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篇目详细内容 |
【篇名】 |
Preparation of conductive polypyrrole (PPy) composites under supercritical carbon dioxide conditions |
【刊名】 |
Frontiers of Chemistry in China |
【刊名缩写】 |
Front. Chem. China |
【ISSN】 |
1673-3495 |
【EISSN】 |
1673-3614 |
【DOI】 |
10.1007/s11458-007-0024-6 |
【出版社】 |
Higher Education Press and Springer-Verlag |
【出版年】 |
2007 |
【卷期】 |
2
卷2期 |
【页码】 |
118-122
页,共
5
页 |
【作者】 |
LI Gang;
LIAO Xia;
SUN Xinghua;
YU Jian;
HE Jiasong;
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【关键词】 |
supercritical carbon dioxide; polypyrrole; conductive composites |
【摘要】 |
Electrically conductive composites were prepared via the chemical oxidative polymerization of the pyrrole monomer in polystyrene (PS) and zinc neutralized sulfonated polystyrene (Zn-SPS) films under supercritical carbon dioxide (SC-CO2) conditions. The strong swelling effect of SC-CO2 made polypyrrole (PPy) particles not only form on the surface, but also become incorporated into the film, resulting in a homogeneous structure with a relatively higher conductivity. By comparison, the composite prepared in aqueous solutions shows a skin-core structure and a conductivity of 3 to 4 orders of magnitude lower than that of the former due to the diffusion-controlled process of the pyrrole monomer. The percolation thresholds of PS/PPy and Zn-SPS/PPy composites were 6.2% and 2.7% of the volume fraction of PPy, respectively, much lower than the theoretically predicted value of 16%. Moreover, the conductive composites prepared under SC-CO2 conditions showed higher thermal stability, especially in the high-temperature region. |
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