Search

A series of unsymmetrical 1‐[2,6‐bis(bis(4‐fluorophenyl)methyl)‐4‐MeOC6H2N]‐2‐aryliminoacenaphthene‐nickel(II) halides has been synthesized and fully characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance (1H NMR), 13C NMR, and 19F NMR spectroscopy as well as elemental analysis. The structures of Ni1 and Ni6 have been confirmed by the single‐crystal X‐ray diffraction. On activation with cocatalysts either ethylaluminum sesquichloride or methylaluminoxane, all the title nickel complexes display high activities toward ethylene polymerization up to 16.14 × 106 g polyethylene (PE) mol−1(Ni) h−1 at 30 °C, affording PEs with both high branches (up to 103 branches/1000 carbons) and molecular weight (1.12 × 106 g mol−1) as well as narrow molecular weight distribution. High branching content of PE can be confirmed by high temperature 13C NMR spectroscopy and differential scanning calorimetry. In addition, the PE exhibited remarkable property of thermoplastic elastomers (TPEs) with high tensile strength (σb = 21.7 MPa) and elongation at break (εb = 937%) as well as elastic recovery (up to 85%), indicating a better alternative to commercial TPEs. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 130–145 On activation with ethylaluminum sesquichloride and methylaluminoxane, the title complexes exhibit high activity in ethylene polymerization producing highly branched and high‐molecular‐weight polyethylenes (PEs); these PEs perform the property of thermoplastic elastomers (TPEs) with high tensile strength and elongation at break as well as elastic recovery. [ABSTRACT FROM AUTHOR]

ABSTRACT A series of 2-(arylimino)benzylidene-9-arylimino-5,6,7,8-tetrahydrocyclohepta [b]pyridyliron(II) chlorides was synthesized and characterized using FT-IR and elemental analysis, and the molecular structures of complexes Fe3 and Fe4 have been confirmed by the single-crystal X-ray diffraction as a pseudo-square-pyramidal or distorted trigonal-bipyramidal geometry around the iron core. On activation with methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), all iron precatalysts exhibited high activities toward ethylene polymerization with a marvelous thermo-stability and long lifetime. The Fe4/MAO system showed highest activity of 1.56 × 107 gPE·mol−1(Fe)·h−1 at 70 °C, which is one of the highest activities toward ethylene polymerization by iron precatalysts. Even up to 80 °C, Fe3/MAO system still persist high activity as 6.87 × 106 g(PE)·mol−1(Fe)·h−1, demonstrating remarkable thermal stability for industrial polymerizations (80-100 °C). This was mainly attributing to the phenyl modification of the framework of the iron precatalysts. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 830-842 [ABSTRACT FROM AUTHOR]

ABSTRACT A series of 1,2-bis(arylimino)acenaphthylenes ( L1- L5) was synthesized and reacted with CoCl2 to afford the corresponding cobalt complexes LCoCl2 ( C1- C5). All cobalt complexes have been fully characterized and in the case of C1 by single crystal X-ray diffraction; its molecular structure reveals a distorted tetrahedral geometry. On activation with AlEtCl2, C1- C5 efficiently polymerize isoprene to give polyisoprenes (PIs) with high contents of cis-1,4 units (between 90% and 94%). The influence of reaction temperature and [Al]/[Co] molar ratio on both catalytic performance and the microstructural properties of the PIs is investigated. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 3609-3615. [ABSTRACT FROM AUTHOR]