Characteristics of diether- and phthalate-based Ziegler-Natta catalysts for copolymerization of propylene and ethylene and terpolymerization of propylene, ethylene, and 1-butene

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Copolymerization of propylene and ethylene and terpolymerization of propylene, ethylene, and 1-butene were carried out to compare the characteristics of diether-and phthalate-based Ziegler-Natta catalysts in a reaction system of pilot scale. The ethylene incorporation with the diether-based catalyst was higher but the 1-butene incorporation was lower compared with those of the phthalate-based catalyst. In the case of copolymers from the diether-based catalyst, melting behavior, determined through differential scanning calorimetry (DSC), showed a distinct shoulder peak and lots of nuclei were formed during crystallization. The diether-based catalyst led to polymers having blockier ethylene sequences compared with those of the phthalate-based catalyst; the highly crystallizable fraction (HIS) containing blockier ethylene sequences was produced with the diether-based catalyst. These results seem to be the result of regio-irregular characteristics of the diether-based catalyst.
Publisher
WILEY-BLACKWELL
Issue Date
2013-10
Language
English
Article Type
Article
Keywords

ELECTRON-DONORS; PROPENE POLYMERIZATION; MGCL2-SUPPORTED CATALYSTS; ACTIVE-CENTER; MGCL2; TOOL; MICROSTRUCTURE; TICL4

Citation

JOURNAL OF APPLIED POLYMER SCIENCE, v.130, no.2, pp.851 - 859

ISSN
0021-8995
DOI
10.1002/app.39244
URI
http://hdl.handle.net/10203/176495
Appears in Collection
CBE-Journal Papers(저널논문)
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