Volume changes on mixing perfluoroalkanes with alkanes or ethers at 298.15 K

摘要: Abstract Excess molar volumes VE at 298.15 K have been determined by means of a vibrating-tube densimeter for binary mixtures n-hexane with perfluoroalkane, C5–C8, and perfluorohexane n-alkane, or an ether (diethyl, dipropyl, dibutyl, butyl methyl, ethyl ether). The systems perfluoropentane+hexane, perfluorohexane+pentane hexane diethyl investigated in the entire mole fraction range, while other only miscibility regions. observed values are positive (up to 5.5 cm3 mol−1) among largest known non-electrolyte systems. Limiting partial volumes, V ° , evaluated each component examined mixtures. behaviour has discussed terms scaled particle theory (SPT) simple group additivity scheme based on surface interactions. An estimate made average separation distance solvent from solute molecules.