摘要
将碳纳米管用c(K2Cr2O7)=0.25 mol/L,c(H+)=1 mol/L混合溶液进行处理,制得表面含有活性羟基的碳纳米管。在催化剂的存在下,以CNTs为反应中心核,氧化处理后的CNTs表面上的活性羟基与A2B型单体发生一步缩聚反应,将超支化聚合物接到碳纳米管的表面上,实现了碳纳米管的表面修饰。探讨了反应条件对接枝在CNTs表面上的超支化聚合物(HPAE)量的影响,当反应温度为120℃,反应时间为10 h,反应配料比n(CNTs-OH)∶n(A2B单体)=1∶6时,固载量达到0.255。FTIR、XPS、TEM的表征结果证明,CNTs接枝上了超支化聚合物。透光度的测定和静置实验表明,超支化聚合物接枝改性CNTs在丙酮、乙醇、水等溶剂中具有很好的分散性能。
CNTs were first oxidized in a mixture of c（ K2Cr2O7 ） ： 0. 25 mol/L and an acid with c （H ＋）1 mol/L to obtain CNTs with hydroxyl groups on their surfaces, then the oxidized CNTs were = grafted with hyperbranched poly （amin-ester） through one-step polycondensation between A2 B monomer and active hydroxyl on CNTs surface in the presence of catalyst. The reaction conditions were studied and optimized with respect to the amount of HPAE coupled with CNTs. Under the conditions：n （CNTs-OH）：n （A2B monomer） = 1：6, reaction time = 10 h, reaction temperature 120℃, the amount of HPAE coupled with CNTs reached to 0. 255. From the resulis of FTIR, XPS and TEM, it can be found that hyperbranched poly（amin-ester） is successfully grafted onto poly （amin-ester） exhibit the surface of CNTs. The results indicate that CNTs grafted better dispersion in acetone, ethanol or water than unmodified with hyperbranched CNTs.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第11期1361-1365,共5页
Chinese Journal of Applied Chemistry
关键词
碳纳米管
超支化聚合物
分散性能
carbon nanotube, hyperbranched polymer, dispersion property
