Multiwalled Carbon Nanotube Reinforced Epoxy Nanocomposites for Vibration Damping
Multiwalled Carbon Nanotube Reinforced Epoxy Nanocomposites for Vibration Damping
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DOI：
10.1021/acsanm.8b01865
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发表时间：
2019-02-01
影响因子：
5.9
通讯作者：
Haridoss, Prathap
中科院分区：
文献类型：
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作者：
Joy, Anand;Varughese, Susy;Haridoss, Prathap
将多壁碳纳米管（CNTs）作为环氧树脂的增强体，用端羧基丁二烯丙烯腈（CTBN）和双酚A二缩水甘油醚（DGEBA）的嵌段共聚物加合物改性环氧树脂。微观结构分析揭示了具有球形形态的相在连续相中的均匀分散。球形颗粒的平均直径随着CNT和加合物含量的增加而增加。在30重量%的加合物，添加碳纳米管的结果在异常的球形颗粒的生长。通过悬臂梁模态下的自由振动试验，确定了前两种模态的损耗因子。对于用30重量%加合物和所有重量%CNT改性的环氧纳米复合材料，获得损耗因子的显著增加（即，0.5、1和2.5）。该纳米复合材料中的振动阻尼机制可能是由于动态载荷期间球形颗粒的相对滑动，这消耗了能量。球形颗粒之间的距离的减小以及连续相的弹性模量的减小促进相对滑动。
Multiwalled carbon nanotubes (CNTs) are used as reinforcement in epoxy modified with adduct, that is, block copolymer of carboxyl-terminated butadiene acrylonitrile (CTBN) and diglycidyl ether of bisphenol A (DGEBA). Microstructure analysis reveals uniform dispersion of a phase with spherical morphology in a continuous phase. The mean diameter of the spherical particles increased with CNT and adduct content. At 30 wt % adduct, adding CNTs results in exceptional growth of spherical particles. Loss factors in the first two modes were determined by using free vibration test in cantilever mode. Significant increase in loss factor is obtained for the epoxy nanocomposites modified with 30 wt % adduct and at all wt % CNTs (i.e., 0.5, 1, and 2.5). The vibration damping mechanism in this nanocomposite is likely due to the relative sliding of spherical particles during dynamic loads, which dissipates energy. The reduction in the distance between spherical particles as well as the reduction in the elastic modulus of continuous phase facilitate relative sliding.