunhui*，WU Chunjin，SUN Kaixiang，WU Liguang

Units： School of Environmental Science and Engineering，Zhejiang Gongshang University，Hangzhou，310018，China)

KeyWords： ionic liquid; block copolymer; charged property; permeation property

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(5):1-8

Abstract：

Ionic liquid block copolymers poly (methyl methacrylate) (PMMA)-b-poly (1-[(2-methacryloyloxy)ethyl]-3-butylimidazolium bromide) (PMEBIm-Br) with three different PMEBIm-Br block ratios were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization method, and then used to prepare the dense films by solvent evaporation method. The effects of chemical structure, surface morphology and charge properties of PMMA-b-PMEBIm-Br on the film properties were studied. The pure water flux, salt permeability, salt flux and rejection of the films were tested and the results showed that PMMA-b-PMEBIm-Br films had good salt permeation behavior to NaCl, MgCl2, CaCl2, Na2SO4 and MgSO4 aqueous solutions. The films also exhibited higher rejection to MgCl2 aqueous solution than NaCl and MgSO4 and its value reached 97%. The length of PMEBIm-Br segments in the block copolymers also have great effects on the film performance, such as water swelling ratio, hydrophilicity, charged property and salt/water permeability.

Funds：

国家自然科学基金青年科学基金资助项目（51103130）；浙江省自然科学基金资助项目（LY15B040001）

AuthorIntro：

作者简介：李静（1990-），女，山东滕州人，在读硕士，师承杜春慧副教授，从事功能膜材料及膜分离技术研究。

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