NDLI: Effects of molecular dispersion state of surface Ti species on ethylene-propylene copolymerization with TiCl3-based Ziegler-Natta model catalyst

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Effects of molecular dispersion state of surface Ti species on ethylene-propylene copolymerization with TiCl3-based Ziegler-Natta model catalyst

Content Provider	Semantic Scholar
Author	Taniike, Toshiaki Takahashi, Shougo Wada, Tôru Kouzai, Iku Terano, Minoru
Copyright Year	2010
Abstract	The dispersion state of surface Ti species is one of the most important factors affecting the polymerization properties of MgCl2-supported heterogeneous Ziegler-Natta catalysts. In this paper, ethylene-propylene copolymerization was carried out using a novel Ziegler-Natta model catalyst with “isolated” and “clustered” TiCl3 molecules on MgCl2. At a lower ethylene/propylene feed ratio, the dispersion state of the Ti species strongly affected both the composition and sequence distribution of the copolymers. The “isolated” Ti species gave a relatively random copolymer, and clustering of Ti species enhanced the bulkiness. The addition of an external donor basically deteriorated the random copolymerization character of the “isolated Ti species but the degree of deterioration depended on the type of donors. On the other hand, the balance between the monomer feed and consumption dominated the copolymerization performance at a higher ethylene/propylene feed ratio to obscure the effects of the dispersion state.
Starting Page	834
Ending Page	838
Page Count	5
File Format	PDF HTM / HTML
DOI	10.1007/s13233-010-0904-3
Volume Number	18
Alternate Webpage(s)	https://dspace.jaist.ac.jp/dspace/bitstream/10119/9877/1/15480.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s13233-010-0904-3
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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