NDLI: Synergistic effects of the ZnCl2-SiCl4 modified TiCl4/MgCl2/THF catalytic system on ethylene/1-hexene and ethylene/1-octene copolymerizations

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Chinese Journal of Polymer Science : Volume 31

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Synergistic effects of the ZnCl2-SiCl4 modified TiCl4/MgCl2/THF catalytic system on ethylene/1-hexene and ethylene/1-octene copolymerizations

Content Provider	Springer Nature Link
Author	Phiwkliang, Wanna Jongsomjit, Bunjerd Praserthdam, Piyasan
Copyright Year	2014
Abstract	The copolymerizations of ethylene with 1-hexene or 1-octene by using TiCl4/MgCl2/THF catalysts modified with different metal halide additives (ZnCl2, SiCl4, and the combined ZnCl2-SiCl4) were investigated based on catalytic activity and copolymer properties. It was found that the catalyst modified with mixed ZnCl2-SiCl4 revealed the highest activities for both ethylene/1-hexene and ethylene/1-octene copolymerization. The increase in activities was due to the formation of acidic sites by modifying the catalysts with Lewis acids. Based on the FTIR measurements, the characteristic C-O-C peaks of the catalysts modified with metal halide additives were slightly shifted to lower wavenumber when compared to the unmodified catalyst. This showed that the modified catalysts could generate more acid sites in the TiCl4/MgCl2/THF catalytic system leading to an increase in activities as well as comonomer insertion (as proven by 13C-NMR). However, Lewis acidmodifications did not affect the microstructure of the copolymers obtained. By comparison on the properties of copolymers prepared with the unmodified catalyst, it was found that polymers with ZnCl2 and/or SiCl4 modification exhibited a slight decrease in melting temperature, crystallinity and density. It is suggested that these results were obtained based on the different amount of α-olefins insertion, regardless of the types of Lewis acids and comonomer.
Starting Page	84
Ending Page	91
Page Count	8
File Format	PDF
ISSN	02567679
Journal	Chinese Journal of Polymer Science
Volume Number	32
Issue Number	1
e-ISSN	14396203
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-12-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ziegler-Natta catalyst Lewis acid Copolymerization of ethylene with α-olefin SiCl4 ZnCl2 Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Chemical Engineering Polymers and Plastics

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