Multi-walled carbon nanotubes as a ligand in nickel α-diimine based ethylene polymerization

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• 作者：Sasan Talebnezhad ; Saeed Pourmahdian
• 关键词：α ; Diiminonickel catalyst ; Ligand ; Multi ; walled carbon nanotubes ; Ethylene polymerization ; In situ catalyst preparation
• 刊名：Chinese Journal of Polymer Science
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：33
• 期：10
• 页码：1389-1403
• 全文大小：1,699 KB
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• 作者单位：Sasan Talebnezhad (1)
  Saeed Pourmahdian (1)
  
  1. Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, 15914, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Condensed Matter Physics
  Industrial Chemistry and Chemical Engineering
  Polymer Sciences
  Characterization and Evaluation of Materials
  
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
• ISSN：1439-6203

文摘

Two novel heterogeneous nickel α-diimine based polymerization catalysts, containing MWCNT as the main ligand, were synthesized by novel in situ catalyst preparation technique. The in situ synthesis was performed by covalent attachment of the acenaphthenic ligand core to amine functionalized MWCNT ligand arms through diimine bonding and further nickel dibromide chelation. The prepared catalysts were fully characterized and their structures and supporting efficiencies were determined. Single or double introduction of the MWCNTs through their ends or sidewall(s) in the catalytic system, as a ligand, influenced the catalytic performance, microstructure and morphology of obtained polyethylenes. MWCNT sidewall bonding to para-aryl position of the tetramethylphenyl moiety performed as more electron-donating ligand than MWCNT ends linked to the imine bond and protected the catalytic system to retain its activity. This character resulted in the maintenance of the resulting polymer topology at elevated temperatures so that the catalytic activity and the obtained polymer melting points remained around 110 g PE?mmol? Ni?h? and 123 °C in all polymerization temperatures respectively. In polymerization trials, molecular weight fall against temperature was not as sharp as what had been observed in sequentially prepared catalysts insofar as the molecular weight of resultant polymer at 60 °C reached to 310000 g?mol? which was close to the highest value had been reported at 30 °C for sequentially prepared catalysts. TEM observations showed the presence of the stopped-growth polymer chains due to geometrical constrains or ligand debonding for both catalytic systems.