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Separation and Characterization of Ethylene‐Propylene Copolymers by High‐Temperature Gradient HPLC Coupled to FTIR Spectroscopy
Author(s) -
Albrecht Andreas,
Heinz LarsChristian,
Lilge Dieter,
Pasch Harald
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200751104
Subject(s) - fourier transform infrared spectroscopy , copolymer , ethylene , high performance liquid chromatography , ethylene glycol , elution , chromatography , solvent , materials science , phase (matter) , chemistry , precipitation , spectroscopy , analytical chemistry (journal) , chemical engineering , polymer , organic chemistry , catalysis , physics , meteorology , engineering , quantum mechanics
Summary: The chromatographic separation of ethylene‐propylene (EP) copolymers with regard to chemical composition was accomplished by a new technique ‐ high‐ temperature gradient HPLC. Using a mobile phase of ethylene glycol monobutylether (EGMBE) and 1,2,4–trichlorobenzene (TCB), and silica gel as the stationary phase, copolymers with different ethylene contents were separated according to their chemical compositions. Using a sample solvent of n‐decanol and a column temperature of 140 °C, chromatographic conditions were established that correspond to separation in a precipitation‐redissolution mechanism. With the aim to obtain further information on the separation process, the HPLC system was coupled to FTIR spectroscopy through a LC‐Transform interface. The FTIR data confirmed that the copolymers were separated according to the ethylene content of the eluted samples.