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Molecular and lamellar structure of an extrusion‐grade medium‐density polyethylene for gas distribution
Author(s) -
Tränkner T.,
Hedenqvist M.,
Gedde U. W.
Publication year - 1994
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760342102
Subject(s) - molar mass , materials science , differential scanning calorimetry , polyethylene , molar mass distribution , lamellar structure , analytical chemistry (journal) , transmission electron microscopy , scanning electron microscope , extrusion , infrared spectroscopy , size exclusion chromatography , branching (polymer chemistry) , chromatography , composite material , polymer , chemistry , organic chemistry , nanotechnology , physics , thermodynamics , enzyme
An extrusion‐grade medium‐density polyethylene was fractionated by size exclusion chromatography and selective solvent extraction. The fractions were studied by infrared spectroscopy, differential scanning calorimetry, and transmission electron microscopy. Infrared spectroscopy showed that chain branching was concentrated to the low molar mass material. Transmission electron microscopy showed the presence of roof‐shaped crystals in the low molar mass samples and curved S‐or C‐shaped lamellae in the high molar mass samples. These features could be used for identification of different molar mass species in the unfractionated sample.