Thermal and Electrical Conductivities of the Graphitized Carbon Nanotube/poly (methyl methacrylate) Composites Based on Weak Nanotube-polymer Interactions
Thermal and Electrical Conductivities of the Graphitized Carbon Nanotube/poly (methyl methacrylate) Composites Based on Weak Nanotube-polymer Interactions
复制标题
基于弱纳米管-聚合物相互作用的石墨化碳纳米管/聚甲基丙烯酸甲酯复合材料的导热性和导电性
DOI：
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发表时间：
2010
影响因子：
1
通讯作者：
Liu Chang
中科院分区：
文献类型：
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作者：
Liu Peng-Fei;Zeng You;Du Jin-Hong;Zhao Long;Liu Chang
由于碳纳米管的高表面能，碳纳米管（CNT）/聚合物复合材料的电导率和热导率受到碳纳米管周围聚合物包裹的极大阻碍。基于表面物理化学和润湿热力学研究了石墨化多壁碳纳米管填充的聚甲基丙烯酸甲酯（PMMA）。测量石墨化 CNT/PMMA 复合材料的电导率和导热率，以评估石墨化 CNT 的增强效果。石墨化CNT/PMMA复合材料表现出高导电率和0.8%（质量分数）的低渗流阈值，与纯PMMA相比，3%（质量分数）复合材料的导热率提高了193%，这是由于石墨化CNT的集成微观结构、弱的CNT-PMMA相互作用、CNT之间的低接触电阻以及高效的导电CNT网络。我们建议，可以通过充分考虑组件的表面能和填料-聚合物相互作用来设计和制造高性能复合材料。
Electrical and thermal conductivities of carbon nanotube (CNT)/polymer composites are greatly hindered by polymer-wrapping around CNTs due to high surface energy of CNTs. The graphitized multi-walled CNTs filled poly(methyl methacrylate) (PMMA) were investigated on the basis of surface physical chemistry and wetting thermodynamics. The electrical and thermal conductivities of the graphitized CNT/PMMA composites were measured to evaluate enhancing affects of the graphitized CNTs. The graphitized CNT/PMMA composites exhibit high electrical conductivity and a low percolation threshold of is 0.8% (mass fraction), and the thermal conductivity of the composites with 3% (mass fraction) increases by 193% in comparison with that of the neat PMMA, which is due to the integrated microstructures of the graphitized CNTs, weak CNT-PMMA interactions, low contact resistance between CNTs, and efficient conducting CNT-networks. We suggest that high-performance composites can be designed and fabricated by fully considering the surface energy of components and the filler-polymer interactions.