笼形聚倍半硅氧烷增强多壁碳纳米管在水溶液中的分散性研究
首发时间:2016-07-11
摘要:本研究以笼形聚倍半硅氧烷(POSS)为物理分散剂,利用POSS与多壁碳纳米管(MWNTs)间较强的相互作用,在水溶液中对MWNTs进行分散。采用紫外吸光度对POSS分散的MWNTs浓度和稳定性进行了表征,测定了分散液的Zeta电位和离心后上清液中固体物质的质量分数,并采用透射电镜观察了POSS与MWNTs间的结合状况。结果表明,POSS可以显著提高 MWNTs在水溶液中的分散性,但提高程度与其有机官能团R基的结构有关。在本研究所采用的五种POSS中,八异丁基笼形聚倍半硅氧烷(POSSC)的分散效果最好。在此基础上,优化得到POSSC分散MWNTs的最佳条件:MWNTs浓度为30 mg/L,POSSC和MWNTs的质量比为1。此时,POSS可较好地吸附在MWNTs表面对其进行分散,且MWNTs/POSS的水溶液具有良好的稳定性。该分散方法简单高效且不破坏MWNTs的完整结构,所得分散液可用于复合材料的制备。
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Studies on Dispersion of MWNTs in Aqueous Solution Assisted with Polyhedral Oligomeric Silsesquioxane
Abstract:Polyhedral Oligomeric Silsesquioxane (POSS) was used as a physical dispersant to disperse multiwalled carbon nanotubes (MWNTs) in aqueous solution based on their strong interactions. The dispersing concentration and stability of MWNTs dispersed by POSS were characterized by UV-vis absorbance. Zeta potential of aqueous dispersion and weight percentage of the surpernatant after centrifugation were measured, while transmission electron microscope (TEM) was used to observe the conjugation state of POSS and MWNTs. Results showed that dispersion capability and stability of MWNTs in aqueous solution were significantly improved by POSS, but the performance of POSS largely depended on the structure of R organic groups. Among the five kinds of POSS investigated in this study, octaisobutyl POSS (POSSC) presented the best dispersion effects on MWNTs. On this basis, conditions to disperse MWNTs with POSSC was optimized to be that MWNTs concentration was 30 mg/L and the weight ratio between POSS and MWNTs was 1. Using this facile, effective and nondestructive dispersion method, the obtained MWNTs/POSS dispersion can be used for nanocomposite construction.
Keywords: Multiwall carbon nanotube (MWNTs) polyhedral oligomeric silsesquioxane (POSS) dispersion stability
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笼形聚倍半硅氧烷增强多壁碳纳米管在水溶液中的分散性研究
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