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    Anionic Polymerization of Styrene in Binary Mixtures of 1,2-Dimethoxyethane and Benzene
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (07), 1974) Takaya, K.; Ise, Norio
    The kinetics of living anionic polymerizations of styrene has been studied with lithium as gegenion in solution in binary mixtures of 1,2-dimethoxyethane and benzene at 0, 25 and 35°C. The contri bution of intermolecular triple ions is suggested from kinetic and conductivity data. The dissociation constant of the ion pairs increases as the temperature is lowered, while that of the triple ions decreases. Both the ion-pair and triple-ion dissociation constants increase as the dielectric constant is increased. The rate constants for the ion pairs, free ions and triple ions were determined. The triple ions are suggested to be of a solvent-separated intermolecular type and to be much more reactive than the free ions. No effect of electric field on the kinetics was observed in this system.
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    Thermal Conductivities of Ethene and its Fluorocarbon Analogues and of their Binary Mixtures with Argon
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Gray, Peter; Parkinson, Christopher
    The thermal conductivities of the five pure gases CH2CH2, CHFCH2, CF2CH2, CF2CHF and CF2CF2 together with their binary mixtures with argon, have been measured at both 50 and 100°C. At 50°C, negative deviations below the molar average value occur in the conductivity against composition curves for all five systems, and minima or signs of minima at intermediate compositions develop in the mixtures of CF2CH2, CF2CHF and CF2CF2 with argon. At 100°C, the latter three systems again show negative deviations, and minima are once more displayed by the mixtures of CF2CHF and CF2CF2 with argon. The system CHFCH2 plus argon exhibits evidence for a point of inflexion in the curve. This is the first time that minima have been observed in binary mixtures of a polar and a monatomic gas, though minima have been found with non-polar mixtures. Where minima develop, the formal condition AijAji[gt-or-equal]λj/λi is fulfilled, where Aij and Aji are coefficients of the Sutherland–Wassil-jewa equation, subscript i denoting the component with the lower thermal conductivity. The predictions of the empirical equation of Lindsay and Bronley are compared with experiment: the agreement is markedly less good than normally found, discrepancies being greatest in mixtures containing the most polar constituents. Outline comparisons with the Hirschfelder–Eucken approximation to rigorous theory are satisfactory.