文献类型：期刊文献

英文题名：Preparation of conducting polyaniline and polyaniline- Fluorinated montmorillonite nanocomposites in supercritical carbon dioxide

作者：Sun, Fu[1,3]; Pan, Yuejin[2]; Wang, Jing[1,3]; Wang, Zi[1,3]; Hu, Chunpu[1,3]; Dong, Qingzhi[1,3]

机构：[1] School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China; [2] Shanghai Zhongda Technology Corporation, Shanghai 201702, China; [3] Key Laboratory for Ultrafine Materials, Ministry of Education, Shanghai 200237, China

年份：2008

卷号：46

期号：1

起止页码：37

外文期刊名：Journal of Macromolecular Science, Part A: Pure and Applied Chemistry

收录：EI(收录号：20085011779981)

语种：英文

外文关键词：Emulsion polymerization - Thermodynamic stability - Polyaniline - X ray diffraction - Emulsification - Paraffins - Scanning electron microscopy - Thermogravimetric analysis - Clay minerals - Carbon dioxide - Silicones - Transmission electron microscopy - Fourier transform infrared spectroscopy - Supercritical fluid extraction

摘要：A new polymerization procedure with the aid of reverse micelles in supercritical carbon dioxide (SCCO2) has been employed to synthesize polyaniline (PANI). Sodium bis(2-ethylhexyl)-sulfosuccinate (AOT) and polyether-modified polysiloxane (PeSi) were used as mixing surfactants. PANI with more favorable needle-like aggregation structure, higher crystallinity, more excellent conductivity (7.22 S cm- 1) and better dispersibility in ethanol has been obtained via the inverse emulsion polymerization in SCCO2, compared to the PANI synthesized in isooctane. These results were demonstrated by the analysis of Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), X-ray diffraction patterns (XRD) and conductivity measurement. The new polymerization procedure was also employed to prepare polyaniline-fluorinated montmorillonite (PANI-FMMT) nanocomposites in SCCO2. The nanocomposites with highly concentrated (12 wt%-50 wt% loading to monomer), fully delaminated FMMT were successfully prepared. The intercalation of FMMT in SCCO2 was characterized by FTIR, XRD, TEM. Thermogravimetry Analysis (TGA) was performed to investigate the enhancement of thermal stability of PANI-FMMT nanocomposites. SCCO2 facilitate the synthesis of PANI with high performance and PANI-MMT with high MMT concentration. SCCO2 is not only an "alternative" solvent for its environmental-friendly characteristic, but also a more "effective" medium compared to some organic solvent (such as isooctane) to prepare PANI and its intercalated composite materials.