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Calibration of vapor pressure osmometers for molecular weight measurement
Author(s) -
Burge David E.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070240126
Subject(s) - osmometer , vapor pressure osmometry , vapor pressure , molecular mass , thermistor , calibration , diffusion , chemistry , analytical chemistry (journal) , chromatography , vapor phase , atmospheric pressure , thermodynamics , materials science , organic chemistry , oceanography , statistics , physics , mathematics , geology , electrical engineering , enzyme , engineering
Experimental molecular weights in the range 200 to 100,000 Daltons have been determined by vapor pressure osmometry using three different solvents. For all values in excess of 10,000, molecular weights were also determined by membrane osmometry. The general agreement found for molecular weights determined under a variety of conditions, leads to the conclusion that values as high as 100,000 Daltons can be determined by at least one type of vapor pressure osmometer when it is calibrated with a material of 200 Daltons. Thermistor self‐heating and diffusion in the liquid phase are shown to be unimportant for this particular instrument.