ICCAS OpenIR
Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group
Zhang, Randi; Ma, Yanping; Han, Mingyang; Solan, Gregory A.; Pi, Yaqing; Sun, Yang; Sun, Wen-Hua
2019-08-05
Source PublicationAPPLIED ORGANOMETALLIC CHEMISTRY
ISSN0268-2605
AbstractThe bis(arylimino)pyridines, 2-[CMeN{2,6-{(4-FC6H4)(2)CH}(2)-4-NO2}]-6-(CMeNAr)C5H3N (Ar = 2,6-Me2C6H3 L1, 2,6-Et2C6H3 L2, 2,6-i-Pr2C6H3 L3, 2,4,6-Me3C6H2 L4, 2,6-Et-2-4-MeC6H2 L5), each containing one N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group, have been synthesized by two successive condensation reactions from 2,6-diacetylpyridine. Their subsequent treatment with anhydrous cobalt (II) chloride gave the corresponding N,N,N '-CoCl2 chelates, Co1 - Co5, in excellent yield. All five complexes have been characterized by H-1/F-19 NMR and IR spectroscopy as well as by elemental analysis. In addition, the molecular structures of Co1 and Co3 have been determined and help to emphasize the differences in steric properties imposed by the inequivalent N-aryl groups; distorted square pyramidal geometries are adopted by each complex. Upon activation with either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), precatalyts Co1 - Co5 collectively exhibited very high activities for ethylene polymerization with 2,6-dimethyl-substituted Co1 the most active (up to 1.1 x 10(7) g (PE) mol(-1) (Co) h(-1)); the MAO systems were generally more productive. Linear polyethylenes of exceptionally high molecular weight (M-w up to 1.3 x 10(6) g mol(-1)) were obtained in all cases with the range in dispersities exhibited using MAO as co-catalyst noticeably narrower than with MMAO [M-w/M-n: 3.55-4.77 (Co1 - Co5/MAO) vs. 2.85-12.85 (Co1 - Co5/MMAO)]. Significantly, the molecular weights of the polymers generated using this class of cobalt catalyst are higher than any literature values reported to date using related N,N,N-bis (arylimino)pyridine-cobalt catalysts.
DOI10.1002/aoc.5157
Indexed BySCI
Language英语
WOS IDWOS:000480121200001
EI Accession Number1099-0739
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82680
Collection中国科学院化学研究所
AffiliationChinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Randi,Ma, Yanping,Han, Mingyang,et al. Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group[J]. APPLIED ORGANOMETALLIC CHEMISTRY,2019.
APA Zhang, Randi.,Ma, Yanping.,Han, Mingyang.,Solan, Gregory A..,Pi, Yaqing.,...&Sun, Wen-Hua.(2019).Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group.APPLIED ORGANOMETALLIC CHEMISTRY.
MLA Zhang, Randi,et al."Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group".APPLIED ORGANOMETALLIC CHEMISTRY (2019).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, Randi]'s Articles
[Ma, Yanping]'s Articles
[Han, Mingyang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, Randi]'s Articles
[Ma, Yanping]'s Articles
[Han, Mingyang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, Randi]'s Articles
[Ma, Yanping]'s Articles
[Han, Mingyang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.