Conducting polyaniline nanoparticle blends with extremely low percolation thresh

2019-05-15 13:32:55

poly HCl middot Percolation Polyvinyl

责任者: Banerjee, Pallab;Mandal, Broja M. 单位: Indian Assoc for the Cultivation of Science, Calcutta, India 来源出处: Macromolecules,1995,28(11):3940-3943 摘要: Blends of HCl-doped polyaniline (PANI·HCl) nanoparticles with the following conventional polymers, poly(vinyl chloride), polystyrene, poly(methyl methacrylate), poly(vinyl acetate), and poly(vinyl alcohol) (PVA), were prepared by suspending preformed submicronic PANI·HCl particles were prepared by oxidative dispersion polymerization using poly(vinyl methyl ether) (PVME) stabilizer. The particles contained 4.4 wt% PVME and had a conductivity of 4.96 S/cm. They had an oblong shape (250 nm × 190 nm). Sonication breaks the particles to size less than 20 nm. The blend films exhibit an extremely low percolation threshold (fp) in every case. The volume fraction of PANI·HCl at the percolation threshold for the above mentioned matrices lies in the range 2.5 × 10-4. Transmission electron microscopy of PANI·HCl-PVA blend films directly cast on carbon-coated TEM grids reveals connectivity at compositions close to fp. Self-assembly of the nanoparticles is evident from the TEM pictures. 关键词: Polymer blends;Aromatic polymers;Nanostructured materials;Polyvinyl chlorides;Polystyrenes;Polymethyl methacrylates;Polyvinyl acetates;Polyvinyl alcohols;Polymerization;Volume fraction;Transmission electron microscopy;Polyanilines;Low percolation thresholds;Polyvinyl acetate;Polyvinyl methyl ether;Oxidative dispersion polymerization;Sonication