Percolation model of interfacial effects in polymeric glasses
نویسندگان
چکیده
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. PACS. 64.70.pj Polymers – 64.70.QTheory and modeling of the glass transition – 68.08.-p Liquid-solid
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