摘要
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.
Surface modification of multiwalled carbon nanotubes （MWNT） by polyelectrolyte can enhance the dispersibility of carbon nanotubes in various solvents. Hydroxyl groups were firstly introduced onto the surface of carbon nanotubes （CNT） via esterification of glycol with MWNT which previously treated by concentrated HNO3 and then excess thionyl chloride. Initiating sites （MWNT-Br or MWNT-C1） for atom transfer radical polymerization （ATRP） were formed by reacting MWNT-OH with 2-bromoisobutyryl bromide or 2-chloropropionyl chloride. Grafting polymerization of poly（tert-butyl acry- late） （PtBA） or poly（4-vinylpyridine） （P4VP） from MWNT-Br or MWNT-C1 was carried out by surface-initiated ATRP po- lymerization. The content of grafted polymer, determined by thermal gravimetric analysis （TGA）, was tuned through the feed ratio of monomer to the initiating-sites on MWNT. After hydrolysis （or quaternary amination） of the polymers, different types of polyeleetrolyte-functionalized MWNT with good dispersibility in water were prepared successfully. All the materials were well characterized by TGA and infer-red spectrum （IR）.
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2012年第5期889-895,共7页
Chinese Journal of Organic Chemistry
基金
上海市科委纳米专项(No.1052nm03702)资助项目~~
