Modeling solvent evaporation during thin film formation in phase separating polymer mixtures
Preparation of thin films by dissolving polymers in a common solvent followed by evaporation of the solvent has become a routine processing procedure. However, modeling of thin film formation in an evaporating solvent has been challenging due to a need to simulate processes at multiple length and ti...
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| Veröffentlicht in: | Soft matter 2018, Vol.14 (10), p.1833-1846 |
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| container_title | Soft matter |
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| creator | Cummings, John Lowengrub, John S Sumpter, Bobby G Wise, Steven M Kumar, Rajeev |
| description | Preparation of thin films by dissolving polymers in a common solvent followed by evaporation of the solvent has become a routine processing procedure. However, modeling of thin film formation in an evaporating solvent has been challenging due to a need to simulate processes at multiple length and time scales. In this work, we present a methodology based on the principles of linear non-equilibrium thermodynamics, which allows systematic study of various effects such as the changes in the solvent properties due to phase transformation from liquid to vapor and polymer thermodynamics resulting from such solvent transformations. The methodology allows for the derivation of evaporative flux and boundary conditions near each surface for simulations of systems close to the equilibrium. We apply it to study thin film microstructural evolution in phase segregating polymer blends dissolved in a common volatile solvent and deposited on a planar substrate. Effects of the evaporation rates, interactions of the polymers with the underlying substrate and concentration dependent mobilities on the kinetics of thin film formation are studied. |
| doi_str_mv | 10.1039/c7sm02560b |
| format | Article |
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| fulltext | fulltext |
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| ispartof | Soft matter, 2018, Vol.14 (10), p.1833-1846 |
| issn | 1744-683X 1744-6848 |
| language | eng |
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Boundary conditions Computer simulation Evaporation Evaporation rate Kinetics Modelling Phase transitions Polymer blends Polymers Solvents Substrates Thermodynamics Thin films |
| title | Modeling solvent evaporation during thin film formation in phase separating polymer mixtures |
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