PVPy/MWNTs纳米复合材料的制备及其导电性能研究

通过原位聚合法制备了聚3-戊酰基吡咯(PVPy)/多壁碳纳米管(MWNTs)纳米复合材料。利用FT-IR,1 HNMR,XRD,SEM,TEM,TGA等分析方法对样品进行了结构和性能研究。FT-IR,SEM与TEM表明,PVPy与MWNTs间并没有发生化学反应,MWNTs仅作为3-戊酰基吡咯(VPy)聚合的模板,且VPy仅在MWNTs的外表面均匀的发生聚合。XRD谱显示,PVPy/MWNTs纳米复合材料中MWNTs的两个特征结晶峰(2θ=25.82,43.10°)强度随着VPy/MWNTs投料比增加而逐渐降低直至接近消失。导电性能研究发现,通过MWNTs与PVPy复合,可以显著的提高PVPy/MWNTs纳米复合材料的导电性,其电导率分别达到1.42S/cm(VPy/MWNTs=2.5/1)与0.22S/cm(VPy/MWNTs=5/1)。

Preparation and Electrical Properties of PVPy/MWNTs Nanocomposites

Conducting poly(3-valerylpyrrole)(PVPy)/multi-wall carbon nanotubes(MWNTs) nanocomposites have been prepared by in-situ polymerization of 3-valerylpyrrole(VPy) on MWNTs.The structure and properties of the resulting samples are studied by FT-IR,1H NMR,XRD,SEM,TEM and TGA.FT-IR,SEM and TEM indicate that no chemical reaction occurred between PVPy and MWNTs,and only the MWNTs serve as a template for VPy polymerization.PVPy is only coated on the external surface of MWNTs and the thickness of the PVPy coating on each nanotube depends on the feed ratio of VPy to MWNTs.XRD patterns of the nanocomposites are investigated,it is clear that the intensity of the peaks at around 25.82° and 43.10° decreases with the increase of the mass ratio of VPy to MWNTs.Furthermore,the electrical conductivity of the samples is measured at room temperature,and the results exhibit that MWNTs can enhance the conductivity of PVPy/MWNTs nanocomposites compared to PVPy.The conductivity of PVPy/MWNTs nanocomposites is 1.42S/cm(VPy/MWNTs=2.5/1) and 0.22S/cm(VPy/MWNTs=5/1),respectively.