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Diode-array detection with spectral suppression in size exclusion and adsorption chromatography for rapid evaluation of chemical composition in block copolymers of styrene and methyl methacrylate

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
33
Issue
19
Identifiers
DOI: 10.1016/0032-3861(92)90616-5
Keywords
  • Block Copolymers
  • Liquid Adsorption Chromatography
  • Diode-Array Detection
  • Microcolumn
  • Size Exclusion Chromatography
  • Polystyrene
  • Poly(Methyl Methacrylate)
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract Diode-array detection has been applied to evaluate the chemical composition of block copolymers from chromatographic data. Two different modes of chromatography have been used for separation: size exclusion chromatography and adsorption chromatography, based on tertiary mixed eluents, comprising tetrahydrofuran, acetonitrile and dichloromethane on a microcolumn, packed with 5 μm wide-pore silica gel (mean pore size 300 Å). U.v. spectral data acquired on-line were manipulated to generate spectral suppression chromatograms in order to selectively detect each component of a block copolymer chromatographed under both size exclusion and critical thermodynamic conditions. The content of polystyrene and poly(methyl methacrylate) residues in a series of model block copolymers of nominally constant composition (∼ 1:1, w/w), but differing in molecular weight, could be rapidly determined by this novel combination of chromatographic selectivity enhanced by digital discrimination. Thus, diode-array detection has significant potential for fast on-line monitoring of polymer processing.

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