高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

高填充量碳纳米管/丁苯粉末橡胶机械混炼的物理化学机制

周湘文1,2, 朱跃峰2, 熊国平2, 梁吉2, 于溯源1   

    1. 清华大学核能与新能源技术研究院,
    2. 先进成形制造教育部重点实验室, 北京 100084
  • 收稿日期:2008-08-18 修回日期:1900-01-01 出版日期:2009-03-10 发布日期:2009-03-10
  • 通讯作者: 周湘文

Physical and Chemical Mechanism of Mechanical Mixing of Powder Styrene-butadiene Rubber Composites Filled with High Contents of Carbon Nanotubes

ZHOU Xiang-Wen1,2*, ZHU Yue-Feng2, XIONG Guo-Ping2, LIANG Ji2, YU Su-Yuan1   

    1. Institute of Nuclear and New Energy Technology,
    2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
  • Received:2008-08-18 Revised:1900-01-01 Online:2009-03-10 Published:2009-03-10
  • Contact: ZHOU Xiang-Wen

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被引次数

12

摘要： 将用喷雾干燥法制备的碳纳米管(CNTs)/丁苯粉末橡胶复合材料在开炼机上机械混炼, 考察机械混炼对复合材料常规力学性能的影响, 并对机械混炼对CNTs增强丁苯橡胶复合材料力学性能的影响进行相应的理论研究和机理分析. 结果表明, 与混炼前的复合材料相比, 机械混炼有效地提高了CNTs/丁苯橡胶复合材料的力学性能, 特别是当CNTs加入量较大时, 提高幅度更为显著, 与填充传统补强剂CB复合材料相比, 具有较大的优势. 这是因为机械混炼一方面使CNTs在橡胶基体中获得了更为充分均匀的分散; 另一方面, 混炼过程中产生的自由基以及巨大的剪切力, 使得CNTs与橡胶基体间界面结合如物理吸附、氢键作用、化学结合等得到了进一步增强, 提高了CNTs/丁苯橡胶复合材料的结合橡胶含量, 更好地发挥了CNTs对丁苯橡胶的补强效应, 从而提高了复合材料的拉伸强度和撕裂强度等力学性能. CNTs补强丁苯橡胶复合材料力学性能的机理符合“强键和弱键学说”.

关键词: 碳纳米管, 丁苯橡胶, 力学性能, 喷雾干燥法, 机械混炼

Abstract: Carbon nanotubes(CNTs)/styrene-butadiene rubber(SBR) composite powders prepared by spray drying method was mechanically mixed with a two-roller open mixer. Influences of the mechanical mixing on the mechanical properties of the composites were investigated and the theoretical mechanism of such influences was analyzed. The results show that mechanical mixing effectively enhance the mechanical properties of CNTs/SBR composites particularly for those with high content of CNTs which are much better than those filled with the same content of carbon black. CNTs could be further dispersed homogeneously in the matrix through mechanical mixing. On the other hand, because of large shear force during the mixing process and the formed free functional groups, the interactions between CNTs and the rubber matrix such as physical absorption, hydrogen bonding and chemical bonding were improved that increased the combined rubber contents of the composites. Correspondingly CNTs could be more efficient in strengthening the SBR. Therefore the tensile and tear strengths of the composites were improved after the mechanical mixing. The strengthening effect of CNTs in SBR probably accorded with the “strong and weak bonding” mechanism.

Key words: Carbon nanotube, Styrene-butadiene rubber, Mechanical property, Spray drying method, Mechanical mixing

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