Bio-Inspired Carbon Nanotube-Polymer Composite Yarns with Hydrogen Bond-Mediated Lateral Interactions
Bio-Inspired Carbon Nanotube-Polymer Composite Yarns with Hydrogen Bond-Mediated Lateral Interactions
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DOI：
10.1021/nn400346r
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发表时间：
2013-04-01
期刊：
影响因子：
17.1
通讯作者：
Espinosa, Horacio D.
中科院分区：
文献类型：
--
作者：
Beese, Allison M.;Sarkar, Sourangsu;Espinosa, Horacio D.
已开发出含有高负载量的双壁碳纳米管（DWNT）的聚合物复合纱线，其中DWNT束表面上的固有的丙烯酸酯基有机涂层通过广泛的氢键网络与聚（乙烯醇）（PVA）强烈地相互作用。这种设计利用了蜘蛛丝和胶原蛋白中的增韧机制，它们含有丰富的氢键，可以断裂和改革，允许大变形，同时保持结构稳定性。与在天然材料中观察到的类似，聚合物基质在大变形下的展开增加了延展性而不牺牲刚度。随着复合材料中PVA含量的增加，复合材料的刚度和失效能量也增加到最佳点，超过该最佳点，拉伸机械性能降低。分子动力学（MD）模拟证实了这一趋势，显示在高PVA含量，润滑DWNTs之间的界面的PVA分子之间的非生产性氢键的主导地位。
Polymer composite yams containing a high loading of double-walled carbon nanotubes (DWNTs) have been developed in which the inherent acrylate-based organic coating on the surface of the DWNT bundles interacts strongly with poly(vinyl alcohol) (PVA) through an extensive hydrogen-bond network. This design takes advantage of a toughening mechanism seen in spider silk and collagen, which contain an abundance of hydrogen bonds that can break and reform, allowing for large deformation while maintaining structural stability. Similar to that observed in natural materials, unfolding of the polymeric matrix at large deformations increases ductility without sacrificing stiffness. As the PVA content in the composite increases, the stiffness and energy to failure of the composite also increases up to an optimal point, beyond which mechanical performance in tension decreases. Molecular dynamics (MD) simulations confirm this trend, showing the dominance of nonproductive hydrogen bonding between PVA molecules at high PVA contents, which lubricates the interface between DWNTs.