Characterization of star-shaped polystyrene samples by size exclusion chromatography

✍ Scribed by Faramarz Afshar Taromi; Zlatka Grubisic-Gallot; Paul Rempp

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 390 KB
• Volume: 25
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(89)90177-8

✦ Synopsis

Well defined star-shaped polystyrene samples have been studied by means of size exclusion chromatography (GPC) apparatus fitted with three detectors in series, viz. low angle light scattering photometer, continuous viscometer, and differential refractometer. Thus, the light scattering intensity, the limiting viscosity number and the concentration are measured continuously on the eluate of the chromatographic column. The agreement between the molecular weight averages computed from these GPC data and those measured by standard techniques on the overall sample has been found quite satisfactory. The viscometric data arising from the GPC set-up are somewhat less accurate, but they clearly indicate the highly branched character of the samples studied. Access to the actual molecular weight distribution for a sample of star polymer is rendered possible by this method. Even the presence of linear contaminants does not interfere provided the elution curves for stars and for the linear constituents do not overlap.