Citation: Heng Liao, Jie Gao, Liu Zhong, Hai-Yang Gao, Qing Wu. Regioselective Polymerizations of α-Olefins with an α-Diamine Nickel Catalyst[J]. Chinese Journal of Polymer Science, ;2019, 37(10): 959-965. doi: 10.1007/s10118-019-2227-y shu

Regioselective Polymerizations of α-Olefins with an α-Diamine Nickel Catalyst

School of Materials Science and Engineering, PCFM Lab, GD HPPC Lab, Sun Yat-sen University, Guangzhou 510275, China

Corresponding author: Hai-Yang Gao, gaohy@mail.sysu.edu.cn
Received Date: 6 December 2018
Revised Date: 1 January 2019
Available Online: 25 February 2019

Polymerizations of linear α-olefins (C_nH_2n, CH₂＝CH―R, R = C_n−2) catalyzed by early transition metals typically afford amorphous polymers with alkyl chains (C_n−2), while chain-straightening polymerizations of α-olefins with nickel-based catalysts produce semicrystalline polyolefins. Polymerizations of various α-olefins were carried out using an α-diamine nickel catalyst with a significantly distorted chelating ring. The influences of temperature, monomer concentration, and chain length of α-olefins on polyolefin microstructure were examined in detail. The α-diamine nickel catalyst realized highly regioselective 2,1-insertion of α-olefins regardless of reaction temperature and monomer concentration. Increased chain length of α-olefins led to the formation of more linear polyolefin. Semicrystalline polyolefins with high melting temperatures (T_m) were made from α-olefins through highly regioselective 2,1-insertion and precise chain-straightening.
- Nickel catalyst,
- α-Olefin,
- Polymerization,
- Regioselectivity,
- Chain walking
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沈阳化工大学材料科学与工程学院沈阳 110142