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Quantitative evaluation of evaporation rate during spin-coating of polymer blend films: Control of film structure through defined-atmosphere solvent-casting

The European Physical Journal E volume 33, pages 283–289 (2010)Cite this article

Abstract.

Thin films of polymer mixtures made by spin-coating can phase separate in two ways: by forming lateral domains, or by separating into distinct layers. The latter situation (self-stratification or vertical phase separation) could be advantageous in a number of practical applications, such as polymer optoelectronics. We demonstrate that, by controlling the evaporation rate during the spin-coating process, we can obtain either self-stratification or lateral phase separation in the same system, and we relate this to a previously hypothesised mechanism for phase separation during spin-coating in thin films, according to which a transient wetting layer breaks up due to a Marangoni-type instability driven by a concentration gradient of solvent within the drying film. Our results show that rapid evaporation leads to a laterally phase-separated structure, while reducing the evaporation rate suppresses the interfacial instability and leads to a self-stratified final film.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University of Sheffield, S3 7RH, Sheffield, UK

    P. Mokarian-Tabari, M. Geoghegan, J. R. Howse, S. Y. Heriot & R. A. L. Jones

  2. Department of Chemistry, Durham University, DH1 3LE, Durham, UK

    R. L. Thompson

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  1. P. Mokarian-Tabari
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  2. M. Geoghegan
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  3. J. R. Howse
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  5. R. L. Thompson
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  6. R. A. L. Jones
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Mokarian-Tabari, P., Geoghegan, M., Howse, J.R. et al. Quantitative evaluation of evaporation rate during spin-coating of polymer blend films: Control of film structure through defined-atmosphere solvent-casting. Eur. Phys. J. E 33, 283–289 (2010). https://doi.org/10.1140/epje/i2010-10670-7

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