嵌段共聚物修饰多壁碳纳米管

Modification of hydroxylated multi-walled carbon nanotubes with a block copolymer

摘要: 为了改善多壁碳纳米管的分散性，通过丙烯酸和羟基化多壁碳纳米管的酯化反应将双键引入到碳纳米管的表面，同时利用原子转移自由基聚合合成端基为卤素的苯乙烯-b-甲基丙烯酸羟乙酯嵌段共聚物，并通过对双键的加成反应，将嵌段共聚物引入到多壁碳纳米管的表面，实现了碳纳米管的化学修饰。通过FTIR、TGA和TEM技术对产物进行了表征，结果表明:嵌段共聚物通过共价键接枝到碳纳米管表面，其含量为42.9%，平均约277个碳原子接枝一条聚合物链；修饰后的MWCNTs在乙醇中分散良好。

Abstract: A novel approach was used to improve the dispersibility of multi-walled carbon nanotubes (MWCNTs) in a solvent. Vinyl-functionalized MWCNTs were prepared by the esterification of acrylic acid with hydroxylated MWCNTs. The block copolymer, polystyrene-b-hydroxyethyl methacrylate was synthesized by means of atom transfer radical polymerization. Then the block copolymer was attached to the surface of the MWCNTs through an addition reaction. The products were characterized by FTIR, TGA and TEM. Results indicated that the copolymer was attached to the surface of the MWCNTs by covalent bonds with a content of 42.9%, i.e. every 277 carbon atoms were grafted with a block copolymer chain. The resulting products had a good dispersibility in ethanol.