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Issue 28, 2018
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Effect of copolymer sequence on structure and relaxation times near a nanoparticle surface

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Abstract

We simulate a simple nanocomposite consisting of a single spherical nanoparticle surrounded by coarse-grained polymer chains. The polymers are composed of two different monomer types that differ only in their interaction strengths with the nanoparticle. We examine the effect of adjusting copolymer sequence on the structure as well as the end-to-end vector autocorrelation, bond vector autocorrelation, and self-intermediate scattering function relaxation times as a function of distance from the nanoparticle surface. We show how the range and magnitude of the interphase of slowed dynamics surrounding the nanoparticle depend strongly on sequence blockiness. We find that, depending on block length, blocky copolymers can have faster or slower dynamics than a random copolymer. Certain blocky copolymer sequences lead to relaxation times near the nanoparticle surface that are slower than those of either homopolymer system. Thus, tuning copolymer sequence could allow for significant control over the nanocomposite behavior.

Graphical abstract: Effect of copolymer sequence on structure and relaxation times near a nanoparticle surface

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Publication details

The article was received on 11 May 2018, accepted on 28 Jun 2018 and first published on 28 Jun 2018


Article type: Paper
DOI: 10.1039/C8SM00976G
Citation: Soft Matter, 2018,14, 5913-5921
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    Effect of copolymer sequence on structure and relaxation times near a nanoparticle surface

    A. J. Trazkovich, M. F. Wendt and L. M. Hall, Soft Matter, 2018, 14, 5913
    DOI: 10.1039/C8SM00976G

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