|Title:||A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS)-Evidence and mechanism of formation||Authors:||Menut P.
|Keywords:||In situ analysis;Membrane morphology;Poly(ether-imide);Surface liquid layer;Vapor-induced phase separation||Issue Date:||2008||Journal Volume:||310||Journal Issue:||1-2||Start page/Pages:||278-288||Source:||Journal of Membrane Science||Abstract:||
The formation of a surface liquid layer on the top of membrane forming systems made of poly(ether-imide) (PEI) and N-methylpyrrolidone (NMP) was clearly demonstrated during water vapor-induced phase separation (VIPS) through several in situ investigation methods including optical microscopy and dynamic water contact angle measurements for a qualitative approach, and Raman confocal and FTIR microscopy for a quantitative one. A mechanism involving the shrinkage from the polymer-rich phase consecutively to the surface phase separation is proposed to account for the significantly high concentration of PEI in the surface liquid layer. The emergence of a surface liquid layer during the phase separation process is discussed in terms of implications on morphology of membrane fabricated using VIPS and how it contrasts with liquid-induced phase separation. ? 2007 Elsevier B.V. All rights reserved.
|Appears in Collections:||化學工程學系|
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