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Marangoni Flows during Nonsolvent Induced Phase Separation.

Douglas R Tree1, Tatsuhiro Iwama2, Kris T Delaney

  • 1Chemical Engineering Department, Brigham Young University, Provo, Utah 84602, United States.

ACS Macro Letters
|May 28, 2022
PubMed
Summary
This summary is machine-generated.

Marangoni flows impact macrovoid formation in polymer membranes during nonsolvent induced phase separation. While weak flows don't cause macrovoids, immediate precipitation leads to significant flows, suggesting a new research direction.

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Area of Science:

  • Polymer science
  • Materials science
  • Chemical engineering

Background:

  • Macrovoids in polymer membranes are a persistent, unexplained phenomenon.
  • Marangoni flows are hypothesized to play a role in macrovoid formation during nonsolvent induced phase separation.
  • Quantitative evidence linking Marangoni flows to macrovoids is limited.

Purpose of the Study:

  • To investigate the impact of Marangoni flows on macrovoid formation in polymer membranes.
  • To explore the role of solutal Marangoni instability in nonsolvent induced phase separation.
  • To provide quantitative insights into the mechanisms of macrovoid development.

Main Methods:

  • Utilized a recently developed multifluid phase field model.
  • Simulated solvent/nonsolvent exchange across a polymer solution interface.
  • Analyzed the manifestation and strength of Marangoni flows under varying initial conditions.

Main Results:

  • Solutal Marangoni instability, indicated by roll cells, was observed during solvent/nonsolvent exchange with a stable interface.
  • These flows were found to be weak and did not induce morphological changes leading to macrovoids.
  • Immediate polymer film precipitation resulted in significant Marangoni flows that disturbed the interface.

Conclusions:

  • Weak Marangoni flows are insufficient to cause macrovoid formation.
  • Strong Marangoni flows, associated with rapid precipitation, are linked to interface disturbances.
  • The findings suggest a new avenue for experimental and theoretical research into macrovoid formation mechanisms.