Nonmonotonic Strain Rate Dependence on the Strain Hardening of Polymer Nanocomposites,ACS Macro Letters

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Nonmonotonic Strain Rate Dependence on the Strain Hardening of Polymer Nanocomposites
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-08-17 , DOI: 10.1021/acsmacrolett.0c00525
Ruikun Sun ₁ , Matthew Melton ₁ , Xiaobing Zuo ₂ , Shiwang Cheng ₁

Affiliation

This Letter investigates the external deformation on modifying the polymer–nanoparticle (NP) and NP–NP interactions as well as their influences on the macroscopic properties of polymer nanocomposites (PNCs). Specifically, the applied uniaxial extension brings together the NPs along the transverse stretching direction and catalyzes the percolation transition from the initially well-dispersed NPs in the PNCs. The percolated NP network thus increases the strength of PNCs and leads to a strong surge in the elongation viscosity at very low strain rates, exhibiting the unexpected nonmonotonic strain rate dependence on the strain hardening. These results reveal explicitly the unconventional roles of the external deformation on modulating the relative strength of the polymer–NP and the NP–NP interactions, enabling advanced structures and properties control of PNCs.

中文翻译：

非单调应变率对聚合物纳米复合材料应变硬化的依赖性

这封信研究了改变聚合物-纳米颗粒 (NP) 和 NP-NP 相互作用的外部变形以及它们对聚合物纳米复合材料 (PNC) 宏观性质的影响。具体来说，施加的单轴延伸将 NPs 沿横向拉伸方向聚集在一起，并催化 PNCs 中最初分散良好的 NPs 的渗流转变。因此，渗透的 NP 网络增加了 PNC 的强度，并导致在非常低的应变率下伸长粘度的强烈激增，表现出意想不到的非单调应变率对应变硬化的依赖性。这些结果明确地揭示了外部变形对调节聚合物-NP的相对强度和NP-NP相互作用的非常规作用，

更新日期：2020-09-15

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