物理化学学报 >> 1992, Vol. 8 >> Issue (06): 742-748.doi: 10.3866/PKU.WHXB19920606

研究论文 上一篇    下一篇

氨基酸在甲醇-水混合溶剂中粘度的研究

刘文彬; 王键吉; 王彩兰; 卢锦梭   

  1. 河南师范大学化学系,新乡 453002
  • 收稿日期:1991-06-20 修回日期:1991-12-16 发布日期:1992-12-15
  • 通讯作者: 刘文彬

Viscosity of Amino Acids in Methanol-Water Mixtures

Liu Wen-Bin; Wang Jian-Ji; Wang Cai-Lan; Lu Jin-Suo   

  1. Department of Chemistry, Henan Normal University, Xinxiang 453002
  • Received:1991-06-20 Revised:1991-12-16 Published:1992-12-15
  • Contact: Liu Wen-Bin

摘要: 报导了在293.15及298.15 K下, 氨基乙酸和DL-氨基丙酸在甲醇-水混合溶剂中的密度及粘度数据; 计算了在无限稀释条件下, 这些体系中氨基酸的粘度B系数及偏摩尔体积。实验结果表明: 在甲醇-水的质量比值(W_B)分别约为0.15及0.25处, 两种氨基酸的B系数均出现极小值。讨论了氨基酸的引入对溶剂结构的影响; 并应用流动过渡状态理论计算了两种氨基酸在甲醇水溶液中的流动活化参数。

关键词: 粘度β系数, 溶剂化, 偏摩尔体积, 活化参数

Abstract: Viscosities and densities at 293.15 and 298.15 K are reported in this paper for glycine and DL-alanine in methanol-water mixed solvent. The viscosity B coefficients and partial molar volumes at infinite dilution have been calculated. The experimental results show that B coefficients reach a minimum at about 15% for glycine and 25% for DL-alanine respectively. The effect of amino acids on solvent structure has been discussed. Also, the activation parameters for viscous flow for amino acids in methanol-water mixtures have been calculated.

Key words: Viscosity β coefficient, Solvation, Prtial molar volume, Activation parameter