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Polymer Bulletin
Erschienen in: Polymer Bulletin 2/2012

01.01.2012 | Original Paper

Homo- and copolymerizations of ethylene and α-olefins in n-hexane catalyzed by Ni(ii)-α-diimine catalyst

verfasst von: Xinhua Yan, Zhifeng Fu, Yingqi Li, Yan Shi

Erschienen in: Polymer Bulletin | Ausgabe 2/2012

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Abstract

Ni(II)-α-diimine catalyst [(2,6-i-Pr)2C6H3-DAB(An)]NiBr2 plus methylaluminoxane was successfully used in the homopolymerization of ethylene, 1-hexene, and 1-octene and the copolymerization of ethylene with 1-hexene and 1-octene in n-hexane. The polymerization of 1-octene was conducted in a controlled manner with a narrow molecular weight distribution (M w/M n = 1.2–1.5) and with the weight-average molecular weight increasing linearly with the monomer conversion. The molecular weights, T g, T m, branching degree, and density of the obtained (co)polymers were greatly controlled by ethylene pressure and polymerization temperature. Compared with that of ethylene homopolymer, the branching degree of the copolymers prepared by the copolymerization of ethylene with 1-hexene or 1-octene increased, whereas the molecular weight, density, T m, and catalyst activity decreased. However, compared with those of the homopolymer of 1-hexene or 1-octene, the copolymer density, T m, and catalyst activity increased, whereas the branching degree declined.
Vorheriger Artikel Highly sulfonated poly(phenylene sulfones): optimization of the polymerization conditions
Nächster Artikel Household LED irradiation under air: cationic polymerization using iridium or ruthenium complex photocatalysts

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Metadaten
Titel
Homo- and copolymerizations of ethylene and α-olefins in n-hexane catalyzed by Ni(ii)-α-diimine catalyst
verfasst von
Xinhua Yan
Zhifeng Fu
Yingqi Li
Yan Shi
Publikationsdatum
01.01.2012
Verlag
Springer-Verlag
Erschienen in
Polymer Bulletin / Ausgabe 2/2012
Print ISSN: 0170-0839
Elektronische ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-011-0540-x

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