Abstract
Linear polyethylene and isotactic polypropylene samples were dissolved in 1,1,2,2-tetrachloroethane or 1,2,3-trichloropropane and injected at 135 °C into columns packed with porous particles of hydroxyapatite, aluminium oxide, zirconium oxide, Florisil, or silica gel. Both polymers were retained, to different extents, within the columns. It is hypothesized that the polymers interact with the surfaces of the adsorbents and are adsorbed. Retention of isotactic polypropylene from 1,1,2,2-tetrachloroethane was in the order aluminium oxide > hydroxyapatite ≈ zirconium oxide ≈ Florisil ≈ silica gel. Recovery of polyethylene from 1,1,2,2-tetrachloroethane was almost the same on aluminium oxide, hydroxyapatite, zirconium oxide, and Florisil; it was more retained by silica gel. Polyethylene was usually more retained than polypropylene. Recovery of polyethylene from both chlorinated solvents was similar whereas recovery of polypropylene was better from 1,2,3-trichloropropane than from 1,1,2,2-tetrachloroethane. Both chlorinated solvents are toxic and may attack seals in a Waters 150C chromatograph. Moreover, the polymers may be chlorinated in these solvents. For these reasons they are not optimum solvents for routine analysis. This is the first time polyethylene and polypropylene have been found to be retained by adsorbents with pore diameters in the range 60–300 Å. Desorption of the retained polymers is possible with some polar solvents.
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Acknowledgments
The authors thank BMBF (Germany) and Basell GmbH (Ludwigshafen, Germany; Project Code 03C035YA) for financial support. Advice on the use of the evaporative light-scattering detector provided by Dr Jade Yakoul (Polymer Laboratories, Church Stretton, UK) are appreciated. T.M. thanks Dr Dusan Berek (Polymer Institute, Bratislava, Slovakia) for the samples of Florisil and aluminium oxide and Dr J.F.M. Denayer (Vrije Universiteit, Brussels, Belgium) for the sample of zeolite MCM-41. The authors would also like to thank Dr David Hunkeler for grammatical correction of this publication.
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Macko, T., Pasch, H., Milonjic, S.K. et al. Adsorption of Linear Polyethylene and Isotactic Polypropylene from 1,1,2,2-Tetrachloroethane and 1,2,3-Trichloropropane on to Polar Adsorbents. Chroma 64, 183–190 (2006). https://doi.org/10.1365/s10337-006-0010-z
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DOI: https://doi.org/10.1365/s10337-006-0010-z