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Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites

  • Li-Jun Dai
  • Cui-Liu Fu
  • You-Liang Zhu
  • Zhan-Wei Li
  • Zhao-Yan SunEmail author
Article
  • 9 Downloads

Abstract

In this study, we investigate the motion of polymer segments in polymer/nanoparticle composites by varying nanoparticle (NP) volume fractions. By studying the probability distribution of segment displacement, segment trajectory, and the square displacement of segment, we find the intermittent motion of segments, accompanied with the coexistence of slow and fast segments in polymer nanocomposites (PNCs). The displacement distribution of segments exhibits an exponential tail, rather than a Gaussian form. The intermittent dynamics of chain segments is comprised of a long-range jump motion and a short-range localized motion, which is mediated by the weakly attractive interaction between NP and chain segment and the strong confinement induced by NPs. Meanwhile, the intermittent motion of chain segments can be described by the adsorption-desorption transition at low particle loading and confinement effect at high particle loading. These findings may provide important information for understanding the anomalous motion of polymer chains in the presence of NPs.

Keywords

Nanocomposites Intermittent dynamics The probability distribution of displacement Confinement Adsorption-desorption mechanism 

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Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 21790344, 21833008, 21774129), the National Key R&D Program of China (No. 2018YFB0703701), the Jilin Provincial science and technology development program (No. 20190101021JH), and the Key Research Program of Frontier Sciences, CAS (No. QYZDY-SSWSLH027).

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10118_2020_2352_MOESM1_ESM.pdf (447 kb)
Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites

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Copyright information

© Chinese Chemical Society Institute of Chemistry, Chinese Academy of Sciences Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Li-Jun Dai
    • 1
    • 2
  • Cui-Liu Fu
    • 1
  • You-Liang Zhu
    • 1
  • Zhan-Wei Li
    • 1
  • Zhao-Yan Sun
    • 1
    • 2
    Email author
  1. 1.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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