Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY, 13902, USA.
Small. 2013 Oct 11;9(19):3345-51. doi: 10.1002/smll.201202771. Epub 2013 Apr 18.
Understanding the interfacial stress transfer between carbon nanotubes (CNTs) and polymer matrices is of great importance to the development of CNT-reinforced polymer nanocomposites. In this paper, an experimental study is presented of the interfacial strength between individual double-walled CNTs and poly(methyl methacrylate) (PMMA) using an in situ nanomechanical single-tube pull-out testing scheme inside a high-resolution electron microscope. By pulling out individual tubes with different embedded lengths, this work reveals the shear lag effect on the nanotube-polymer interface and demonstrates that the effective interfacial load transfer occurs only within a certain embedded length. These results show that the CNT-PMMA interface possesses an interfacial fracture energy within 0.054-0.80 J/m(2) and a maximum interfacial strength within 85-372 MPa. This work is useful to better understand the local stress transfer on nanotube-polymer interfaces.
了解碳纳米管（CNTs）与聚合物基体之间的界面应力传递对于开发 CNT 增强聚合物纳米复合材料至关重要。本文采用高分辨率电子显微镜内的原位纳米力学单管拔出测试方案，对单根双壁 CNT 与聚甲基丙烯酸甲酯（PMMA）之间的界面强度进行了实验研究。通过拔出具有不同嵌入长度的单根管子，本工作揭示了剪切滞后效应对纳米管-聚合物界面的影响，并证明有效界面载荷传递仅在一定的嵌入长度内发生。这些结果表明，CNT-PMMA 界面具有 0.054-0.80 J/m²的界面断裂能和 85-372 MPa 的最大界面强度。这项工作有助于更好地理解纳米管-聚合物界面上的局部应力传递。
