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We introduce a model for polymer solutions and blends that display both an upper and a lower critical solution temperature (UCST, LCST). Using our simple analytic lattice theory along with a fixed parameter set independent of both composition and temperature, we study solutions and blends exhibiting complicated miscibility patterns, including cases in which a UCST is below an LCST, or above. With...
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...
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