论文部分内容阅读
利用聚电解质对多壁碳纳米管(MWNT)的表面进行修饰,能有效改善碳纳米管在溶剂中的分散性.首先将经硝酸氧化的碳纳米管与二甲亚砜和乙二醇反应,得到羟基修饰的碳纳米管.然后利用羟基与α-溴异丁酰溴(或α-氯丙酰氯)的酯化反应,在碳纳米管的表面引入了原子转移自由基聚合(atom transfer radical polymerization,ATRP)引发基团,引发丙烯酸叔丁酯(tBA)或4-乙烯基吡啶(4VP)聚合,通过投料比的改变,得到接入量不同的聚合物修饰的碳纳米管.利用热重分析(TGA)和红外对聚合物修饰的碳纳米管进行表征.将聚合物修饰的碳纳米管进行水解(或季胺化),制备得到在水溶液中良好分散的聚电解质修饰的碳纳米管.
Modification of the surface of multiwalled carbon nanotubes (MWNTs) with polyelectrolyte can effectively improve the dispersibility of carbon nanotubes in the solvent.Firstly, the nitric acid oxidized carbon nanotubes were reacted with dimethyl sulfoxide and ethylene glycol, To obtain hydroxy-modified carbon nanotubes.And then using the esterification of hydroxyl and α-bromoisobutyryl bromide (or α-chloropropionyl chloride), atom transfer radical polymerization (atom transfer radical polymerization , ATRP) initiator, initiating the polymerization of tert-butyl acrylate (tBA) or 4-vinylpyridine (4VP), and the polymer modified carbon nanotubes with different loadings were obtained by the change of the feed ratio. (TGA) and infrared (IR) were used to characterize polymer-modified carbon nanotubes.The polymer-modified carbon nanotubes were hydrolyzed (or quaternized) to prepare polyelectrolyte-modified carbon nanotubes well dispersed in aqueous solution.