Unzipped Multiwalled Carbon Nanotube Oxide/Multiwalled Carbon Nanotube Hybrids for Polymer Reinforcement
Unzipped Multiwalled Carbon Nanotube Oxide/Multiwalled Carbon Nanotube Hybrids for Polymer Reinforcement
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DOI：
10.1021/am301623t
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发表时间：
2012-11-01
影响因子：
9.5
通讯作者：
Yin, Jie
中科院分区：
文献类型：
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作者：
Fan, Jinchen;Shi, Zixing;Yin, Jie
多壁碳纳米管（MWNTs）作为高分子材料的纳米填料得到了广泛的应用。然而，由于纳米碳纳米管在聚合物基体中的可用界面面积有限，限制了纳米碳纳米管的应用。氧化解压缩是解决这一问题的有效途径。解压缩多壁碳纳米管氧化物（unzipped multi壁carbon nanotubes oxide， UMCNOs）在低质量分数下表现出优异的增强效果，但在较高载荷下UMCNOs的团聚仍然阻碍了聚合物复合材料的机械增强。在本文中，我们有趣地发现，原始mwnt的组合可以显著改善UMCNOs在聚合物基质中的分散。通过将原始MWNTs加入UMCNOs水分散体中，然后进行超声处理，可以很容易地获得MWNTs和UMCNOs的混合物（U/Ms）。通过pi堆叠相互作用，UMCNOs被附着在mwnt的外壁上。通过多次测量表征了U/Ms的形态和结构。对合成的聚乙烯醇（PVA）基复合材料的力学性能进行了测试，结果表明，U/Ms可以作为理想的增强填料。与PVA相比，当载荷为0.7 wt %时，U/M-PVA复合材料的屈服强度和杨氏模量分别接近145.8 MPa和6.9 GPa，分别提高了107.4%和122.5%。拉伸试验结果表明，由于UMCNOs和MWNTs的协同作用，U/Ms的加固效果优于单个UMCNOs和MWNTs。
Multiwalled carbon nanotubes (MWNTs) have been widely used as nanofillers for polymer reinforcement. However, it has been restricted by the limited available interface area of MWNTs in the polymer matrices. Oxidation unzipping of MWNTs is an effective way to solve this problem. The unzipped multiwalled carbon nanotube oxides (UMCNOs) exhibit excellent enhancement effect with low weight fractions, but agglomeration of UMCNOs at a relatively higher loading still hampered the mechanical reinforcement of polymer composites. In this paper, we interestingly found that the dispersion of UMCNOs in polymer matrices can be significantly improved with the combination of pristine MWNTs. The hybrids of MWNTs and UMCNOs (U/Ms) can be easily obtained by adding the pristine MWNTs into the UMCNOs aqueous dispersion, followed by sonication. With a pi-stacking interaction, the UMCNOs were attached onto the outwalls of MWNTs. The morphologies and structure of the U/Ms were characterized by several measurements. The mechanical testing of the resultant poly(vinyl alcohol) (PVA)-based composites demonstrated that the U/Ms can be used as ideal reinforcing fillers. Compared to PVA, the yield strength and Young's modulus of U/M-PVA composites with a loading of 0.7 wt % of the U/Ms approached similar to 145.8 MPa and 6.9 GPa, respectively, which are increases of similar to 107.4% and similar to 122.5%, respectively. The results of tensile tests demonstrated that the reinforcement effect of U/Ms is superior to the individual UMCNOs and MWNTs, because of the synergistic interaction of UMCNOs and MWNTs.