Separation of propene/1-alkene and ethylene/1-alkene copolymers by high-temperature adsorption liquid chromatography

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dc.contributor.authorMacko T.
dc.contributor.authorBrull R.
dc.contributor.authorAlamo R.G.
dc.contributor.authorThomann Y.
dc.contributor.authorGrumel V.
dc.date.accessioned2011-05-15T16:02:16Z
dc.date.available2011-05-15T16:02:16Z
dc.date.issued2009
dc.description.abstractA high performance liquid chromatography column (HPLC) Hypercarb® packed with porous graphite has proven to discriminate polyolefin molecules due to differences in their adsorption and desorption behaviour. While linear polyethylene (PE) and syndiotactic polypropylene (sPP) are adsorbed on the graphite packing, isotactic polypropylene (iPP) is not adsorbed. The column operates at 160 °C with 1-decanol as sample solvent and mobile phase. We have now tested this HPLC system for separations of random propene/1-alkene and ethylene/1-hexene copolymers: While copolymers of propene with 1-butene, 1-hexene and 1-octene copolymers eluted in size exclusion mode without adsorption, propene/1-octadecene and ethylene/1-hexene copolymers are strongly retained and eluted only after application of a linear gradient starting from 1-decanol and ending with pure 1,2,4-trichlorobenzene. The retention of propene/1-alkene (>11 carbons in the side chain) copolymers increases with the concentration of comonomer, making this HPLC system suitable to separate these copolymers according to their chemical composition. In contrast, the retention of ethylene/1-hexene samples decreases with increasing 1-hexene content. Branching in this case shortens the length of continuous methylene sequences of the polymer backbone, which are expected to adsorb in a planar conformation to the graphite layers. This is the first report on the separation of short chain branched polyolefins by high-temperature adsorption liquid chromatography. © 2009 Elsevier Ltd. All rights reserved.
dc.description.versionArticle
dc.identifier.citationPolymer
dc.identifier.citation50
dc.identifier.citation23
dc.identifier.issn323861
dc.identifier.other10.1016/j.polymer.2009.09.057
dc.identifier.urihttp://hdl.handle.net/10019.1/12393
dc.subject1-butene
dc.subject1-decanol
dc.subject1-Hexene
dc.subject1-octene
dc.subjectBranched polyolefins
dc.subjectChemical compositions
dc.subjectCo-monomer
dc.subjectConcentration of
dc.subjectEthylene/1-hexene
dc.subjectGraphite layers
dc.subjectHigh performance liquid chromatography columns
dc.subjectHigh temperature
dc.subjectHypercarb
dc.subjectIsotactic poly(propylene) (iPP)
dc.subjectLinear gradients
dc.subjectLinear polyethylene
dc.subjectMethylene sequences
dc.subjectMobile phase
dc.subjectOctadecene
dc.subjectPlanar conformations
dc.subjectPolymer backbones
dc.subjectPorous graphite
dc.subjectSample solvent
dc.subjectSide chains
dc.subjectSize exclusion mode
dc.subjectSyndiotactic polypropylene (sPP)
dc.subjectTrichlorobenzene
dc.subjectAdsorption
dc.subjectButenes
dc.subjectChromatographic analysis
dc.subjectColumn chromatography
dc.subjectCopolymerization
dc.subjectCopolymers
dc.subjectDesorption
dc.subjectGraphite
dc.subjectHigh pressure liquid chromatography
dc.subjectHydrocarbons
dc.subjectLiquids
dc.subjectPlastic products
dc.subjectPolyethylenes
dc.subjectPolypropylenes
dc.subjectPropylene
dc.subjectSeparation
dc.subjectThermoplastics
dc.subjectHigh performance liquid chromatography
dc.subjectadsorption
dc.subjectcopolymer
dc.subjectdesorption
dc.subjectisotactic polymer
dc.subjectphase separation
dc.subjectpolypropylene
dc.subjectsyndiotactic polymer
dc.titleSeparation of propene/1-alkene and ethylene/1-alkene copolymers by high-temperature adsorption liquid chromatography
dc.typeArticle
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