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Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites
作者:L.-J. Dai, C.-L. Fu, Y.-L. Zhu, Z.-W. Li, Z.-Y. Sun
關鍵字:Weakly Attractive Nanocomposites
論文來源:期刊
具體來源:Chin J Polym Sci (2019). https://doi.org/10.1007/s10118-020-2352-7
發表時間:2019年
In this paper, 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. Citation: 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. 2019.Accepted.
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