高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (6): 1263.

• 研究论文 • 上一篇    下一篇

基于弱相互作用的石墨化CNT/PMMA复合材料的热电传输性能

曾尤1, 赵龙1,2, 刘鹏飞1,2, 杜金红2, 刘畅2   

  1. 1. 沈阳建筑大学材料科学与工程学院, 沈阳 110168;
    2. 中国科学院金属研究所, 沈阳材料科学国家(联合)实验室, 沈阳 110016
  • 收稿日期:2009-09-15 出版日期:2010-06-10 发布日期:2010-06-10
  • 通讯作者: 曾尤, 男, 博士, 教授, 主要从事功能复合材料及智能材料的研究. E-mail: zengyou@sjzu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 90606008, 50703045)、辽宁省教育厅项目(批准号: 2008589)和辽宁省高校重点实验室开放基金资助.

Thermal and Electrical Conductivities of the Graphitized Carbon Nanotube/poly(methyl methacrylate) Composites Based on Weak Nanotube-polymer Interactions

ZENG You1*, ZHAO Long1,2, LIU Peng-Fei1,2, DU Jin-Hong2, LIU Chang2   

  1. 1. School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
    2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2009-09-15 Online:2010-06-10 Published:2010-06-10
  • Contact: ZENG You. E-mail: zengyou@sjzu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 90606008, 50703045)、辽宁省教育厅项目(批准号: 2008589)和辽宁省高校重点实验室开放基金资助.

摘要:

从理论上计算了碳纳米管(CNT)与聚甲基丙烯酸甲酯(PMMA)的相互作用及浸润性, 并测试了CNT/PMMA复合材料的电学、热学和光学性能. 发现石墨化CNT/PMMA复合材料具有较好的导热和导电性能, 其渗流阈值在0.8%左右, 当CNT质量分数为3%时, 复合材料的导热系数提高193%. 这种电学及热学性能的提高一方面与石墨化CNTs的规整结构有关, 另一方面与石墨化CNT-PMMA体系的弱相互作用、CNT间的有效接触以及高效的CNT网络输运性能有密切关系. 研究结果表明, 通过调控CNT与聚合物基体的表面性质、相互作用及浸润性, 可以有效地构建优化的CNT输运网络, 获得性能优异的功能复合材料.

关键词: 碳纳米管; 弱相互作用; 聚甲基丙烯酸甲酯; 复合材料; 热电传输性能

Abstract:

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 compo-sites were measured to evaluate enhancing effects 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.

Key words: Carbon nanotube; Weak interaction; Poly(methyl methacrylate); Composite; Thermal and electrical conductivity

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