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Characterization and Morphological Distribution of Ethylene Content in Impact Propylene Copolymers
Author(s) -
SantonjaBlasco Laura,
Rungswang Wonchalerm,
Alamo Rufina G.
Publication year - 2018
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.201700046
Subject(s) - polypropylene , differential scanning calorimetry , copolymer , ethylene , materials science , ethylene propylene rubber , gel permeation chromatography , fractionation , chemical engineering , morphology (biology) , polymer chemistry , amorphous solid , polymer , chromatography , composite material , chemistry , organic chemistry , catalysis , physics , genetics , biology , engineering , thermodynamics
The effect of ethylene content, in a range between 8 and 11 mol%, and distribution on the solid‐state morphology of five impact polypropylene copolymers (IPC) have been studied via SEM, fractionation and microstructural characterization via gel permeation chromatography (GPC), high‐temperature thermal‐gradient interaction chromatography (HT‐TGIC), and differential scanning calorimetry (DSC). All copolymers display heterophasic morphology, with rubbery droplets randomly distributed in a predominant i PP matrix. While the mass fraction of amorphous ethylene‐propylene rubber molecules is very similar for all IPC studied, the size of the droplets increases from 0.6 to 1.1 μm with increasing ethylene content. This change in droplet size is correlated with changes in the composition of the crystalline ethylene‐propylene (CEP) component extracted via fractionation.