Modifying Fragility and Collective Motion in Polymer Melts with Nanoparticles

Details Modifying Fragility and Collective Motion in Polymer Melts with Nanoparticles Modifying Fragility and Collective Motion in Polymer Melts with Nanoparticles

2011-01-28

arxiv.org/abs/1101.5567v1

Physics

Condensed Matter

Soft Condensed Matter

To appear in Physical Review Letters

Scientific paper

We investigate the impact of nanoparticles (NP) on the fragility and cooperative string-like motion in a model glass-forming polymer melt by molecular dynamics simulation. The NP cause significant changes to both the fragility and the average length of string-like motion, where the effect depends on the NP-polymer interaction and the NP concentration. We interpret these changes via the Adam-Gibbs (AG) theory, assuming the strings can be identified with the "cooperatively rearranging regions" of AG. Our findings indicate fragility is primarily a measure of the temperature dependence of the cooperativity of molecular motion.

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