title: Liquid chromatography at the critical conditions in pure eluent: an efficient tool for the characterization of functional polystyrenes.
abstract: Functional polymers are usually separated by liquid chromatography at critical conditions (LC-CC) using a desorli/adsorli mixture as eluent. In this paper, we describe LC-CC using dimethylformamide (DMF) as pure eluent at 72 degrees C and its application to the analysis of functional polystyrenes. The critical adsorption point is reached by tuning the temperature so that the lack of repeatability is no longer a problem. We analysed several batches of polystyrenes, exhibiting different molecular weights and functionalities. We were able to differentiate di-, mono- and non-functional polystyrenes, bearing carboxylic acid, hydroxyl or nitroxide moieties. The behaviour of these polystyrenes expressed by the experimental results was compared with their behaviour described by the LC-CC theory through the calculation of the effective interaction parameter of each end group. The technique also makes it possible to quantify the fractions of different functional polymers in a blend.
authors.affiliation: Laboratoire UMR 6517, Chimie Biologie et Radicaux Libres, Equipe CROPS, Universités d'Aix-Marseille I, II et III, CNRS, Site de Saint-Jérôme, Avenue Escadrille Normandie Niemen, 13397 Marseille Cedex, France.
authors.forename: Christelle
authors.initials: C
authors.lastname: Petit
authors.forename: Benoît
authors.initials: B
authors.lastname: Luneau
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Beaudoin
authors.forename: Didier
authors.initials: D
authors.lastname: Gigmes
authors.forename: Denis
authors.initials: D
authors.lastname: Bertin
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013696:Temperature
chemical_list: D011108:Polymers; D011137:Polystyrenes