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The dynamic viscosities eta , the activation energies of the viscous flow E** eta //a and the mass densities rho were measured for the binary systems 12-crown-4/D//2O, 12-crown-4/ethylene glycol, 12-crown-4/methanol, 15-crown-5/D//2O, 15-crown-5/ethylene glycol, and 15-crown-5/methanol as a function of temperature T and mole fraction x//1 of the crown ether. – Mixtures with bifunctional ?alcohols? (D//2O, HOCH//2CH//2OH) showed ?broad maxima? in their isotherms eta (x//1, T equals const) and E** eta //a(x//1, T equals const), respectively. Correspondingly, the self-diffusion coefficients D//1 of the crown ethers in these mixtures pass a minimum. Quite different is the transport behavior of te crown ether/methanol system; it behaves with respect to eta and D//1 almost as ideal system. The results are discussed by assuming association in the systems, and such a model is also valid for dioxane/H//2O and dioxane/ethylene glycol mixtures.
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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare