Dynamics of polymer film formation during spin coating

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Date
2014
Authors
Mouhamad, Y.
Mokarian-Tabari, Parvaneh
Clarke, Nigel
Jones, R. A. L.
Geoghegan, M.
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Volume Title
Publisher
AIP Publishing
Published Version
10.1063/1.4896674
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Abstract
Standard models explaining the spin coating of polymer solutions generally fail to describe the early stages of film formation, when hydrodynamic forces control the solution behavior. Using in situ light scattering alongside theoretical and semi-empirical models, it is shown that inertial forces (which initially cause a vertical gradient in the radial solvent velocity within the film) play a significant role in the rate of thinning of the solution. The development of thickness as a function of time of a solute-free liquid (toluene) and a blend of polystyrene and poly(methyl methacrylate) cast from toluene were fitted to different models as a function of toluene partial pressure. In the case of the formation of the polymer blend film, a concentration-dependent (Huggins) viscosity formula was used to account for changes in viscosity during spin coating. A semi-empirical model is introduced, which permits calculation of the solvent evaporation rate and the temporal evolution of the solute volume fraction and solution viscosity. (C) 2014 Author(s).
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Keywords
Non-Newtonian fluids , Rotating-disk , Phase separation , Flow , Evaporation , Rheology , Blends , Liquid , Solvents , Viscosity , Solution on polymerization , Spin coating , Evaporation
Citation
Mouhamad, Y., Mokarian-Tabari, P., Clarke, N., Jones, R. A. L. and Geoghegan, M. (2014) 'Dynamics of polymer film formation during spin coating', Journal of Applied Physics, 116(12), 123513 (8pp). doi: 10.1063/1.4896674
Link to publisher’s version
http://aip.scitation.org/doi/10.1063/1.4896674
URI
https://hdl.handle.net/10468/4716
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Tyndall National Institute - Journal Articles
Chemistry - Journal Articles
Copyright
© 2014 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Mouhamad, Y., Mokarian-Tabari, P., Clarke, N., Jones, R. A. L. and Geoghegan, M. (2014) 'Dynamics of polymer film formation during spin coating', Journal of Applied Physics, 116(12), 123513 (8pp). doi: 10.1063/1.4896674 and may be found at http://aip.scitation.org/doi/10.1063/1.4896674