Citation: Xu Sheng, Liang Chunchao, Lü Zhongwen, Zhu Yuling, Zhang Cui, Mi Puke. Study on the Influence of the Weak Effect of Benzyl Benzene Ring on the Polymerization Behavior of Ethylene[J]. Chinese Journal of Organic Chemistry, ;2017, 37(5): 1284-1289. doi: 10.6023/cjoc201701052 shu

Study on the Influence of the Weak Effect of Benzyl Benzene Ring on the Polymerization Behavior of Ethylene

School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237

Corresponding author: Xu Sheng, xusheng@ecust.edu.cn Mi Puke, pkm@ecust.edu.cn
Received Date: 27 January 2017
Revised Date: 27 March 2017

Fund Project: Project supported by the National Natural Science Foundation of China U1362111

Figures(4)

In order to study the effect of the benzyl benzene ring on the catalytic behavior of binuclear metallocene, the binuclear metallocene [μ, μ-1, 4-(CH₂)₂(C₆H₄)] [(η⁵-C₅H₅)TiCl₂(η⁵-(C₆H₅)C(Me)₂(C₅H₃)]₂ [(TiBz)₂] is synthesized and characterized by ¹H NMR, ¹³C NMR, mass spectra and elemental analysis. When combined with methylaluminoxane (MAO), the (TiBz)₂/MAO system catalyzed ethylene polymerization and the polymer with C(4) branch were obtained. It is suggested that the C(4) branch is from the ethylene trimerization by the weak effect between the benzyl and center metal. The (TiBz)₂/MAO system also showed great ability for ethylene copolymerization with 1-hexene and the incorporation of 1-hexene in polymer reached up to 13.7 mol%. The ¹³C NMR result of polymer showed that the polymer contained alternatively copolymerized HEHE fragment and the possible mechanism is presented for explaining the special catalytic behavior. It is the weak effect between the benzyl and center metal that led to the alternative insertion of ethylene and 1-hexene, and the narrow molecular weight distribution (PDI=2.23) meant that there could be a great synergistic effect between the two activate center metals in the polymerization process, which greatly increased the copolymerization capability.
- benzyl,
- binuclear metallocene,
- weak effect,
- copolymerization ability,
- mechanism
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