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Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene
Mahrnood, Q; Guo, JJ; Zhang, WJ; Ma, YP; Liang, TL; Sun, WH
2018-03-26
Source PublicationORGANOMETALLICS
ISSN0276-7333
Volume37Issue:6Pages:957-970
AbstractThe five unsymmetrical ligands 2-[1-(2,6-dibenzhydryl- 4-tert-butylphenylimino)ethyl]-6-[1-(arytimino) ethyl]-pyridine (aryl = 2,6-Me2C6H3 (L1), 2,6-Et2C6H3 (L2), 2,6-iPr(2)C(6)H(3) (L3), 2,4,6-Me3C6H2 (IA), 2,6-Et-2-4-MeC6H2 (L5)) and the symmetrical ligand 2,6-bis(1-(2,6-dibenzhydry1-4-tert-butylphenylimino)ethyppyridine (L6) have been prepared and characterized by FT IR and H-1/C-13 NMR spectroscopy and elemental analysis. The treatment of L1-L6 with FeCl2 center dot 4H(2)O afforded the corresponding ferrous chloride complexes (Fe1-Fe6) in excellent yields. A distorted-square-pyramidal geometry with a tau(s) value of 0.13 is a feature of the X-ray structure of Fe3; broad paramagnetically shifted peaks are revealed in the H-1 NMR spectra for all the iron complexes in solution. On activation with either MAO or MMAO cocatalyst, all iron complexes displayed high activities with modest variations in activities at elevated temperature (up to 12.0 X 10(6), 12.4 X 10(6), 12.8 X 10(6), and 13.1 X 10(6) g of PE (mol of Fe)(-1) h(-1) at SO, 60, 70, and 80 degrees C, respectively). The activity at 80 degrees C is approximately 5 times higher than that of Brookhart/Gibosn's classical iron precatalyst (Fe0) under identical conditions. Moreover, the nature of the methylaluminoxane cocatalyst employed had a marked effect in defining the end groups of the polymer chain. For example, using MAO cocatalyst, vinyl and n-propyl end groups are formed with a relative ratio of 0.66/0.44, whereas for the MMAO cocatalyst, polymer chains undergo termination with isobutyl, n-propyl, and vinyl end groups having a relative ratio of 0.49/0.33/0.18, indicating that both chain transfer to Al(R)(3) and beta-hydride elimination mechanisms are functional.
MOST Discipline CatalogueChemistry
DOI10.1021/acs.organomet.7b00909
Indexed BySCI
Language英语
WOS SubjectChemistry ; Inorganic & Nuclear ; Chemistry ; Organic
WOS IDWOS:000428610100017
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/41974
Collection工程塑料实验室
Affiliation1.Zhang, WJ
2.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China.
3.Zhang, WJ
4.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.
5.Sun, WH (reprint author), Univ Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci & Int Sch, Beijing 100049, Peoples R China.
6.Zhang, WJ (reprint author), Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing Engn Res Ctr Text Nanofiber, Beijing Key Lab Clothing Mat R&D & Assessment, Beijing 100029, Peoples R China.
Recommended Citation
GB/T 7714
Mahrnood, Q,Guo, JJ,Zhang, WJ,et al. Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene[J]. ORGANOMETALLICS,2018,37(6):957-970.
APA Mahrnood, Q,Guo, JJ,Zhang, WJ,Ma, YP,Liang, TL,&Sun, WH.(2018).Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene.ORGANOMETALLICS,37(6),957-970.
MLA Mahrnood, Q,et al."Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene".ORGANOMETALLICS 37.6(2018):957-970.
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