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Determination of PEG concentration in its aqueous solution using differential scanning calorimetry
Author(s) -
Yamauchi T.,
Hasegawa A.
Publication year - 1993
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.1993.070490918
Subject(s) - differential scanning calorimetry , bound water , peg ratio , aqueous solution , ethylene glycol , chemistry , free water , thermodynamics , polymer chemistry , materials science , molecule , organic chemistry , physics , finance , environmental engineering , engineering , economics
The Freezing and melting behavior of aqueous poly(ethylene glycol) (PEG) solutions up to a concentration of 10% was examined using DSC. So long as the molecular weight of PEG is over 1000, the cooling and heating DSC curves have two peaks, which are attributed to freezable bound water and free water. The amounts of freezable bound water and nonfreezing water linearly increase with an increase of PEG concentration. Therefore, a method using DSC was proposed for determining the concentration of aqueous PEG solutions. Although PEG concentration can be determined by the heat of freezable bound water, the ratio of heat of freezable bound water to heat of free water is a better way to determine the concentration. © 1993 John Wiley & Sons, Inc.