Effects of nanotube modification on the dielectric behaviors and mechanical properties of multiwall carbon nanotubes/epoxy composites
Effects of nanotube modification on the dielectric behaviors and mechanical properties of multiwall carbon nanotubes/epoxy composites
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DOI：
10.1002/pen.23277
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发表时间：
2013-02
影响因子：
3.2
通讯作者：
Xiusheng Guo;Demei Yu;Jingshen Wu;C. Min;Rong Guo
中科院分区：
文献类型：
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作者：
Xiusheng Guo;Demei Yu;Jingshen Wu;C. Min;Rong Guo
通过三种方法对多壁碳纳米管（MWNT）进行改性，即氧化管和两端开口、用Ag填充管和用己二胺接枝管。通过将环氧树脂与管材熔融混合来制备改性MWNT/环氧树脂复合材料。透射电子显微镜图像表明，改性的MWNT可以均匀地分散在环氧树脂基体中。研究了复合材料的介电行为和机械性能。与环氧树脂基体相比，改性MWNT/环氧树脂复合材料的介电和机械性能得到显着改善。相同填料含量为 1.1 wt% 时，Ag 填充、开孔和接枝 MWNT 复合材料的拉伸强度分别比纯环氧树脂高约 30.5%、35.6% 和 27.4%。填料含量为 1.1 wt% 的接枝 MWNT/环氧树脂复合材料的悬臂梁缺口冲击强度大约是纯环氧树脂的四倍。在低频范围内观察到含有 1.1 wt% Ag 填充纳米管的复合材料的介电常数约为 150，比环氧树脂基体的介电常数高约 40 倍。纳米管的适当改性提供了一种改善聚合物基复合材料性能的方法。聚合物。 ENG。 SCI.，2013。© 2012 塑料工程师协会
Multiwall carbon nanotubes (MWNTs) were modified by three methods, namely, oxidizing the tubes and opening both ends, filling the tubes with Ag, and grafting the tubes with hexamethylene diamine. Modified MWNTs/epoxy composites were prepared by melt-mixing epoxy resin with the tubes. Transmission electron microscope images showed that the modified MWNTs can be dispersed in the epoxy matrix homogeneously. The dielectric behaviors and mechanical properties of the composites were investigated. The dielectric and mechanical properties of the modified MWNTs/epoxy composites were considerably improved compared with those of the epoxy matrix. The tensile strengths of the Ag-filled, opened, and grafted MWNTs composites at the same filler content of 1.1 wt% were higher by ∼30.5%, 35.6%, and 27.4%, respectively, than that of neat epoxy. The Izod notched impact strength of the grafted MWNTs/epoxy composite with filler content of 1.1 wt% was approximately four times higher than that of neat epoxy. A dielectric constant of ∼150 of the composite with 1.1 wt% Ag-filled nanotubes was observed in the low-frequency range, which was ∼40 times higher than that of the epoxy matrix. The proper modification of nanotubes provides a way to improve the properties of the polymer-based composites. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers