High resolution NMR for the direct characterisation of complex polyoxyethylated alcohols (CiEj) mixtures

Autor:	Valérie Molinier, Nathalie Azaroual, Anne-Gaëlle Fournial, Gaston Vermeersch, Jean-Marie Aubry
Rok vydání:	2008
Předmět:	chemistry.chemical_classification chemistry.chemical_compound Colloid and Surface Chemistry High resolution nmr Chemistry Dispersity Moiety Organic chemistry Alcohol Length distribution Carbon-13 NMR Branching (polymer chemistry) Alkyl
Zdroj:	Colloids and Surfaces A: Physicochemical and Engineering Aspects. 331:16-24
ISSN:	0927-7757
DOI:	10.1016/j.colsurfa.2008.05.007
Popis:	High resolution 1 H and 13 C NMR were used to characterise complex mixtures of industrial polyoxyethylated surfactants of the C i E j series. A progressive methodology was applied to analyse mixtures of monodisperse surfactants of increasing complexity, with regard to both the alkyl chain ( i = 8–16) and the polyoxyethylene moiety ( j = 1–8). The techniques were then successfully applied for the characterisation of narrow- and broad-range commercial surfactants and to analyse the widely used Brij 30. It appears that direct high resolution NMR analysis of ethoxylated alcohol mixtures offers simultaneously a good description of the alkyl chain composition as regards to the length distribution and branching, together with an accurate overview of the oxyethylene oligomeric distribution for ethoxylates containing up to eight units. Finally NMR allows to check free alcohol and free polyethylene oxide that may exist in commercial surfactants.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::eb183787264974f6cf9eea269aa7bd6f https://doi.org/10.1016/j.colsurfa.2008.05.007 Zobrazit plný text záznamu Full Text from ScienceDirect