Solvent evaporation of spin cast films: crust effects

Details Solvent evaporation of spin cast films: crust effects Solvent evaporation of spin cast films: crust effects

2001-11-07

arxiv.org/abs/cond-mat/0111117v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 2 EPS figures. submitted to Europ. Phys. J. (E)

Scientific paper

10.1140/epje/i200101169

When a glassy polymer film is formed by evaporation, the region near the free surface is polymer rich and becomes glassy first, as noticed long ago by Scriven et al. We discuss the thickness of this "crust" and the time interval where it is present -before freezing of the whole film. We argue that the crust is under mechanical tension, nd should form some cracks. This may be the source of the roughness observed on the final, dry films, when the solvent vapor pressure is high (and leads to thin crusts).

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