Kinetic characterization of demixing processes occurring in casting solutions during manufacture of macroporous membranes (second milestone)
The creation of a macroporous structure results from the induced demixing of a casting solution whether by selectively removing the solvent or by adding nonsolvents. Even if these industrial processes are nowadays performed at large scale (millions of mē/year), the basic mechanisms, that lead to membranes with well-defined pore sizes (from 30 to 200 nm) are not yet known and, hence, the technical process is far from being optimized. During our SANS measurements at ILL last summer (DIR-109), we achieved our first objective by developing an experimental setup that enables us to investigate the demixing of usual casting solution with SANS. Our results revealed us that we are dealing with much more complex systems than what we assumed. This higher complexity is due to the overlapping of two miscibility gaps which lead to interesting and so far never observed demixing phenomena. We are therefore interested in achieving our second milestone the thermodynamic and kinetic characterization of the demixing of such systems.
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METZE Michael; BARBE Stephan; ECKOLD Goetz; MORITZ Paul; REICHE Annette and SCHWEINS Ralf. (2014). Kinetic characterization of demixing processes occurring in casting solutions during manufacture of macroporous membranes (second milestone). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1705
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