多壁碳纳米管/PCL-b-PNIPAM复合材料的制备

通过对多壁碳纳米管（MWCNTs）表面修饰合成羟基化的MWCNTs，利用羟基化的MWCNTs催化己内酯开环聚合，接着与溴代异丁酰溴反应，合成MWCNTs接枝聚己内酯（PCL）的大分子引发剂，利用该大分子引发剂引发N-异丙基丙烯酰胺单体进行原子转移自由基活性聚合（ATRP），成功制备了MWCNTs/PCL-b-PNIPAM复合材料。利用FTIR、TGA、XRD、NMR及TEM对产物进行表征。考察了MWCNTs/PCL-b-PNIPAM复合材料的结晶性能及在氯仿中的溶混性。XRD结果表明:MWCNTs/PCL-b-PNIPAM复合材料的结晶峰与PCL-b-PNIPAM嵌段共聚物基本一致，并且MWCNTs/PCL-b-PNIPAM复合材料在氯仿溶液中有很好的混溶性。 

Preparation of multi-walled carbon nanotubes/PCL-b-PNIPAM composites

The hydroxylated multi-walled carbon tubes (MWCNTs) was synthesized by surface-modification of MWCNTs. The MWCNTs grafted poly (caprolactone) (PCL) based macroinitiator was obtained by the ring opening polymerization of caprolactone which was catalyzed by MWCNTs-OH and further treated with 2-bromoisobutyryl bromide. The MWCNTs/PCL-b-PNIPAM composite was prepared by in situ atom transfer radical polymerization (ATRP). The products were characterized by FTIR, TGA, XRD, NMR and TEM. The crystallization property and miscibility of MWCNTs/PCL-b-PNIPAM composites in chloroform solvent were observed. The XRD results show that the crystallization peak of MWCNTs/PCL-b-PNIPAM composites is similar to the PCL-b-PNIPAM block copolymer, and MWCNTs/PCL-b-PNIPAM composites have a good miscibility in chloroform solution.