title: Plasticizing effect of K+ ions and succinonitrile on electrical conductivity of [poly(ethylene oxide)-succinonitrile]/KI-I2 redox-couple solid polymer electrolyte.
abstract: The plasticizing effect of the K(+) ions and succinonitrile on the electrical conductivity of a new redox-couple solid polymer electrolyte system, (1 - x)[0.5poly(ethylene oxide):0.5succinonitrile]:x[0.9KI:0.1I2] with x = 0-0.2 in weight fraction, is reported. An increase of x resulted in an increase of the electrical conductivity (σ25°C) of the electrolyte. The electrolyte with x = 0.15 exhibited the highest σ25°C value, ~7 × 10(-4) S cm(-1), and is referred to as the optimum conducting composition (OCC). In addition to an increase of the mobile ion concentration with increasing x, X-ray diffractometry, Fourier-transform infrared spectroscopy, polarized optical microscopy, UV-vis spectroscopy, and differential scanning calorimetry studies revealed a decrease of poly(ethylene oxide) crystallinity/an increase of ionic mobility, indicating the plasticizing effect of the K(+) ions. Plasticizing and molecular diffusing properties of the succinonitrile further helped to improve the electrical conductivity of the electrolyte.
authors.affiliation: CRC, Department of Optometry College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia.
authors.forename: Ravindra Kumar
authors.initials: RK
authors.lastname: Gupta
authors.forename: Hee-Woo
authors.initials: HW
authors.lastname: Rhee
mesh_terms: D004553:Electric Conductivity; D004573:Electrolytes / Q000737:chemistry; D007455:Iodine / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D009570:Nitriles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011188:Potassium / Q000737:chemistry*; D011193:Potassium Iodide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D004573:Electrolytes; D007477:Ions; D009570:Nitriles; D011108:Polymers; D011193:Potassium Iodide; C010337:succinonitrile; D011092:Polyethylene Glycols; D007455:Iodine; D011188:Potassium