碳纳米管/PMMA/PVAc复合膜的微观结构研究

在不同工艺条件下制备了碳纳米管／聚甲基丙烯酸甲酯（PMMA）／聚醋酸乙烯酯（PVAc）复合膜，用透射电镜和扫描电镜详细研究了碳纳米管／PMMA／PVAc复合膜的微观结构，考察了碳纳米管在聚合物中的分散状态和导电网络的形成条件，发现通过超声分散和喷涂工艺制备的碳纳米管／PMMA／PVAc复合膜具有规则的导电网络，而且表面平整，是制备导电复合膜的最佳工艺；碳纳米管／PMMA／PVAc复合膜是很好的气敏候选材料。

STUDY ON MICROSTRUCTURE OF COMPOSITE FILM MADE OF CARBON NANOTUBES/PMMA/PVAc

Thin films made of poly(methyl methacrylate) (PMMA), poly(vinyl ac etate) (PVAc) and carbon nanotube composite were produced by different coating m ethod. The microstructure of these composite films was characterized by SEM and TEM in order to obtain information on the possible interactions between the thre e components in the composite materials, and especially on the dispersion of the nanotubes and organization. It has been found that the best way to produce the carbon nanotube/PMMA/PAVc composite film with conductive network is to disperse carbon nanotubes in PMMA and PAVc by ultrasonic and spraying coating. Compatibl e blends of poly(methyl methacrylate) and poly(vinyl acetate) would be a good ca ndidate to make a series of electrically conducting carbon nanotubes composites whose resistance is sensitive to the nature and concentration of an analyte in t he vapor phase.