Nanoplastic Interactions of Surface-Grafted Single-Walled Carbon Nanotubes with Glassy Polymer Chains in Nanocomposites
Nanoplastic Interactions of Surface-Grafted Single-Walled Carbon Nanotubes with Glassy Polymer Chains in Nanocomposites
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纳米复合材料中表面接枝单壁碳纳米管与玻璃状聚合物链的纳米塑性相互作用
DOI：
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发表时间：
2010
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影响因子：
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通讯作者：
A. Yang
中科院分区：
文献类型：
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作者：
Chih;A. Yang
揭示了纳米复合材料中玻璃态大分子和分散的单壁碳纳米管（SWCNTs）在很大的局部拉伸过程中的纳米级相互作用。研究结果还揭示了在脆性纳米塑料流动过程中，玻璃链遵循的分子运动的独特模式。基于原子力和电子显微镜结果的详细纳米力学计算，发现“应变软化”的玻璃态聚合物链的分子运动高度依赖于链缠结密度（νe），与ν e独立的弹性增强形成鲜明对比。特别地，在松散缠结的链中，单壁碳纳米管表现得像“幻影管”，在塑性流动期间对链网络的应变硬化没有影响。这表明，“玻璃”链经历了纠缠集群，一种新的和独特的模式的非仿射分子运动。这一结果对揭示玻璃态高分子链的基本行为和研究玻璃态高分子的微观结构具有重要意义。
The nanoscopic interactions between glassy macromolecules and the dispersed single-walled carbon nanotubes (SWCNTs) in a nanocomposite during very large local elongations were revealed. The results also unveiled a unique mode of molecular motions followed by glassy chains during brittle nanoplastic flows. Based on detailed nanomechanical calculations on results from atomic force and electron microscopy, the molecular motions of the “strain-softened” glassy polymer chains were found highly dependent on chain entanglement density (νe), in sharp contrast to the νe-independent elastic reinforcement. Particularly, in the loosely entangled chains the SWCNTs behaved like “phantom tubes”, manifesting no effects on strain hardening of the chain network during plastic flow. This indicates that the “glassy” chains had undergone entanglement clustering, a new and unique mode of nonaffine molecular motions. The results bear important significance in revealing the fundamental behavior of glassy polymer chains and the r...