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Microscopic Theory of the Long-Time Diffusivity and Intermediate-Time Anomalous Transport of a Nanoparticle in Polymer Melts

Journal Article · · Macromolecules
DOI:https://doi.org/10.1021/ma501150q· OSTI ID:1875672
 [1];  [2]
  1. Univ. of Illinois, Urbana, IL (United States); University of Illinois
  2. Univ. of Illinois, Urbana, IL (United States)
The transport of a single nanoparticle in unentangled and entangled polymer melts is studied based on a microscopic, force-level, self-consistent generalized Langevin equation approach. Nanoparticle self-motion and length-scale-dependent polymer relaxation enter as two parallel and competing channels of force relaxation. For entangled melts, particle long-time mobility exhibits size-dependent non-Stokes–Einstein behaviors controlled by (i) fast diffusion and length-scale-dependent collective relaxation of the unentangled matrix for particles smaller than the tube diameter and (ii) polymer relaxation via reptation for nanoparticles larger than the tube diameter. The two regimes are connected by a relatively sharp but continuous crossover. Recovery of hydrodynamic behavior requires the nanoparticle to be roughly 10 times larger than the tube diameter. Theoretical predictions for the diffusion constant are in good agreement with recent simulations of unentangled and lightly entangled melts, including the crossover regime where the nanoparticle and tube diameters are roughly equal. The calculations are also in reasonable accord with several experiments in entangled synthetic polymer melts and DNA solutions, although the activated hopping motion not included in the present theory may be important in a narrow intermediate crossover regime for sufficiently entangled polymers. The predictions of the theory for intermediate-time anomalous diffusion are of mixed quality based on comparison to simulations. Furthermore, the significant limitations identified are associated with our minimalist treatment of collective density fluctuation relaxation on intermediate time and length scales, including the possible importance of non-reptation relaxation processes in entangled melts.
Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46471
OSTI ID:
1875672
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 1 Vol. 48; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Nanoparticle Motion in Entangled Melts of Linear and Nonconcatenated Ring Polymers text January 2017
Interfacial Properties and Hopping Diffusion of Small Nanoparticle in Polymer/Nanoparticle Composite with Attractive Interaction on Side Group journal May 2018
Miscibility and Nanoparticle Diffusion in Ionic Nanocomposites text January 2018
Polymer Grafted Nanoparticle Viscosity Modifiers journal February 2019
Diffusion Mode Transition between Gaussian and Non-Gaussian of Nanoparticles in Polymer Solutions journal March 2019
Translational and rotational dynamics of an ultra-thin nanorod probe particle in linear polymer melts journal January 2018
Influence of polymer flexibility on nanoparticle dynamics in semidilute solutions journal January 2019
Study of active Brownian particle diffusion in polymer solutions journal January 2019
A simulation study on the glass transition behavior and relevant segmental dynamics in free-standing polymer nanocomposite films journal January 2019
Advances in the microrheology of complex fluids journal June 2016
Diffusion of Nanoparticles in Polymer Systems journal November 2018

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