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  4. HPLC Separation of Ethylene-Vinyl Acetate Copolymers According to Chemical Composition
 
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2019
Journal Article
Titel

HPLC Separation of Ethylene-Vinyl Acetate Copolymers According to Chemical Composition

Abstract
Ethylene-vinyl acetate (EVA) copolymers are in dependence on their chemical composition, amorphous, or semicrystalline materials. Therefore, fractionation techniques which are based on crystallization, such as temperature rising elution fractionation (TREF) and crystallization fractionation (CRYSTAF), cannot offer information about the chemical composition distribution of these polymers in the case of amorphous samples. Liquid chromatography has been shown to be a valuable alternative; yet, systems based on silica gel lacked in terms of long-term stability. Using porous graphite, this drawback may be overcome. An HPLC column packed with porous graphite HypercarbTM and a solvent gradient 2-ethyl-1-hexanol (or cyclohexanone) RT 1,2,4-trichlorobenzene can separate EVA copolymers over the full range of VA content at temperatures above 100 °C. A linear dependence between the VA content of the copolymers and their elution volume could be established. Moreover, the chromatographic resolution is larger than obtained using silica gel as stationary phase.
Author(s)
Macko, Tibor
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF
Arndt, Jan-Hendrik
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF
Brüll, Robert
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF
Zeitschrift
Chromatographia
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DOI
10.1007/s10337-019-03697-x
Language
English
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Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF
Tags
  • HPLC

  • EVA copolymers

  • Hypercarb

  • adsorption

  • chemical composition ...

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