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Narrow dispersed linear polyethylene using cobalt catalysts bearing cycloheptyl-fused bis(imino)pyridines; probing the effects of ortho-benzhydryl substitution
Bariashir, C; Wang, Z; Suo, HY; Zada, M; Solan, GA; Ma, YP; Liang, TL; Sun, WH
2019
Source PublicationEUROPEAN POLYMER JOURNAL
ISSN0014-3057
Volume110Pages:240-251
AbstractThe cycloheptyl-fused cobalt(II) chloride complexes, [2,3:5,6-{C4H8C(N(2-R-1-4-R-2-6-(CHPh2)C6H2))}(2)C5HN]CoCl2 (R-1 = R-2 = Me Co1, R-1 = Me, R-2 = CHPh2 Co2, R-1 = Et, R-2 = CHPh2 Co3, R-1 = i-Pr, R-2 = CHPh2 Co4, R-1 = Cl, R-2 = CHPh2 CoS, R-1 = CHPh2, R-2 = i-Pr Co6, R-1 = CHPh2, R-2 = t-Bu Co7, R-1 = CHPh2, R-2 = F Co8), have been prepared by a one-pot template approach. The molecular structures of Col, Co6 and Co8 highlight the varying degrees of steric protection of the metal center imposed by the ortho-benzhydryl/-R-1 group pairing. On activation with either MAO or MMAO, Co1-Co5 collectively displayed high activity (up to 2.87 x 10(6) g (PE) mol(-1) (Co) h(-1) at 40 degrees C) affording highly linear low molecular weight poly-ethylene (M-w range: 12.8-59.4 kg mol(-1)) with narrow polydispersities (M-w/M-n range: 1.4-2.7). End-group analysis of the polymers highlights the importance of both beta-H elimination and chain transfer to aluminum as termination pathways. In relative terms, MMAO proved a marginally more effective activator than MAO with the catalytic activity, in either case, falling in the order: Col > Co5 > Co2 > Co3 > Co4. In marked contrast, the 2,6-(CHPh2)(2)-substituted precatalysts, Co6, Co7 and Co8 gave, in the presence of the same aluminoxane activators, only trace amounts of polyethylene.
KeywordCobalt Coordination-insertion polymerization Linear polyethylene beta-hydride elimination Catalytic activity
MOST Discipline CataloguePolymer Science
DOI10.1016/j.eurpolymj.2018.11.010
Indexed BySCI
Language英语
WOS SubjectPolymer Science
WOS IDWOS:000456751000030
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/41957
Collection工程塑料实验室
Affiliation1.Solan, GA
2.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China.
3.Sun, WH (reprint author), Univ Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Beijing 100049, Peoples R China.
4.Solan, GA (reprint author), Univ Leicester, Dept Chem, Univ Rd, Leicester LE1 7RH, Leics, England.
5.Sun, WH (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China.
Recommended Citation
GB/T 7714
Bariashir, C,Wang, Z,Suo, HY,et al. Narrow dispersed linear polyethylene using cobalt catalysts bearing cycloheptyl-fused bis(imino)pyridines; probing the effects of ortho-benzhydryl substitution[J]. EUROPEAN POLYMER JOURNAL,2019,110:240-251.
APA Bariashir, C.,Wang, Z.,Suo, HY.,Zada, M.,Solan, GA.,...&Sun, WH.(2019).Narrow dispersed linear polyethylene using cobalt catalysts bearing cycloheptyl-fused bis(imino)pyridines; probing the effects of ortho-benzhydryl substitution.EUROPEAN POLYMER JOURNAL,110,240-251.
MLA Bariashir, C,et al."Narrow dispersed linear polyethylene using cobalt catalysts bearing cycloheptyl-fused bis(imino)pyridines; probing the effects of ortho-benzhydryl substitution".EUROPEAN POLYMER JOURNAL 110(2019):240-251.
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