No abstract

Direct electropolymerization of a family of aromatic amines yields novel, stable conducting polymers with good conductivity and ca. 8 weight/weight percent (0.3M) or higher solubility in doped and undoped states in organic media. The polymers are electroactive in solution and recastable as films with spectroelectrochemical and electrochemical activity identical to virgin films. Detailed properties are reported in the present communication for two of the polymers, poly(N,N′‐diphenyl benzidine) and poly(benzidine), including solution electrochemistry, film properties of virgin vs. recast films, spectroelectrochemical properties which show broad‐band absorption across the visible spectral region and clear development of bipolaron bands, and charging capacities. Chronocoulometry, chronoamperometry, and chronovoltabsorptometry (optical transmission at specific wavelength as function of time and applied potential) show reversible behavior for films of poly(N,N′‐diphenyl benzidine) over several thousand cycles for pulses as short as 0.1 s, but polymer degradation on extended cycling for poly(benzidine). Polymer structural elucidation indicates a combination of N‐ andpara‐linkages for poly(N,N′‐diphenyl benzidine).

No abstract

A low-cost technique for fabricating large-area electrochromic coatings is described. Polyaniline was incorporated into polyacrylate-silica hybrid sol-gel networks using suspended particles or solutions. A solution of polyaniline and poly[methyl methacrylate-co-3-(trimethoxysilyl)propyl methacrylatel can be spray-or brush-coated on transparent indium-tin oxide substrates to form robust electrochromic coatings. Silane functional groups on the polyacrylate chain act as coupling and cross-linking agents to improve surface adhesion and mechanical properties of the resulting composite coatings. These coatings showed reversible transparent to green color change when polarized at potentials between -0.4 and +0.4 V vs. Ag/AgCl in a 0.2 M LiC1O4/acetonitrile electrolyte solution. The cycle lifetimes of polyaniline films were improved by incorporating the polymer in the polyacrylate-silica matrix. Electrochromic switching was demonstrated for the composite coatings in large-area all-solid-state devices. CF43 -CH2---C--H20.-ROK COO(C)3S(OH)3 CH3 CH_ 0 C00(CH2)1 -S-O--Si-0-) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-06-08 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-06-08 to IP

No abstract