Formation of branched polyethylenes by ethylene homopolymerization using LNiBr2 homo- and heterogeneous precatalysts: Interpretation of the polymer structures in comparison with commercial LLDPE

Mikhail A. Matsko, Nina V. Semikolenova, Vladimir A. Zakharov, Igor E. Soshnikov, Inna K. Shundrina, Wen Hua Sun

Research output: Contribution to journalArticlepeer-review

Abstract

Comparative data on the micro-structures and properties of branched polyethylenes (BPE) produced via ethylene homopolymerization over homogeneous N,N-α-diimine LNiBr2 complexes with different ligand composition (AlEt2Cl as a cocatalyst) and corresponding supported catalysts LNiBr2/SiO2(Al) (Al[iso-Bu]3 as a cocatalyst) are presented. Noticeable differences were observed between micro-structures of BPEs obtained using homo- and heterogeneous LNiBr2 complexes as catalysts. Supported catalysts produce BPEs with the majority of methyl branches (17–18 CH3(1000 C)−1 characterized by different molecular masses (1800–210 kg mol−1) and molecular weight distributions (Mw[Mn]1 = 5.9 and 2.6). Thermal and mechanical properties of these BPE samples obtained over supported Ni catalysts are similar to those of commercial LLDPE samples prepared with metallocene and Ziegler-Natta catalysts.

Original languageEnglish
Article number50436
Number of pages13
JournalJournal of Applied Polymer Science
Volume138
Issue number20
Early online date6 Jan 2021
DOIs
Publication statusPublished - 20 May 2021

Keywords

  • catalysts
  • mechanical properties
  • polyolefins
  • structure-property relationships
  • thermal properties
  • structure&#8208
  • ALPHA-OLEFINS
  • MOLECULAR-WEIGHT
  • COMPLEXES
  • property relationships
  • COMONOMER
  • DICHLORIDES
  • ZIEGLER-NATTA CATALYSTS
  • METALLOCENE
  • COPOLYMERIZATION

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