Micellar electrokinetic chromatography applied to copolymer systems with heterogeneous distribution

Citation
A. Gallardo et al., Micellar electrokinetic chromatography applied to copolymer systems with heterogeneous distribution, MACROMOLEC, 32(3), 1999, pp. 610-617
Citations number
40
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULES
ISSN journal
00249297 → ACNP
Volume
32
Issue
3
Year of publication
1999
Pages
610 - 617
Database
ISI
SICI code
0024-9297(19990209)32:3<610:MECATC>2.0.ZU;2-U
Abstract
The kinetic analysis and the characterization of copolymer systems at high conversion based on the free radical polymerization of N-vinylpyrrolidone, VP, and 2-hydroxyethyl methacrylate, HEMA, is analyzed on the basis of the reactivity ratios of these monomers as obtained by the Tidwell and Mortimer nonlinear method. Characterization of copolymers prepared at different con version degrees was carried out by using micellar electrokinetic chromatogr aphy, MEKC, as well as by size exclusion chromatography, SEC. The experimen tal results obtained demonstrate a noticeable change of the composition of copolymer chains with the conversion degree and a good agreement between th e approximation of the Skeist's kinetic treatment and the experimental data . Both MEKC and SEC provide valuable complementary information with respect to the average composition of copolymer chains and their macromolecular si ze and size distribution. To our knowledge this is the first time that MEKC has been applied to the characterization of high molecular weight copolyme r systems.