A rheometry method to assess the evaporation-induced mechanical strength development of polymer solutions used for membrane applications |
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| Authors: | Eduard Caicedo-Casso Jessica Sargent Rachel M Dorin Ulrich B Wiesner William A Phillip Bryan W Boudouris Kendra A Erk |
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| Affiliation: | 1. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907;2. Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907;3. Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853-1505;4. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556 |
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| Abstract: | Rotational and oscillatory shear rheometry were used to quantify the flow behavior under minimal and significant solvent evaporation conditions for polymer solutions used to fabricate isoporous asymmetric membranes by the self-assembly and non-solvent induced phase separation (SNIPS) method. Three different A-B-C triblock terpolymer chemistries of similar molar mass were evaluated: polyisoprene-b-polystyrene-b-poly(4-vinylpyridine) (ISV); polyisoprene-b-polystyrene-b-poly(N,N-dimethylacrylamide) (ISD); and polyisoprene-b-polystyrene-b-poly(tert-butyl methacrylate) (ISB). Solvent evaporation resulted in the formation of a viscoelastic film typical of asymmetric membranes. Solution viscosity and film viscoelasticity were strongly dependent on the chemical structure of the triblock terpolymer molecules. A hierarchical magnitude (ISV > ISB > ISD) was observed for both properties, with ISV solutions displaying the greatest solution viscosity, fastest film strength development, and greatest strength magnitude. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47038. |
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| Keywords: | block copolymer rheology filtration membranes shear rheometry SNIPS viscoelasticity of polymer solutions |
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