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采用硫酸和硝酸的混合液氧化多壁碳纳米管(MWCNTs),再用二氯亚砜将氧化产生的羧基酰氯化,进一步与带有活性端基的超支化聚酰胺(HBPA)反应,得到超支化聚酰胺修饰的碳纳米管。采用红外光谱(FT-IR)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电镜(TEM)及热重分析(TGA)对化学修饰的碳纳米管进行了表征。结果表明HBPA接枝到碳纳米管上,在碳纳米管表面形成聚合物层。由TGA曲线计算出改性碳纳米管的接枝率约为27%;SEM结果表明接枝后的碳纳米管在无水乙醇中的分散性更好。
Multi-walled carbon nanotubes (MWCNTs) were oxidized by a mixture of sulfuric acid and nitric acid, and then chlorinated by oxidizing the carboxyl groups with thionyl chloride to further react with hyperbranched polyamides (HBPA) Polyamide modified carbon nanotubes. The chemically modified carbon nanotubes were characterized by FT-IR, XPS, SEM, TEM and TGA. The results show that HBPA is grafted to the carbon nanotubes to form a polymer layer on the surface of the carbon nanotubes. The grafting degree of modified CNTs was estimated to be about 27% by TGA curve. SEM results showed that the grafted CNTs had better dispersion in absolute ethanol.