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Type: Artigo de periódico
Title: Molecular weight of polyethylene glycols by vapor pressure osmometry: An alternative data treatment
Author: Sabadini, E
Assano, EM
Atvars, TDZ
Abstract: 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 Delta 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 Delta 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. (C) 1997 John Wiley & Sons, Inc.
Subject: polyethylene glycols
vapor pressure osmometry
molecular weight
data treatment
Editor: John Wiley & Sons Inc
Rights: fechado
Identifier DOI: 10.1002/(SICI)1097-4628(19970718)65:3<595
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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