Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization

2018 ◽  
Vol 47 (38) ◽  
pp. 13459-13465 ◽  
Author(s):  
Quande Zheng ◽  
Dejuan Zheng ◽  
Binghao Han ◽  
Shaofeng Liu ◽  
Zhibo Li
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Chromium Complexes ◽  
Highly Active ◽  
Imine Ligands

Chromium complexes bearing phosphine–imine ligands are highly active for ethylene polymerization and produce HDPE with a high molecular weight.

Highly active self-immobilized FI-Zr catalysts in a PCP framework for ethylene polymerization

2015 ◽  
Vol 51 (93) ◽  
pp. 16703-16706 ◽  
Author(s):  
He Li ◽  
Bo Xu ◽  
Jianghao He ◽  
Xiaoming Liu ◽  
Wei Gao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Ethylene Polymerization ◽  
Highly Active ◽  
Catalytic Performances

FI catalysts in PCPs show good catalytic performances and produce high molecular weight polyethylenes with bimodal molecular weight distribution.

Ethylene Polymerization by Thioether Bridged Dinuclear Titanocene Complex

2011 ◽  
Vol 213 ◽  
pp. 354-357 ◽  
Author(s):  
Yu Jing Nie ◽  
Ming Yang
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
Ethylene Polymerization ◽  
Gel Permeation Chromatography ◽  
Molar Ratio ◽  
Polymerization Temperature ◽  
High Concentration ◽  
Highly Active ◽  
Cyclopentadienyl Ligand ◽  
Broad Molecular Weight Distribution

The thioether bridged metallocene complex [(C5H5)Cl2TiC5H4CH2CH2]2S has been synthesized by treating the dilithium salts of the thioether bridged cyclopentadienyl ligand with two equivalents of C5H5TiCl3 and characterized by 1HMNR and elemental analysis. After activation with methylaluminoxane (MAO), the complex was highly active catalysts for homogeneous ethylene polymerization in toluene. The influence of the molar ratio [MAO]/[Cat], the catalyst concentration, time and temperature have been studied systematically. The catalytic activity of 1 is 3.63×105 g PE/mol•Cat•h. Rising the polymerization temperature decreases the catalytic activity for 1. A high concentration of the catalysts drops the catalytic activity as well as the molecular weight of polyethylene for the complex. High temperature gel permeation chromatography (HT-GPC) proves the production of polyethylene with a broad molecular weight distribution (MWD).

scholarly journals Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst

2017 ◽  
Vol 8 (41) ◽  
pp. 6416-6430 ◽  
Author(s):  
Qaiser Mahmood ◽  
Yanning Zeng ◽  
Erlin Yue ◽  
Gregory A. Solan ◽  
Tongling Liang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
High Molecular Weight ◽  
Nickel Catalyst ◽  
High Tensile Strength ◽  
Elongation At Break ◽  
Highly Active ◽  
High Elongation ◽  
Ultra High Molecular Weight ◽  
Shape Fixity

Highly active para-t-Bu-containing 1,2-bis(imino)acenaphthene-Ni(ii) catalysts are disclosed which afford hyper-branched PEs with Mw's up to 3.1 × 106 g mol−1; high tensile strength, excellent shape fixity as well as high elongation at break are a feature.

scholarly journals Enhancing thermostability of iron ethylene polymerization catalysts through N,N,N-chelation of doubly fused α,α′-bis(arylimino)-2,3:5,6-bis(hexamethylene)pyridines

2019 ◽  
Vol 9 (8) ◽  
pp. 1933-1943 ◽  
Author(s):  
Zheng Wang ◽  
Randi Zhang ◽  
Wenjuan Zhang ◽  
Gregory A. Solan ◽  
Qingbin Liu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
High Catalytic Activity ◽  
Polymerization Catalysts ◽  
Fe Catalyst

At temperatures up to 80 °C, high catalytic activity and high molecular weight PE was achievable using the Fe-catalyst depicted.

High molecular weight polyethylenes of narrow dispersity promoted using bis(arylimino)cyclohepta[b]pyridine-cobalt catalysts ortho-substituted with benzhydryl & cycloalkyl groups

2020 ◽  
Vol 49 (15) ◽  
pp. 4774-4784 ◽  
Author(s):  
Mingyang Han ◽  
Qiuyue Zhang ◽  
Ivan I. Oleynik ◽  
Hongyi Suo ◽  
Gregory A. Solan ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Cobalt Catalysts ◽  
One Pot ◽  
Molecular Weights ◽  
Highly Active

The depicted cobalt precatalysts, prepared using a one pot strategy, can form highly active catalysts at temperatures between 50 °C and 60 °C and can mediate the formation of linear PEs displaying high molecular weights and narrow dispersities.

Asymmetric bis-salicylaldiminato binuclear titanium complexes for ethylene polymerization and copolymerization

2021 ◽  
Author(s):  
Yawen Qin ◽  
Tingcheng Li ◽  
Xiong Chen ◽  
Jian Li ◽  
Xiang Meng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Ethylene Polymerization ◽  
Titanium Complexes ◽  
Broad Molecular Weight Distribution

Polyolefins with high molecular weight and broad molecular weight distribution have attracted great attention due to their ease of processing and wide applications. In this paper, methylene-bridged asymmetric disalicylaldimine ligands...

Advancing polyethylene properties by incorporating NO2 moiety in 1,2-bis(arylimino)acenaphthylnickel precatalysts: synthesis, characterization and ethylene polymerization

2017 ◽  
Vol 46 (21) ◽  
pp. 6934-6947 ◽  
Author(s):  
Qaiser Mahmood ◽  
Yanning Zeng ◽  
Xinxin Wang ◽  
Yang Sun ◽  
Wen-Hua Sun
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Ultra High Molecular Weight

A family of 1-(2,6-dibenzhydryl-4-nitrophenylimino)-2-aryliminoacenaphthylnickel halides, on activation with either Et2AlCl or EASC, produced ultra-high-molecular-weight highly branched polyethylenes.

scholarly journals From polyethylene waxes to HDPE using an α,α′-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl-chromium(iii) chloride pre-catalyst in ethylene polymerisation

2017 ◽  
Vol 46 (21) ◽  
pp. 6948-6957 ◽  
Author(s):  
Chuanbing Huang ◽  
Shizhen Du ◽  
Gregory A. Solan ◽  
Yang Sun ◽  
Wen-Hua Sun
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Co Catalyst ◽  
Catalytic Activities ◽  
Ethylene Polymerisation

Depending on the aluminium-alkyl co-catalyst employed, the title Cr(iii) chlorides can exhibit high catalytic activities in ethylene polymerization, producing either high molecular weight PE or linear PE waxes.

Sign in / Sign up

Export Citation Format

Share Document