Abstract
We present the results of a facilitated kinetic Ising model based investigation of the confinement and filler-induced changes in the glass transition, fragility, and aging dynamics of a model system. This work is motivated by the issue of relationships, if any, in the glass transition phenomena of polymer nanocomposites and polymer thin films. Our results suggest that addition of plasticizing fillers lower the Tg and increase the fragility of the system, while antiplasticizing fillers have an opposite effect. Confinement arising in freely suspended films of both filled and unfilled systems were seen to reduce the overall Tg of the system. Confinement and filler-induced shifts in the Tg were not found to be quantitatively equivalent when compared at the appropriate film thicknesses and interparticle spacings. However, the fragilities exhibited a trend that suggests a closer quantitative equivalence between the PNCs and thin films. In all the cases we examined, the aging dynamics and nonequilibrium relaxati...
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