NaH-assisted n-doping of polyanilines with dopant cation trapping sites and their stability of n-doping state against air. (2nd September 2015)

• Record Type: Journal Article
• Authors: Yamaguchi, Isao; Nagano, Tomoyuki; Tuan, Le Van
• Is Part Of: Polymer. Volume 73(2015)
• Page Start: 79
• Page End: 85
• Publication Date: 2015-09-02
• Subjects: Polyanilines -- n-Doping -- Bipolaron band -- Crown ether -- Electrical conductivity; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2015.07.037
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Polyanilines comprising aniline rings with and without a benzo-15-crown 5-ether (benzo15C5) subunit were synthesized by polycondensation initiated by ammonium persulfate. The treatment of the polymers with NaH caused deprotonation of the NH groups to yield n-doped polyanions. UV–vis spectra of the polyanions exhibited broad absorption above 700 nm corresponding to bipolaron bands. Because of n-dedoping of the polyanion, this absorption decreased gradually when the polyanion solution was exposed to air. UV–vis spectral changes suggest that the stability of the n-doping state of the polyanions increased as the content of the benzo15C5 subunit of the polymer increased. Cast films of the n-doped polymers with the benzo15C5 subunit underwent electrochemical oxidation (n-dedoping) at an unusually high potential; this factor responsible for the unusually high oxidation potential was the stabilized n-doping state that is attributed to the inclusion of Na + in the 15C5 ring. Polymers with the benzo15C5 subunit exhibited higher stability of the n-doping state in air than those without this subunit. Graphical abstract: Highlights: NaH-assisted n-doping of polyanilines with dopant cation trapping sites.