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Structure and Dynamics of Interacting Nanoparticles in Semidilute Polymer Solutions [electronic resource].

Published
Arlington, Va. : National Science Foundation (U.S.), 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 6,568-6,577 : digital, PDF file
Additional Creators
Argonne National Laboratory, National Science Foundation (U.S.), United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We investigate the structure and dynamics of silica nanoparticles and polymer chains in semidilute solutions of high molecular weight polystyrene in 2-butanone to determine the effect of long-range interparticle interactions on the coupling between particle and polymer dynamics. Particles at concentrations of 1–10 wt % are well dispersed in the semidilute polymer solutions and exhibit long-range electrostatic repulsions between particles. Because the particles are comparably sized to the radius of gyration of the polymer, the particle dynamics is predicted to couple to that of the polymer. We verify that the polymer structure and dynamics are not significantly affected by the particles, indicating that the particle–polymer coupling does not change with increasing particle loading. We find that the coupling between the dynamics of comparably sized particles and polymer results in subdiffusive particle dynamics, as expected. Over the interparticle distance, however, the particle dynamics is hindered and not fully described by the relaxation of the surrounding polymer chains. Instead, the particle dynamics is inversely related to the structure factor, suggesting that physical particle–polymer coupling on short length scales and interparticle interactions on long length scales both present energetic barriers to particle motion that lead to subdiffusive dynamics and de Gennes narrowing, respectively.
Report Numbers
E 1.99:1339527
Subject(s)
Note
Published through SciTech Connect.
08/17/2016.
"132927"
Macromolecules 49 17 ISSN 0024-9297 AM
Ryan Pollng-Skutvik; Katrina Irene S. Mongcopa; Antonio Faraone; Suresh Narayanan; Jacinta C. Conrad; Ramanan Krishnamoorti.
Robert A. Welch Foundation
Funding Information
AC02-06CH11357
View MARC record | catkey: 24043850