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

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

2009-06-29

arxiv.org/abs/0906.5275v1

Physics

Condensed Matter

Materials Science

Scientific paper

We investigate the impact of the addition of nanoparticles (NP) on the fragility of a model glass-forming polymer melt by molecular dynamics simulations. We find significant changes in fragility for nanoparticle volume fractions $\phi$ exceeding $\approx$ 5%, where fragility changes correlate with the inverse variance of the magnitude of the Debye-Waller factor $$, a measure of local "stiffness" fluctuations. We also confirm the validity of the Buchenau relationship between $$ and the structural relaxation time $\tau$ for all $\phi$ and polymer-NP interaction types.

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