Title: Spatially inhomogeneous crystallinity in heterogeneous ethylene-alpha-olefin copolymers
Authors: Joubert, DJ ×
Goderis, Bart
Reynaers, Harry
Mathot, Vincent #
Issue Date: Jan-2005
Publisher: John wiley & sons inc
Series Title: Journal of polymer science part b-polymer physics vol:43 issue:21 pages:3000-3018
Abstract: The crystallinity development in heterogeneous ethylene-1-butene copolymers is compared with that in ethylene copolymers, with more bulky 1-heptene as a comonomer. The thermal transitions of the 1-heptene based copolymers persistently occur at higher temperatures than of the corresponding I-butene copolymers. The earlier crystallization onset is reflected in thicker primary crystals, which in turn are associated with the presence of longer ethylene sequences because of the inaccessibility of 1-heptene to sterically shielded catalytic sites. In addition, the 1-heptene based copolymers are characterized by a higher degree of primary crystallinity, whereas the 1-butene copolymers exhibit more prominent secondary crystallization. The I-butene based copolymers thus have a less heterogeneous chemical composition distribution. At high comonomer contents, the highly heterogeneous nature of the 1-heptene copolymers is emphasized by a more pronounced presence of low crystalline spherulite inclusions accomplished by the liquid-liquid phase separation of dissimilar polymeric chains before crystallization. (c) 2005 Wiley Periodicals, Inc.
ISSN: 0887-6266
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Chemistry - miscellaneous
Polymer Chemistry and Materials
× corresponding author
# (joint) last author

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