Separation of linear polyethylene from isotactic, atactic, and syndiotactic polypropylene by high-temperature adsorption liquid chromatography
Date
2009
Authors
Macko T.
Pasch H.
Journal Title
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Volume Title
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Abstract
For the first time polyolefms are separated according to tacticity by liquid chromatography. High-temperature gradient HPLC is shown to be suitable for the separation of polyethylene and polypropylene. As the stationary phase a porous carbon-based material is used; the mobile phase is composed of 1-decanol and 1,2,4-trichlorobenzene. It is shown that at an operating temperature of 160 °C linear polyethylene as well as syndiotactic and atactic polypropylenes are fully adsorbed on the stationary phase from 1-decanol. In contrast, isotactic polypropylene is fully eluted. This behavior provides a novel way for liquid chromatographic separation of polyolefins. After the isocratic elution of isotactic polypropylene with 1-decanol, all retained components are desorbed from the column packing in a gradient of 1-decanol/1,2,4-trichlorobenzene. Nearly baseline-separated peaks are obtained for all components even in the case where the components do not differ in their molar masses. © 2009 American Chemical Society.
Description
Keywords
1-decanol, Atactic, Atactic polypropylene, Column packings, High temperature, High-temperature gradient, Isocratic elution, Isotactic polypropylene, Isotactics, Linear polyethylene, Liquid chromatographic separations, Mobile phase, Operating temperature, Porous carbons, Stationary phase, Syndiotactic polypropylene, Syndiotactics, Tacticities, Trichlorobenzene, Adsorption, Chromatographic analysis, Chromatography, Desorption, High performance liquid chromatography, High pressure liquid chromatography, Liquids, Plastic products, Polypropylenes, Separation, Thermoplastics
Citation
Macromolecules
42
16
42
16