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Characterization of poly[di(carboxylatophenoxy)-phosphazene] by an aqueous gel permeation chromatography

✍ Scribed by Alexander K. Andrianov; Mark P. Le Golvan

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 577 KB
Volume: 60
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19960620)60:12<2289::aid-app28>3.0.co;2-0

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✦ Synopsis

A water-soluble phosphazene polyelectrolyte, poly[di(carboxylatophenoxy)phosphazene] (PCPP), was characterized using aqueous gel-permeation chromatography (GPC) with concentration (UV and RI) and molecular weight sensitive (multiangle laser light-scattering) detectors. Agreement was observed between the weight-average molecular weights determined by GPC with a light-scattering detector, conventional GPC using fractionated narrow PCPP standards, and also by static light-scattering measurements. The effect of chromatography conditions, such as ionic strength of the mobile phase, column resolution, and injection volume was investigated. Mark-Houwink constants of PCPP in aqueous solution (phosphate buffer, pH 7.4,0.42M NaCl) were determined. The validity of the universal calibration curve and the occurrence of a secondary nonexclusion mechanism of separation in aqueous GPC of phosphazene polyelectrolytes are discussed.

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