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We investigate the impact of the addition of nanoparticles (NP) on thefragility of a model glass-forming polymer melt by molecular dynamicssimulations. We find significant changes in fragility for nanoparticle volumefractions $\phi$ exceeding $\approx$ 5%, where fragility changes correlate withthe inverse variance of the magnitude of the Debye-Waller factor $<u^2>$, ameasure of local "stiffness" fluctuations. We also confirm the validity of theBuchenau relationship between $<u^2>$ and the structural relaxation time $\tau$for all $\phi$ and polymer-NP interaction types.

Influence of Nanoparticle Additives on the Fragility of Polymer Glass Formation and the Buchenau Relation