Abstract.
The interdependence of solvent loss and vitrification in spin-cast poly(methyl methacrylate) thin films is explored. Fast measurements of decreases in film thickness, achieved with ellipsometry, indicate that the rate of solvent (toluene) loss decreases sharply when the solvent volume fraction φ solv falls below about 0.15 and the film vitrifies. Ellipsometry and microgravimetry show that solvent is lost from a glassy thin film (150 nm thick) over of a period of more than ten hours, which is much longer than would be required if it was limited by diffusion in the glass. These results support the recently-proposed idea that the compression of the glass creates an energy barrier that slows down solvent loss.
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Richardson, H., Sferrazza, M. & Keddie, J. Influence of the glass transition on solvent loss from spin-cast glassy polymer thin films. Eur. Phys. J. E 12 (Suppl 1), 87–91 (2003). https://doi.org/10.1140/epjed/e2003-01-021-5
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DOI: https://doi.org/10.1140/epjed/e2003-01-021-5