Keywords
Interfaces, Polymer films, Polymers, Precipitation, Viscosity
Abstract
Motivated by the much discussed, yet unexplained, presence of macrovoids in polymer membranes, we explore the impact of Marangoni flows in the process of nonsolvent induced phase separation. Such flows have been hypothesized to be important to the formation of macrovoids, but little quantitative evidence has been produced to date. Using a recently developed multifluid phase field model, we find that roll cells indicative of a solutal Marangoni instability are manifest during solvent/nonsolvent exchange across a stable interface. However, these flows are weak and subsequently do not produce morphological features that might lead to macrovoid formation. By contrast, initial conditions that lead to an immediate precipitation of the polymer film coincide with large Marangoni flows that disturb the interface. The presence of such flows suggests a new experimental and theoretical direction in the search for a macrovoid formation mechanism.
Original Publication Citation
https://doi.org/10.1021/acsmacrolett.8b00012
BYU ScholarsArchive Citation
Tree, Douglas R.; Iwama, Tatsuhiro; Delaney, Kris T.; Lee, Joshua; and Fredrickson, Glenn H., "Marangoni Flows during Nonsolvent Induced Phase Separation" (2018). Faculty Publications. 6200.
https://scholarsarchive.byu.edu/facpub/6200
Document Type
Peer-Reviewed Article
Publication Date
2018-04-27
Permanent URL
http://hdl.lib.byu.edu/1877/8929
Publisher
American Chemical Society
Language
English
College
Ira A. Fulton College of Engineering
Department
Chemical Engineering
Copyright Status
Copyright © 2018 American Chemical Society
Copyright Use Information
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