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Chromatographia

, Volume 82, Issue 4, pp 725–732 | Cite as

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

  • Tibor Macko
  • Jan-Hendrik Arndt
  • Robert BrüllEmail author
Original
  • 55 Downloads
Part of the following topical collections:
  1. 24th International Symposium on Separation Sciences combined with 21st International Conference Analytical Methods and Human Health

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 Hypercarb™ and a solvent gradient 2-ethyl-1-hexanol (or cyclohexanone) → 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.

Graphical Abstract

Keywords

HPLC EVA copolymers Hypercarb Adsorption, chemical composition distribution 

Notes

Acknowledgements

Advice and help at work with the PL GPC220 chromatograph and the ELS detector offered by Mr. R. Linz (Agilent, Darmstadt, Germany), Dr. S. O’Donohue and Dr. J. Yakhoul (Agilent, Church Stretton, England) are highly appreciated.

Compliance with Ethical Standards

Conflict of interest

The authors declare they has no conflict of interests.

Ethical approval

This article does not contain any studies with human participants or animals performed by authors. The authors confirm compliance with ethical standards.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Division Plastics, Group Material AnalyticsFraunhofer Institute for Structural Durability and System Reliability LBFDarmstadtGermany

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