a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.University of Chinese Academy of Sciences, Beijing 100049, China
zysun@ciac.ac.cn
收稿:2019-07-26,
修回:2019-8-24,
录用:2019-9-2,
网络首发:2019-11-28,
纸质出版:2020-06
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Dai, L. J.; Fu, C. L.; Zhu, Y. L.; Li, Z. W.; Sun, Z. Y. Probing intermittent motion of polymer chains in weakly attractive nanocomposites. Chinese J. Polym. Sci. 2020, 38, 620–628
Li-Jun Dai, Cui-Liu Fu, You-Liang Zhu, et al. Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites[J]. Chinese Journal of Polymer Science, 2020, 38(6): 620-628.
Dai, L. J.; Fu, C. L.; Zhu, Y. L.; Li, Z. W.; Sun, Z. Y. Probing intermittent motion of polymer chains in weakly attractive nanocomposites. Chinese J. Polym. Sci. 2020, 38, 620–628 DOI: 10.1007/s10118-020-2352-7.
Li-Jun Dai, Cui-Liu Fu, You-Liang Zhu, et al. Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites[J]. Chinese Journal of Polymer Science, 2020, 38(6): 620-628. DOI: 10.1007/s10118-020-2352-7.
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.
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