Electrical Property of Carbon Nanotubes/Epoxy Resin/Polyetherimide Composites with Inverted-Phase Structure
Electrical Property of Carbon Nanotubes/Epoxy Resin/Polyetherimide Composites with Inverted-Phase Structure
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DOI：
10.4028/www.scientific.net/amr.652-654.56
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
D. Xi;Chuanguo Ma;Ming Liu;R. Shi
中科院分区：
文献类型：
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作者：
D. Xi;Chuanguo Ma;Ming Liu;R. Shi
研究了碳纳米管（CNTs）在聚醚酰亚胺（PEI）/环氧树脂（EP）热塑性/热固性高分子复合材料中的选择性分散及其电性能。结果表明，在CNTs/EP/PEI复合材料中，在热力学控制下，CNTs优先分散在富PEI相中，形成了富PEI相连续、EP相分离的球形反相结构。这种微结构有助于在复合材料中实现0.3wt%的非常低的渗流阈值。当CNTs含量超过逾渗阈值时，复合材料的介电常数约为100，随着频率的增加，介电常数先略有下降，然后迅速下降到一个平台。
Carbon nanotubes (CNTs) selective dispersion and electrical properties of one kind of thermoplastic/thermosetting polymer composite consisting of polyetherimide (PEI) and epoxy resin (EP) were investigated. The results showed that, in the CNTs/EP/PEI composite, under control of thermodynamics, CNTs are preferably dispersed in PEI-rich phase, and an inverted phase structure is obtained with continuous PEI-rich phase and separated EP phase as globular shapes. And this microstructure helps to achieve a very low percolation threshold of 0.3wt% CNTs in the composite. The composites at CNTs contents over the percolation threshold, have a high dielectric constant of around 100, which first decreases slightly and the drop rapidly into a platform with increasing frequency from beginning.