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    尚旭, 景希玮, 徐健, 郑柏存, 公维光. 不同分子量聚乙烯吡咯烷酮对多壁碳纳米管分散性能的影响[J]. 华东理工大学学报(自然科学版), 2019, 45(6): 883-890. DOI: 10.14135/j.cnki.1006-3080.20180820002
    引用本文: 尚旭, 景希玮, 徐健, 郑柏存, 公维光. 不同分子量聚乙烯吡咯烷酮对多壁碳纳米管分散性能的影响[J]. 华东理工大学学报(自然科学版), 2019, 45(6): 883-890. DOI: 10.14135/j.cnki.1006-3080.20180820002
    SHANG Xu, JING Xiwei, XU Jian, ZHENG Baicun, GONG Weiguang. Influence of Polyvinylpyrrolidone with Different Molecular Weights on the Dispersion of Multiwalled Carbon Nanotubes[J]. Journal of East China University of Science and Technology, 2019, 45(6): 883-890. DOI: 10.14135/j.cnki.1006-3080.20180820002
    Citation: SHANG Xu, JING Xiwei, XU Jian, ZHENG Baicun, GONG Weiguang. Influence of Polyvinylpyrrolidone with Different Molecular Weights on the Dispersion of Multiwalled Carbon Nanotubes[J]. Journal of East China University of Science and Technology, 2019, 45(6): 883-890. DOI: 10.14135/j.cnki.1006-3080.20180820002

    不同分子量聚乙烯吡咯烷酮对多壁碳纳米管分散性能的影响

    Influence of Polyvinylpyrrolidone with Different Molecular Weights on the Dispersion of Multiwalled Carbon Nanotubes

    • 摘要: 研究了不同分子量的聚乙烯吡咯烷酮(PVP)对多壁碳纳米管(MWCNTs)浆料流变性能、稳定性能的影响,并对PVP修饰的MWCNTs(P-MWCNTs)导电性进行了分析。结果表明,中等分子量的PVPK25和PVPK30对浆料的分散效果最佳,浆料黏度较低,呈现近牛顿流体特征,分散的MWCNTs颗粒均匀,平均粒径相对较小,并具有较好的稳定性,同时P-MWCNTs电阻率也较低。通过拉曼光谱(Raman)、热失重(TG)、扫描电子显微镜(SEM)对作用机理分析,结果表明,PVPK25和PVPK30与MWCNTs之间有更强的π-π共轭作用,吸附量高于低分子量PVPK17和高分子量PVPK90的吸附量,并在MWCNTs表面具有更好的空间位阻修饰效果,因而使得MWCNTs几乎呈单根分散,缠结现象显著减少。

       

      Abstract: The influences of PVP with different molecular weights on the rheological properties and stability of multi-walled carbon nanotubes (MWCNTs) slurry and the electrical conductivity of modified MWCNTs (P-MWCNTs) were systemically investigated with the aim of elucidating the governing dispersing mechanism. The results showed that the PVP with medium molecular weights (PVPK25 and PVPK30) made the MWCNTs disperse uniformly, and the MWCNTs particle size was about 190 nm. As a result, the MWCNTs slurry showed lower viscosity and better stability, which led the slurry to evolving from shear-thinning fluid to nearly Newtonian fluid. Moreover, the P-MWCNTs modified by PVPK25 and PVPK30 also displayed lower electrical conductivity, to be 1/100 of the original carbon nanotube. The mechanism of adsorption of PVP on MWCNTs was investigated by Raman, TG and SEM. It was found that the wave number migration of the G peak was about 10 cm−1, and the 2D was about 5 cm−1, indicating that PVP with medium molecular weights had stronger π-π interaction with MWCNTs. The adsorption amounts of PVPK25 and PVPK30 were higher than those of low molecular weights (PVPK17) and high molecular weights (PVPK90) which can generate stronger steric hindrance repulsive force. SEM results directly indicated that the MWCNTs modified by PVPK30 and PVPK25 were dispersed homogenously, while some MWCNTs aggregates were observed for the samples modified by PVPK17 and PVPK90. The dispersion of MWCNTs was ascribed to the π-π interaction and the adsorption amount, leading to that the PVP with moderate molecular weights presented the best dispersibility. This study can not only understand the influences of PVP molecular weights on the dispersion behavior of carbon nanotubes, but also provide guidance for preparing conductive slurry composed of carbon nanotube.

       

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