碳纳米管/聚苯胺复合材料的原位合成及其形成机理

THE PREPARATION OF CARBON NANOTUBE/POLYANILINE COMPOSITES BY IN-SITU POLYMERIZATION AND ITS FORMATION MECHANISM

用竖式炉流动法,以二茂铁为催化剂,硫为助催化剂,苯为碳源通过催化裂解反应在1100～1200℃制备了直线形多壁碳纳米管,碳纳米管外径为20～50nm,内径10～30nm,长度50～1000μm。在碳纳米管表面原位合成了聚苯胺,制备出碳纳米管/聚苯胺一维纳米复合材料,复合材料的直径为50～60nm。X射线衍射及热重分析表明,原位合成的聚苯胺的结晶程度和热稳定性较高,聚苯胺在碳纳米管表面以枝晶状生长,探讨了聚苯胺在碳纳米管表面的形成机理。

The multi-walled carbon nanotubes (MWNTs) were prepared with benzene as carbon source and ferrocene as catalyst by catalytic floating transition method at 1 100～1 200 ℃. The carbon nanotubes obtained are straight with diameter 20～50 nm, internal diameter 10～30 nm and length 50～1 000 μm. The carbon nanotubes encapsulated by polyaniline (PANI) of nanometer size have been synthesized by in-situ polymerization. Polyaniline were protonated by HCl. The interaction between PANI and MWNTS has been investigated and explained according to the results of FT-IR. Changes in the dimensions of the composites were measured using SEM and TEM. The results showed that the improvement of thermal stability and crystallinity of the composites have evaluated by using TGA and XRD.