Volumetric behavior of poly(α-L-lysine HBr) in aqueous alcohol solutions
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説明
Abstract Densities of solutions of poly(α-L-lysine HBr) ( pll HBr) in aqueous solutions of ethanol (EtOH), 1-propanol (1-PrOH), 2-propanol (2-PrOH), t-butanol (t-BuOH), and 1,2-ethanediol ( eg ) have been measured at 298.15 K using an oscillating-tube densimeter. The apparent molar volumes V2, π defined for the monomer of pll HBr, were found to be linearly dependent on the concentration with positive or negative slopes and were extrapolated to infinite dilution. Partial molar volumes of pll HBr at infinite dilution show a minimum for each solvent mixture at a certain mole fraction x of alcohol in the range 0.1 to 0.2. In aqueous 2-PrOH and t-BuOH, a second minimum and subsequent sharp increases of the volume were found at higher mole fractions of alcohol. These results are briefly discussed with reference to the hydration, dehydrative counter-ion binding, and helix formation of the polymer.
収録刊行物
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- The Journal of Chemical Thermodynamics
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The Journal of Chemical Thermodynamics 12 41-46, 1980-01-01
Elsevier BV
