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Characterisation of the Chemical Composition Distribution of LLDPE Using Interactive Liquid Chromatography
Author(s) -
Dolle Volker,
Albrecht Andreas,
Brüll Robert,
Macko Tibor
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000653
Subject(s) - comonomer , elution , chemistry , fractionation , ethylene glycol , solvent , copolymer , chromatography , molar mass , phase (matter) , ethylene , silica gel , analytical chemistry (journal) , polymer chemistry , organic chemistry , catalysis , polymer
It is demonstrated that copolymers of ethylene with higher 1‐olefins can be separated using bare silica gel as the stationary phase and a gradient of ethylene glycol monobutyl ether and 1,2,4‐trichlorobenzene as the mobile phase at 160 °C. The separation of ethylene 1‐hexene copolymers according to their composition is confirmed by linking the chromatographic separation to infrared spectroscopy. Using well‐characterised model fractions from temperature rising elution fractionation or solvent/non‐solvent fractionation (“Holtrup”), it can be shown that both the content and type of the comonomer mainly govern the elution in two peaks which differ in their comonomer content. The molar mass only plays a subordinate rule.