Theory of Nanoparticle Diffusion in Unentangled and Entangled Polymer Melts.

Yamamoto, U.; Schweizer, Kenneth

doi:10.1063/1.3664863

Theory of Nanoparticle Diffusion in Unentangled and Entangled Polymer Melts.

Journal Article · Fri Dec 31 23:00:00 EST 2010 · The Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3664863· OSTI ID:1034709

Yamamoto, U. ^[1]; Schweizer, Kenneth ^[1]

University of Illinois

We propose a statistical dynamical theory for the violation of the hydrodynamic Stokes-Einstein (SE) diffusion law for a spherical nanoparticle in entangled and unentangled polymer melts based on a combination of mode coupling, Brownian motion, and polymer physics ideas. The non-hydrodynamic friction coefficient is related to microscopic equilibrium structure and the length-scale-dependent polymer melt collective density fluctuation relaxation time. When local packing correlations are neglected, analytic scaling laws (with numerical prefactors) in various regimes are derived for the non-hydrodynamic diffusivity as a function of particle size, polymer radius-of-gyration, tube diameter, degree of entanglement, melt density, and temperature. Entanglement effects are the origin of large SE violations (orders of magnitude mobility enhancement) which smoothly increase as the ratio of particle radius to tube diameter decreases. Various crossover conditions for the recovery of the SE law are derived, which are qualitatively distinct for unentangled and entangled melts. The dynamical influence of packing correlations due to both repulsive and interfacial attractive forces is investigated. A central finding is that melt packing fraction, temperature, and interfacial attraction strength all influence the SE violation in qualitatively different directions depending on whether the polymers are entangled or not. Entangled systems exhibit seemingly anomalous trends as a function of these variables as a consequence of the non-diffusive nature of collective density fluctuation relaxation and the different response of polymer-particle structural correlations to adsorption on the mesoscopic entanglement length scale. The theory is in surprisingly good agreement with recent melt experiments, and new parametric studies are suggested.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1034709

Journal Information:: The Journal of Chemical Physics, Journal Name: The Journal of Chemical Physics Journal Issue: n/a Vol. 135; ISSN JCPSA6; ISSN 0021-9606

Country of Publication:: United States

Language:: English

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Theory of Nanoparticle Diffusion in Unentangled and Entangled Polymer Melts.

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