We study the dynamics of nanoparticles in semidilute solutions of ring and linear polymers using hybrid molecular dynamics–multiparticle collision dynamics simulations. The dynamics of the monomers, the polymer centers-of-mass, and the nanoparticles coincide for these two architectures for solutions of the same monomer concentration. The long time diffusivities of the nanoparticles follow the predictions of a polymer coupling theory [Cai et al., Macromolecules 44, 7853–7863 (2011)], suggesting that nanoparticle dynamics are coupled to segmental relaxations for both polymer architectures examined here. At intermediate time scales, the nanoparticle dynamics are characterized by subdiffusive exponents, which markedly deviate from coupling theory and closely follow those of the polymers. Instead, the nanoparticle dynamics are strongly coupled to the polymer center-of-mass motions for both architectures, rather than to their segmental dynamics. The presence of ring concatenations does not affect the long-time diffusivity of the nanoparticles but leads to a slight decrease in the subdiffusive exponents of the nanoparticles and the polymer center-of-mass.
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July 2021
Research Article|
July 01 2021
Nanoparticle dynamics in semidilute polymer solutions: Rings versus linear chains
Special Collection:
Ring Polymers
Renjie Chen;
Renjie Chen
1
Department of Chemical and Biomolecular Engineering, University of Houston
, Houston, Texas 77204
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Shivraj B. Kotkar
;
Shivraj B. Kotkar
1
Department of Chemical and Biomolecular Engineering, University of Houston
, Houston, Texas 77204
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Ryan Poling-Skutvik
;
Ryan Poling-Skutvik
2
Department of Chemical Engineering, University of Rhode Island
, Kingston, Rhode Island 02881
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Michael P. Howard
;
Michael P. Howard
3
Department of Chemical Engineering, Auburn University
, Auburn, Alabama 36849
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Arash Nikoubashman
;
Arash Nikoubashman
4
Institute of Physics, Johannes Gutenberg University Mainz
, Staudingerweg 7, 55128 Mainz, Germany
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Jacinta C. Conrad
;
Jacinta C. Conrad
a)
1
Department of Chemical and Biomolecular Engineering, University of Houston
, Houston, Texas 77204
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Jeremy C. Palmer
Jeremy C. Palmer
b)
1
Department of Chemical and Biomolecular Engineering, University of Houston
, Houston, Texas 77204b)Author to whom correspondence should be addressed; electronic mail: [email protected]
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a)
Electronic mail: [email protected]
b)Author to whom correspondence should be addressed; electronic mail: [email protected]
Note: This paper is part of the special issue on Ring Polymers.
J. Rheol. 65, 745–755 (2021)
Article history
Received:
January 08 2021
Accepted:
April 19 2021
Citation
Renjie Chen, Shivraj B. Kotkar, Ryan Poling-Skutvik, Michael P. Howard, Arash Nikoubashman, Jacinta C. Conrad, Jeremy C. Palmer; Nanoparticle dynamics in semidilute polymer solutions: Rings versus linear chains. J. Rheol. 1 July 2021; 65 (4): 745–755. https://doi.org/10.1122/8.0000223
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