摘要
采用水热法利用两亲性聚乙烯基吡咯烷酮(PVP)对CNTs进行了表面修饰,通过TGA、FT-IR、SEM、接触角分析研究了改性CNTs的表面性质和分散特性。实验结果表明:水热法较常用的常压法相比,可以提高CNTs的PVP包覆率,且使PVP同CNTs之间具有更强的作用力,同时使处理效率有较大提高;PVP用量、保温时间和PVP的分子量是影响PVP包覆率的主要因素;较纯CNTs相比,改性CNTs与水的亲和性有较大改善,在水中的分散性极大改善,同时在乙醇和丙酮中的分散性也显著改善。
Carbon nanotubes （CNTs） are very easy to aggregate. In order to improve the dispersion of CNTs in wa- ter or some solvents, CNTs were modified with amphiphilic polyvinylpyrrolidone （PVP） by a hydrothermal method. The surface characteristics and dispersion of the CNTs were investigated by thermogravimertic analysis （TGA）, fourier trans form infrared spectroscopy（FTIR）,scanning electron microscopy （SEM） and contact angle analysis. The results showed that hydrothermal method can increase the PVP coating percent of CNTs, and strengthened the interaction between PVP and CNTs, and had higher efficiency than the commonly used pressure methods. The dosage of PVP, holding time and molecular weight of PVP were the main factors affecting the coating percent. Compared with the pure CNTs, the modified CNTs had better compatibility with water, and their dispersion in water was greatly improved. In addition, the dispersions of the modified CNTs in ethanol and acetone were also significantly improved.
出处
《化工新型材料》
CAS
CSCD
北大核心
2011年第11期42-45,共4页
New Chemical Materials
基金
国家自然科学青年基金(50903022)
广西信息材料重点实验室研究基金(桂科能0710908-08-Z)
关键词
碳纳米管
聚乙烯基吡咯烷酮
水热法
表面修饰
carbon nanotube, polyvinylpyrrolidone,hydrothermal treatment, surface modification
