Clay assisted dispersion of carbon nanotubes in conductive epoxy nanocomposites
Clay assisted dispersion of carbon nanotubes in conductive epoxy nanocomposites
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DOI：
10.1002/adfm.200600785
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发表时间：
2007-09-24
影响因子：
19
通讯作者：
Grunlan, Jaime C.
中科院分区：
文献类型：
--
作者：
Liu, Lei;Grunlan, Jaime C.
将粘土引入单壁碳纳米管（SWNT）/环氧树脂复合材料中，以改善纳米管分散性，而不损害导电性或机械性能。与表面活性剂或聚合物分散剂不同，粘土是机械刚性的并且已知可增强性能（例如，模量、阻气性和阻燃性）。将纳米管和粘土结合可以同时增强电学和机械性能。仅用0.05重量%的单壁碳纳米管，电导率增加了超过四个数量级（从10（-9）至10（-5）S cm（-1））与添加0.2重量%的粘土。此外，这些纳米复合材料的逾渗阈值从0.05wt%的单壁碳纳米管降低到0.01wt%的添加粘土。单壁碳纳米管似乎对粘土有亲和力，这使得它们在这些复合材料中变得更加剥落和更好地网络化。这种粘土-纳米管的协同作用可以使这些复合材料更好地适用于各种封装、传感和屏蔽应用。
Clay was introduced into single-walled carbon nanotube (SWNT)/epoxy composites to improve nanotube dispersion without harming electrical conductivity or mechanical performance. Unlike surfactant or polymer dispersants, clay is mechanically rigid and known to enhance the properties (e.g., modulus, gas barrier, and flame retardation) of polymer composites. Combining nanotubes and clay allows both electrical and mechanical behavior to be simultaneously enhanced. With just 0.05 wt % SWNT, electrical conductivity is increased by more than four orders of magnitude (from 10(-9) to 10(-5) S cm(-1)) with the addition of 0.2 wt % clay. Furthermore, the percolation threshold of these nanocomposites is reduced from 0.05 wt % SWNT to 0.01 wt % with the addition of clay. SWNTs appear to have an affinity for clay that causes them to become more exfoliated and better networked in these composites. This clay-nanotube synergy may make these composites better suited for a variety of packaging, sensing, and shielding applications.