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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/9877

Title: Effects of Molecular Dispersion State of Surface Ti Species on Ethylene-Propylene Copolymerization with TiCl_3-based Ziegler-Natta Model Catalyst
Authors: Taniike, Toshiaki
Takahashi, Shougo
Wada, Toru
Kouzai, Iku
Terano, Minoru
Keywords: role of dispersion state of Ti species
supported Ziegler
Natta catalysts
Issue Date: 2010
Publisher: Springer
Magazine name: Macromolecular Research
Volume: 18
Number: 9
Start page: 834
End page: 838
DOI: 10.1007/s13233-010-0904-3
Abstract: The dispersion state of surface Ti species is one of the most important factors for polymerization properties of MgCl_2-supported heterogeneous Ziegler-Natta catalysts. In this paper, ethylene-propylene copolymerization was conducted using a novel Ziegler-Natta model catalyst having “isolated” and “clustered” TiCl_3 molecules on MgCl_2. At a lower ethylene/propylene feed ratio, the dispersion state of the Ti species was found to stronglyaffect both the composition and sequence distribution of copolymers. The “isolated” Tispecies gave a relatively random copolymer and clustering of Ti species obviously enhanced the blockiness. The addition of an external donor basically deteriorated the random copolymerization character of the “isolated Ti species, but the degree of the deterioration depended on the kind of donors. On the contrary, the balance between themonomer feed and consumption dominated the copolymerization performance at a higher ethylene/propylene feed ratio to obscure the effects of the dispersion state.
Rights: This is the author-created version of Springer, Toshiaki Taniike, Shougo Takahashi, Toru Wada, Iku Kouzai, Minoru Terano, Macromolecular Research, 18(9), 2010, 834-838. The original publication is available at www.springerlink.com, http://dx.doi.org/10.1007/s13233-010-0904-3
URI: http://hdl.handle.net/10119/9877
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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