Percolation model of interfacial effects in polymeric glasses |
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| Authors: | J.E.G. Lipson and S. T. Milner |
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| Affiliation: | (2) Department of Chemistry and Chemical Biology, Cornell University, Ithaca, USA;(3) School of Chemistry and Chemical Biology, University College Dublin, Dublin, Ireland; |
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| Abstract: | Recent observations using fluorophore probes of local dynamics in polymer films have provided new insight into the glass transition. Using a percolation model, we predict the local Tg in a polymer film, as a function of distance from a substrate or a free surface. Our predictions are in good agreement with the observed elevation of Tg near a substrate, whereas the observed reduction of Tg near a free surface is too strong to be accounted for by percolation effects. |
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