Rheological Role of Stiff Nanorings on Concurrently Strengthening and Toughening Polymer Nanocomposites,ACS Macro Letters

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Rheological Role of Stiff Nanorings on Concurrently Strengthening and Toughening Polymer Nanocomposites
ACS Macro Letters ( IF 5.1 ) Pub Date : 2023-01-24 , DOI: 10.1021/acsmacrolett.2c00610
Yu-Chao Li ₁ , Zong-Pei Wu ₁ , Ze-Hao Zong ₁ , Xue-Zheng Cao ₁

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Nanorings, which are increasingly uncovered in natural systems and synthesized in man-made materials, exhibit dynamics distinct from those known for linear chains. We show in this study that, when immersed in a polymer melt matrix, segments of a stiff nanoring (SNR) have more facilitated subdiffusion, i.e., with a larger scaling exponent in the mean squared displacement, than those belonging to one flexible counterpart, while the whole SNR is more suppressed by its surroundings. It is revealed that adding SNRs contributes to achieving the long-anticipated rheological objective of sol- and gel-like characteristics at high and low shearing frequencies, respectively. This study suggests the promising prospect of exploiting SNRs to concurrently strengthen and toughen target polymer nanocomposites.

中文翻译：

刚性纳米环对同时强化和增韧聚合物纳米复合材料的流变学作用

越来越多地在自然系统中发现并在人造材料中合成的纳米环表现出不同于已知线性链的动力学。我们在这项研究中表明，当浸入聚合物熔体基质中时，刚性纳米环 (SNR) 的片段比属于一个柔性纳米环的片段更容易扩散，即在均方位移中具有更大的标度指数，而整个 SNR 受到周围环境的抑制。据透露，添加 SNR 有助于分别在高剪切频率和低剪切频率下实现期待已久的类溶胶和类凝胶特性的流变学目标。这项研究表明利用 SNR 同时增强和增韧目标聚合物纳米复合材料的前景广阔。

更新日期：2023-01-24

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