Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene
文献类型：期刊论文
| 作者 | Mahrnood, Q; Guo, JJ; Zhang, WJ; Ma, YP; Liang, TL; Sun, WH
|
| 刊名 | ORGANOMETALLICS
 |
| 出版日期 | 2018-03-26 |
| 卷号 | 37期号:6页码:957-970 |
| ISSN号 | 0276-7333 |
| DOI | 10.1021/acs.organomet.7b00909 |
| 英文摘要 | The 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. |
| 语种 | 英语 |
| WOS记录号 | WOS:000428610100017 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/41974]  |
| 专题 | 化学研究所_工程塑料实验室 |
| 作者单位 | 1.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. |
| 推荐引用方式 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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来源：化学研究所
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