NDLI: Synthesis and characterization of novel chromium catalyst and polyethylene with high molecular weight

Content Provider	Springer Nature Link
Author	Zhengzai, Cheng Junquan, Sun Ying, Li Shansheng, Xu Baiquan, Wang
Copyright Year	2005
Abstract	Mononuclear carbon bridged cyclopentadienyl chromium complexes of the type [(C$_{5}$H$_{4}$) C (C$_{5}$H$_{10}$)CH$_{2}$(C$_{5}$H$_{4}$N)]CrCl$_{2}$(1), [(C$_{5}$H$_{4}$)C(CH$_{3}$)$_{2}$CH$_{2}$(C$_{5}$H$_{4}$N)]CrCl$_{2}$(2) and homodinuclear chromium complex of the type (CH$_{3}$)$_{2}${[(C$_{5}$H$_{3}$)C(CH$_{3}$)$_{2}$CH$_{2}$(C$_{5}$H$_{4}$N)]CrCl$_{2}$}$_{2}$(3) were prepared by treatment of the lithium salts of cyclopentadiene ligands with pyridyl group with CrCl$_{3}$(THF)$_{3}$ in THF solution. All complexes were structurally characterized by mass spectra and elemental analysis. The structure of complex 1 was determined by X-ray diffraction analysis. Activated by MAO, complexes 1 and 2 are efficient catalysts in the polymerization of ethylene yielding polyethylene (BE) with a high molecular weight (M$_{v}$ ranging from 225800 to 637800 g·mol$^{−1}$, 30≤T$_{p}$≤70°C under 0.9 MPa monomer pressure). High activities of polymerization are related to the unique electronic and steric structure of complexes 1 and 2. The melting points of the polymers determined by DSC and characterization data of$^{13}$C NMR all show the synthesis of linear polyethylene (LPE) with a low branching extent.
Starting Page	50
Ending Page	55
Page Count	6
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	21
Issue Number	2
e-ISSN	19930437
Language	English
Publisher	Wuhan University of Technology
Publisher Date	2005-01-01
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cyclopentadienylchromium catalyst ethylene polymerization crystal structure Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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