Solid-state voltammetry and polymer electrolyte plasticization as a basis for an electrochemical gas chromatographic detector

Solvent swelling influences the electrochemical behavior and stability of thin films of nitrated poly (styrene)

“…Swelling due to incorporation of solvent and ionic or neutral ion aggregate species from the supporting electrolyte can influence the acti% ities of the redox groups in such films, thereby providing a possible origin for the non-Nernstian responses frequently seen in such systems (2,3). Swelling can also cause changes in the kinetics of redox processes by plasticizing the films (4) (which :an change the glass transition temperature, Tg, and, therefore, the collision fiequencies of the pendent redox groups), by changing the free volume and/or viscosity w.'hin the film, which can cause changes in the mobilities of incorporated species (4), and by changing the mean separation distance between the redox groups, and therefore, the efiiency of the eletm hopping processes by which charge propagates through such films (1,5). Thus, both the kinetic and thermodynamic processes which dictate the overall electrochemical behavior of thin polymer films can be profoundly influenced by changes in the state of swelling.…”

Electrochemical Measurements of Diffusion Coefficients of Redox-Labeled Poly(ethylene glycol) Dissolved in Poly(ethylene glycol) Melts

“…The diffusion coefficient measurements were normally reproducible to within ±10%, with stringent precautions at avoiding trace water and pumping away organic solvents both of which act to plasticize the polymer electrolyte and enhance the diffusion values. 16 Diffusion Coefficient Results. Table 1 gives results for diffusion coefficients (D) of the two ferrocene-labeled MPEG's (Fc 750 and Fc 1900) over a range of temperatures, host PEG MW, and electrolyte concentrations (which are stated as the ratio of polymer ether oxygens to dissolved LÍCIO4 electrolyte).…”

Performance specifications for technology development: Application for characterization of volatile organic compounds in the environment

“…Responses to methanol, ethanol, acetone, ether, and toluene were rapid (40-60 s) and reversible at 25°C. Parcher et al (1989) used a conducting polymer film to fabricate an electrochemical gas chromatographic detector.…”