 We explore the dynamics of entangled polymer chains embedded into nanocomposites. From primitive path analysis, highly entangled polymer chains are found to be significantly disentangled during increment of the volume fraction of spherical non-attractive nanoparticles (NPs) from 0 to 42%. A critical volume fraction, φc = 31%, is found to control the crossover from polymer chain entanglements to `NP entanglements'. While below φc, the polymer chain relaxation accelerates upon filling, above φc, the situation reverses: Polymer dynamics becomes geometrically constrained upon adding NPs. Our findings provide a microscopic understanding of the dynamics of entangled polymer chains inside their composites, and they offer an explanation for the unusual rheological properties of polymer composites.
for LaTeX users @article{YLi2012-109,
author = {Y. Li and M. Kr\"oger and W. K. Liu},
title = {Nanoparticle effect on the dynamics of polymer chains and their entanglement network},
journal = {Phys. Rev. Lett.},
volume = {109},
pages = {118001},
year = {2012}
}
\bibitem{YLi2012-109} Y. Li, M. Kr\"oger, W.K. Liu,
Nanoparticle effect on the dynamics of polymer chains and their entanglement network,
Phys. Rev. Lett. {\bf 109} (2012) 118001.YLi2012-109
Y. Li, M. Kr\"oger, W.K. Liu
Nanoparticle effect on the dynamics of polymer chains and their entanglement network
Phys. Rev. Lett.,109,2012,118001 |
mk@mat.ethz.ch
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