高等学校化学学报

高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (7): 753.

• 研究论文 • 上一篇    下一篇

动态膜渗透压法测量中的气球效应和液体粘附效应

邵毓芳, 洪怀懋, 程镕时   

  1. 南京大学化学系
  • 收稿日期:1988-01-09 出版日期:1989-07-24 发布日期:1989-07-24
  • 通讯作者: 邵毓芳
  • 基金资助:

    中国科学院科学基金

Balloon and Liquid Adhesion Effect in Dynamic Membrane Osmometry Determination

Shao Yufang, Hong Huaimao, Cheng Rongshi   

  1. Department of Chemistry, Nanjing University, Nanjing
  • Received:1988-01-09 Online:1989-07-24 Published:1989-07-24

PDF (PC)

摘要： 用动态方法测量了半透膜对溶剂的透过速率及高聚物溶液的渗透压。膜在较大静压差的作用下所发生的弹性形变和液体在毛细管管壁上的粘附影响测量的复现性,导致了H～dH/dt关系偏离直线,使上升线与下降线不对称。

关键词: 动态渗透压法, 气球效应, 数均分子量

Abstract: The influences of the balloon effect, i.e.the elastic deformation of the semipermeable membrane and the adhesion of liquids on the capillary, wall, on the measurement of solvent permeation rate and osmotic pressure of polymer solution were investigated by dynamic method theoretically and experimentally.The balloon effect leads to the departure from linearity of the plot of permeation rate of solvent against the hydrbstatic pressure difference.This effect could be described quantitatively by a deformation factor which is closely related with swelling ratio of the membrane in the solvent.The adhesion of liquids on the capillary wall influences the reproducibility of measurements and is the main reason for the occurrence of the unsymmetry of ascending and descending lines.

Key words: Dynamic membrane osmometry, Balloon effect, Number-average molecular weight

TrendMD: