Abstract:

Multiwalled carbon nanotubes were treated with mixed acids to produce carboxyl groups  and then functionalized with hyperbranched macromolecules through “grafting from” and “grafting to” methods. The functionalized carbon nanotubes were characterized by SEM，FTIR，TGA-DSC，XRD and acid-base titration. Results showed that the hydroxyl group densities on the surface of carbon nanotubes obtained from the “grafting from” and “grafting to” methods are 24.74 mmol/g and 20.04 mmol/g respectively. The hyperbranched poly（amine-ester）modified carbon nanotubes showed a significantly improved dispersion. The modified carbon nanotubes provided a convenience for further functionalization and application.

摘要：

采用混酸氧化，使碳纳米管表面产生羧基，再分别以接出法（grafting from）的方式在碳纳米管表面“长出”超支化大分子；以接入法（grafting to）的方式将由“一步法”合成的超支化聚（胺-酯）通过酯化反应接枝到碳纳米管表面。通过SEM、FTIR、TGA-DSC以及XRD等表征手段并结合酸碱滴定法测定修饰后碳纳米管表面的羟基密度，对功能化修饰的碳纳米管进行分析。结果表明，分别以“grafting from”和“grafting to”方式接枝超支化聚（胺-酯）后，碳纳米管的羟基密度分别为24.74 mmol/g和20.04 mmol/g，修饰后的碳纳米管分散性能明显提高，同时末端丰富的官能团为碳纳米管的进一步功能化修饰创造了条件。