Journal
POLYMER
Volume 55, Issue 11, Pages 2688-2696Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.04.025
Keywords
Ionic liquids; Zwitterionic copolymer; PVDF membranes
Categories
Funding
- National Natural Science Foundation of China [51273176]
- National High Technology Research and Development Program of China (863 Program of China) [2012AA03A602]
- Zhejiang Provincial Sci AMP
- Tech Plan of China [2010C31028]
- Fundamental Research Funds for the Central Universities [2014QNA4038]
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A new series of green solvents that constituted with ionic liquids (ILs) and dimethyl acetamide (DMAc) were developed as good solvents for zwitterionic copolymers, and the dissolutions of amphiphilic copolymers carrying carboxylbetaine and sulfonatebetaine in these new solvents were studied. It was determined that the commonly found Its such as 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) and many others were all effective co-solvents for zwitterionic copolymer with carboxylbetaine groups. However, the 1-methylimidazolium trifluoromethanesulfonic ([MIM]CF3SO3) instead of the [BMIM]BF4 was proved as an effective co-solvent for the copolymer carrying sulfonatebetaine units. These newly designed mix-solvents were also good solvents for poly(vinylidene fluoride) (PVDF) and their influences on the crystallization as well as the formation of PVDF membranes were investigated. Our results had demonstrated that blend membranes with zwitterionic additives could be facilely prepared with many new solvent candidates. (C) 2014 Elsevier Ltd. All rights reserved.
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