Porous graphite as stationary phase for the chromatographic separation of polymer additives - determination of adsorption capability by Raman spectroscopy and physisorption

Kot D, Zou M, Brunnengräber K, Arndt JH, Macko T, Etzold BJ, Brüll R (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Journal of Chromatography A Elsevier

Book Volume: 1625

Article Number: 461302

DOI: 10.1016/j.chroma.2020.461302

Abstract

Additives are added to polymers in small concentration to achieve desired application properties widely used to tailor the properties. The rapid diversification of their molecular structures, with often only minute differences, necessitates the development of adequate chromatographic techniques. While modified silica so far is the workhorse as stationary phase we have probed the potential of porous graphitic carbon (Hypercarb^TM) for this purpose. The results show that the multitude of physicochemical interactions between analyte molecules and the graphitic surface enables separations of polyolefin stabilizers with unprecedented selectivity. To support the chromatographic results the adsorption capability of Hypercarb^TM for selected antioxidants and UV absorbers has been determined by Raman spectroscopy and argon physisorption measurements. The shift of the Graphite-band in the Raman spectra of Hypercarb^TM upon infusion with additives correlates with the changes in the Adsorption Potential Distributions. The results of argon physisorption measurements go hand in hand with the chronology of desorption of the additives in liquid chromatography experiments. The elution sequence can be explained by van der Waals or London forces, π-π-interactions and electron lone pair donor-acceptor interactions between the graphite surface and analyte functional groups.

Authors with CRIS profile

Bastian Etzold

Involved external institutions

Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF

Germany (DE) Technische Universität Darmstadt

Germany (DE)

How to cite

APA:

Kot, D., Zou, M., Brunnengräber, K., Arndt, J.H., Macko, T., Etzold, B.J., & Brüll, R. (2020). Porous graphite as stationary phase for the chromatographic separation of polymer additives - determination of adsorption capability by Raman spectroscopy and physisorption. Journal of Chromatography A, 1625. https://doi.org/10.1016/j.chroma.2020.461302

MLA:

Kot, David, et al. "Porous graphite as stationary phase for the chromatographic separation of polymer additives - determination of adsorption capability by Raman spectroscopy and physisorption." Journal of Chromatography A 1625 (2020).

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