Polyethersulfone flat sheet and hollow fiber membranes from solutions in ionic liquids
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Type
ArticleKAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionComputational Physics and Materials Science (CPMS)
Environmental Science and Engineering Program
Material Science and Engineering Program
Nanostructured Polymeric Membrane Lab
Physical Science and Engineering (PSE) Division
Date
2017-06-10Online Publication Date
2017-06-10Print Publication Date
2017-10Permanent link to this record
http://hdl.handle.net/10754/625111
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We fabricated flat-sheet and hollow fiber membranes from polyethersulfone (PES) solutions in two ionic liquids: 1-ethyl-3-methylimidazolium diethyl phosphate ([EMIM]DEP) and 1,3-dimethylimidazolium dimethyl phosphate ([MMIM]DMP). The solvents are non-volatile and less toxic than organic solvents, such as dimethylformamide (DMF). The membranes morphologies were compared with those of membranes prepared from solutions in DMF, using electron microscopy. Water permeance, solute rejection and mechanical strengths were evaluated. Membranes were applied to DNA separation. While membranes based on PES were successfully prepared, polysulfone (PSf) does not dissolve in the same ionic liquids. The discrepancy between PES and PSf could not be explained using classical Flory-Huggins theory, which does not consider the coulombic contributions in ionic liquids. The differences in solubility could be understood, by applying density functional theory to estimate the interaction energy between the different polymers and solvents. The theoretical results were supported by experimental measurements of intrinsic viscosity and dynamic light scattering (DLS).Citation
Kim D, Vovusha H, Schwingenschlögl U, Nunes SP (2017) Polyethersulfone flat sheet and hollow fiber membranes from solutions in ionic liquids. Journal of Membrane Science 539: 161–171. Available: http://dx.doi.org/10.1016/j.memsci.2017.06.001.Sponsors
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).Publisher
Elsevier BVJournal
Journal of Membrane ScienceAdditional Links
http://www.sciencedirect.com/science/article/pii/S0376738817303496ae974a485f413a2113503eed53cd6c53
10.1016/j.memsci.2017.06.001