Kinetics of filler wetting and dispersion in carbon nanotube/rubber composites
Kinetics of filler wetting and dispersion in carbon nanotube/rubber composites
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DOI：
10.1016/j.carbon.2012.05.039
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发表时间：
2012-10-01
期刊：
影响因子：
10.9
通讯作者：
Radusch, H. -J.
中科院分区：
文献类型：
--
作者：
Le, H. H.;Hoang, X. T.;Radusch, H. -J.
研究了离子液体1-丁基-3-甲基咪唑双(三氟甲基-磺酰亚胺)(BM！)对多壁碳纳米管(MWCNTs)的表面修饰效果。研究了氯丁橡胶(CR)复合材料中填料润湿和分散的动力学以及由此产生的电导率。使用了两种不同的多壁碳纳米管，贝氏管和纳米碳管，它们的结构、纯度和与CR和BMI的相容性不同。结果表明，BMI能显著改善Baytube的宏观分散性，使未硫化的BMI-Baytube/CR复合材料的电导率提高5个数量级。相反，BMI的使用减缓了BMI-Nanocyl/CR复合材料的分散过程和导电性的发展。我们的润湿概念被进一步发展用于量化碳纳米管表面的结合聚合物。我们发现，由于浓度补偿效应，在混合过程中碳纳米管表面键合的BMI被CR分子取代。在随后的固化过程中，碳纳米管的解聚和再团聚过程会显著增加或降低电导率。电导率变化的程度很大程度上取决于结合聚合物的组成和所使用的固化技术。(C)2012爱思唯尔有限公司。保留所有权利。
The effects of the surface modification of multi-walled carbon nanotubes (MWCNTs) by an ionic liquid, 1-butyl 3-methyl imidazolium bis(trifluoromethyl-sulphonyl)imide (BM!) on the kinetics of filler wetting and dispersion as well as resulting electrical conductivity of polychloroprene (CR) composites were studied. Two different MWCNTs were used, Baytubes and Nanocyl, which differ in their structure, purity and compatibility to CR and BMI. The results showed that BMI can significantly improve the macrodispersion of Baytubes, and increases the electrical conductivity of the uncured BMI-Baytube/CR composites up to five orders of magnitude. In contrast, the use of BMI slows the dispersion process and the development of conductivity of BMI-Nanocyl/CR composites. Our wetting concept was further developed for the quantification of the bound polymer on the CNT surface. We found that the bonded BMI on the CNT surface is replaced by the CR molecules during mixing as a result of the concentration compensation effect. The de- and re-agglomeration processes of CNTs taking place during the subsequent curing process can increase or decrease the electrical conductivity significantly. The extent of the conductivity changes is strongly determined by the composition of the bound polymer and the curing technique used. (C) 2012 Elsevier Ltd. All rights reserved.