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Updated: Sep 9, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
Published on: November 27, 2015
Controlled chain-walking ethylene oligomerization in the gas-phase for hyperbranched ethylene oligomers
Jun Gan1, Dong-Yang Zhang1, Shengyu Dai1
1Anhui Laboratory of Molecule-Based Materials, Key Laboratory of Functional Molecular Solids, Ministry of Education, School of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, China. daiyu@ustc.edu.cn.
None:
Gas-phase polymerization is typically employed for the synthesis of high-molecular-weight crystalline polyolefin materials, yet the production of low-molecular-weight hyperbranched ethylene oligomers via this method is seldom reported. In this study, we utilized flexible bulky iminopyridyl Pd(II) catalysts to catalyze the gas-phase oligomerization of ethylene, resulting in the preparation of hyperbranched ethylene oligomers. These catalysts demonstrated higher activity and stability comparable to those observed in solution polymerization, yielding hyperbranched ethylene oligomers with lower branching density and higher molecular weights. Most notably, 13C NMR analysis and viscosity measurements revealed that these hyperbranched ethylene oligomers fulfill the requirements for application as a low-viscosity lubricating base.
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