End‐Group Selectivity of Low‐Molecular‐Weight Polystyrenes on a Carbon‐Clad Zirconia Stationary Phase in Reversed‐Phase HPLC

Autor:	Paul Wormell, R. Andrew Shalliker, Alan P. Sweeney
Rok vydání:	2002
Předmět:	Polymers and Plastics Organic Chemistry Analytical chemistry Reversed-phase chromatography Condensed Matter Physics Oligomer chemistry.chemical_compound End-group chemistry Phase (matter) Materials Chemistry Cubic zirconia Polystyrene Physical and Theoretical Chemistry Selectivity Acetonitrile
Zdroj:	Macromolecular Chemistry and Physics. 203:375-380
ISSN:	1521-3935 1022-1352
DOI:	10.1002/1521-3935(20020101)203:2<375::aid-macp375>3.0.co;2-#
Popis:	The separation of isomers of polystyrene oligomers was demonstrated on a carbon-clad zirconia stationary phase in an acetonitrile mobile phase. The carbonclad zirconia surface gave considerably better resolution of isomers than a C18 surface, and the separation was sensitive to the end group of the oligomer. Oligomers with sec-butyl end groups displayed almost twice as many isomers as the corresponding n-butyl oligomer on the carbon-clad zirconia surface. These additional bands could be explained by the stereochemistry of the sec-butyl end group. In addition, the migration rate of the polystyrene isomers was dependent upon the end group, with n-butyl polystyrenes displaying significantly greater retention on the carbon-clad zirconia stationary phase. In comparison, the selectivity of conventional C18 columns could not discriminate between the n-butyl and sec-butyl end groups.
Databáze:	OpenAIRE
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