脂肪醇与二甲基亚砜的摩尔过量体积

EXCESS MOLAR VOLUMES OF AN ALKANOL WITH DMSO

在298.15K 和常压下,首次系统地测定了 C_1-C_4脂肪醇溶于偶极非质子性溶剂二甲基亚砜(DMSO)的溶液密度;计算了有关二元混合物的摩尔过量体积。结果表明,四种丁醇和异丙醇的 V^E 值在全浓度范围内均为正值;正丙醇、乙醇的V^E-X_(DMSO)曲线呈 S 形状;甲醇的 V^E 值在全浓度范围内均为负值.根据分子间的相互作用对结果进行了定性讨论。

The densities of an alkanol (C_1-C_4) with the dipolar aprotic solvent dimethyl sulfoxide (DMSO) were firstly measured at 298.15K and atmosphere pressure.Excess molar volumes,V^E,of binary mixtures were calculated.The results indicate:the V^E values are posi- tive for the mixtures of the butanol or iso-propanol and negative for methanol over the entire range of x_(DMSO);the curve of V^E against x_(DMSO) presents S-shaped for the mixtures of ethanol or n-propanol.The results are quilitatively discussed in terms of the molecular interactions.