Catalytic system for preparing polyolefin material containing polar monomer

Abstract

The invention provides an olefin polymerization catalytic system composed of a transition metal compound with a specific structure and alkylaluminoxane. The catalytic system can be used to catalyze polymerization of alpha-alkene and polar substituent group carrying alkene so as to obtain a polyolefin material containing polar group. In the situation that polymerization activity is maintained, the polyolefin material containing high content of the polar monomer.

Description

technical field [0001] The invention belongs to the field of catalysis and olefin polymerization, and relates to a catalyst system for olefin polymerization composed of a transition metal compound with a specific structure and an alkyl aluminoxane. The catalyst system can catalyze α-olefins and olefins with polar substituents Olefins are copolymerized to obtain polyolefin materials containing polar groups. technical background [0002] Single-site transition metal catalysts for olefin polymerization have been a research hotspot in organometallic chemistry, catalysis, polymer chemistry, and materials science in recent decades. Using this type of catalyst, olefin polymers with uniform molecular weight distribution and chemical composition distribution can be obtained. At the same time, the molecular structure and molecular weight of the polymer can be highly controlled by adjusting the catalyst structure. Through single-site catalysts, olefin polymers that cannot be obtained ...

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Problems solved by technology

It can be seen from the literature that there are several problems in this direction at present: 1) Since the polar group close to the double bond is very easy to coordinate with the active center, resulting in deactivation of the catalyst, so in most research and development Among them, the co-monomers with polar groups for polymerization are all long-chain comonomers, that is, there are more carbon atoms between the olefin double bond and the polar group, so as to ensure that the polar group does not bring too much Activity loss; 2) Although a longer chain length polar monomer is used, the interaction between the polar group and the active center is still inevitable. Compared with the homopolymerization of α-olefin, α-olefin and polar monomer 3) Compared with the homopolymerization of α-olefin, the molecular weight of the polymer obtained by the copolymerization of α-olefin and polar monomer is also much lower

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