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Molecular weight of polyethylene glycols by vapor pressure osmometry: An alternative data treatment
Author(s) -
Sabadini E.,
Assano E.M.,
Atvars T.D.Z.
Publication year - 1997
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/(sici)1097-4628(19970718)65:3<595::aid-app19>3.0.co;2-w
Subject(s) - osmometer , vapor pressure osmometry , polyethylene , polymer , chemistry , vapor pressure , calibration curve , molar mass distribution , molecular mass , calibration , thermodynamics , analytical chemistry (journal) , polymer chemistry , chromatography , organic chemistry , mathematics , statistics , physics , detection limit , enzyme
In this work, we determined the number average molecular weight of some polyethylene glycols (PEGs) using vapor pressure osmometry. In general, this technique works with a plot of Δ r p / c p versus c p (concentration) and the molecular weight is determined by the calibration constant obtained from the curve intercept. We demonstrated that this method induces a high dispersion of the data, which can be minimized using a plot of Δ r p versus c p . Therefore, more precise values of molecular weight can be obtained and the number average molecular weight, M n , of several PEGs is directly determined from the ratio between the curve slopes obtained for a standard and the polymer sample. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:595–600, 1997