Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites

Probing Intermittent Motion of Polymer Chains in Weakly Attractive Nanocomposites
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探测弱吸引力纳米复合材料中聚合物链的间歇运动

DOI:
10.1007/s10118-020-2352-7
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发表时间:
2019-11
影响因子:
4.3
通讯作者:
Sun Zhao-Yan
Sun Zhao-Yan
中科院分区:
化学2区
文献类型:
--
作者:
Dai Li-Jun;Fu Cui-Liu;Zhu You-Liang;Li Zhan-Wei;Sun Zhao-Yan

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在这项研究中,我们研究了聚合物/纳米粒子复合材料中的聚合物链段的运动,通过改变纳米粒子(NP)的体积分数。通过对链段位移、链段轨迹和链段平方位移的概率分布的研究,发现聚合物纳米复合材料中链段的运动是间歇性的,同时伴随着慢链段和快链段的共存。段的位移分布呈现指数尾,而不是高斯形式。链段的间歇动力学由长程跳跃运动和短程局域运动组成,这是由NP与链段之间的弱吸引相互作用和NP诱导的强约束所介导的。同时,链段的间歇运动在低颗粒负荷下可以用吸附-脱附转变来描述,在高颗粒负荷下可以用约束效应来描述。这些发现可能为理解纳米粒子存在下聚合物链的异常运动提供重要信息。
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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影响因子: 16.6
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