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Separation of Poly(propylene) Samples According to Tacticity Using a Hypercarb Column
Author(s) -
Macko Tibor,
Cutillo Francesco,
Busico Vincenzo,
Brüll Robert
Publication year - 2010
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.201000050
Subject(s) - tacticity , elution , materials science , fraction (chemistry) , column chromatography , analytical chemistry (journal) , chromatography , polypropylene , graphite , phase (matter) , polymer chemistry , chemistry , organic chemistry , polymer , polymerization , composite material
Summary: Samples of polypropylene having different stereoregularities, i.e ., differing in the isotactic or syndiotactic stereosequence distribution, were separated by means of high‐temperature gradient adsorption liquid chromatography. The porous graphite was used as stationary phase in the column packing (Hypercarb®). Predominantly isotactic samples eluted in 1‐decanol, while predominantly syndiotactic samples eluted in a binary gradient composed of 1‐decanol and 1,2,4‐trichlorobenzene. Their elution volumes increased with the average content of the syndiotactic units ( racemo dyads mole fraction as determined with the NMR spectroscopy) in the samples. Thus these chromatographic separations represent a new method for the analysis and characterization of stereoregular polyolefins. It requires substantially less time and solvents than the commonly used methods.