Structuring of polymer solutions upon solvent evaporation

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
C SchaeferJ J Michels

Abstract

The morphology of solution-cast, phase-separated polymers becomes finer with increasing solvent evaporation rate. We address this observation theoretically for a model polymer where demixing is induced by steady solvent evaporation. In contrast to what is the case for a classical, thermal quench involving immiscible blends, the spinodal instability initially develops slowly and the associated length scale is not time invariant but decreases with time as t(-1/2). After a time lag, phase separation accelerates. Time lag and characteristic length exhibit power-law behavior as a function of the evaporation rate with exponents of -2/3 and -1/6. Interestingly, at later stages the spinodal structure disappears completely while a second length scale develops. The associated structure coarsens but does not follow the usual Lifshitz-Slyozov-Wagner kinetics.

References

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Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A J ArcherU Thiele
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Citations

Aug 27, 2015·Journal of the American Chemical Society·Jacobus J van FranekerRené A J Janssen
Mar 12, 2020·Physical Chemistry Chemical Physics : PCCP·Olivier J J RonsinJens Harting
Sep 7, 2019·Soft Matter·Charley SchaeferTom C B McLeish
Feb 6, 2018·Physical Review Letters·C Schaefer
May 26, 2021·Chemical Reviews·Marcus Müller, Volker Abetz
Oct 10, 2021·Communications Biology·Sreeparna MajeeSaptarshi Basu

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