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|Type:||Artigo de periódico|
|Title:||Molecular weight of polyethylene glycols by vapor pressure osmometry: An alternative data treatment|
|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.|
vapor pressure osmometry
|Editor:||John Wiley & Sons Inc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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