不同代数聚酰胺-胺/多壁碳纳米管复合物制备及表征

Preparation and characterization of different algebra polyamidoamine/multi-walled carbon nanotube composites

目的:利用不同代数的聚酰胺-胺(PAMAM)制备分散性良好的多壁碳纳米管/聚酰胺-胺(MWCNTs-PAMAM)。方法:通过酰胺化法,将G3.0、G4.0代PAMAM共价修饰到MWCNTs上,制备MWCNTs-PAMAM复合物,采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱(Raman)、傅立叶红外光谱仪(FTIR)、Zeta电位、紫外分光光度法(UV)等方法对其表征。结果:通过SEM、TEM和UV显示,经不同代数PAMAM修饰MWCNTs-COOH后,其分散性顺序为MWCNTs-PAMAM(G4.0纯化)>MWCNTs-PAMAM(G3.0纯化)>MWCNTs-COOH;RP-HPLC和TGA表明,透析法除去了PAMAM(G3.0,G4.0)中部分小分子,其结构未发生变化,透析法对PAMAM G3.0纯化的效果较好;FTIR、Ramam、Zeta和TGA图中证明PAMAM共价接枝到了碳纳米管表面,且接枝率大小关系为MWCNTs-PAMAM(G3.0)<MWCNTs-PAMAM(G4.0)<MWCNTs-PAMAM(G3.0纯化)<MWCNTs-PAMAM(G4.0纯化)。结论:MWCNTs-PAMAM(G3.0)、MWCNTs-PAMAM(G4.0)具有良好分散性,为MWCNTs作为生物大分子的载体奠定了一定的基础。

OBJECTIVE To prepare multi-walled carbon nanotubes/polyamide-amine （MWCNTs-PAMAM） with good dis- persion with different algebraic polyamidoamine （PAMAM）. METItOI）S MWCNTs-PAMAM complexes were prepared by u- sing amidation method, generations of G3.0 and G4. 0 of PAMAM were used to covalently modify MWCNTs. Complexes were characterized by using scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, Raman spectroscopy （Raman）, Fourier transform infrared spectroscopy （FTIR）, zeta potential, ultraviolet spectrophotometry （UV） and other methods. RESULTS By SEM, TEM and UV, these complexes showed their dispersion orders： MWCNTs-PAMAM （purifica- tion of G4. 0）~ MWCNTs-PAMAM （purification of G3.0）~ MWCNTs-COOH; dialysis removed parts of small molecules from PAMAM （G3.0, G4. 0） by RP-HPLC and TGA, with structure not changed. Dialysis had better effects for purifying PAMAM G3.0. FTIR, Ramam, Zeta and TGA confirmed that PAMAM was covalently grafted onto the surface of carbon nanotubes, and the orders of graft rate were MWCNTs-PAMAM （G3. 0）〈MWCNTs-PAMAM （G4. 0）%MWCNTs-PAMAM （G3.0 purification）〈MWCNTs- PAMAM （G4. 0 purification）. CONCLUSION MWCNTs-PAMAM （G3. 0） and MWCNTs- PAMAM （G4. 0） have good dispersion, and lay a foundation for MWCNTs as a carrier of biological macromolecules.