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

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

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.

Язык оригиналаанглийский
Номер статьи50436
Число страниц13
ЖурналJournal of Applied Polymer Science
Том138
Номер выпуска20
Ранняя дата в режиме онлайн6 янв 2021
DOI
СостояниеЭлектронная публикация перед печатью - 6 янв 2021

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