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Method for producing verelite with [O,N] type catalyst of bidentate ligand coordinated with post-transition metal

A late-transition metal and bidentate ligand technology, applied in the chemical industry, can solve the problems of lack of stereoregularity and limit the use of polystyrene, and achieve good catalytic activity

Inactive Publication Date: 2008-08-20
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the polystyrene on the market is produced by free radical polymerization. The polystyrene produced in this way is a random polymer and lacks stereoregularity, which limits the use of polystyrene.

Method used

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  • Method for producing verelite with [O,N] type catalyst of bidentate ligand coordinated with post-transition metal
  • Method for producing verelite with [O,N] type catalyst of bidentate ligand coordinated with post-transition metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Preparation of Ligand 7-hydroxyindan-1-(N-phenylimine)

[0022] in N 2 Next, 1.68g (11.4mmol) of 7-hydroxyindanone and 1.4mL (15.0mmol) of aniline were added to a 100mL three-necked flask, and then 30mL of absolute ethanol, 0.1mL of formic acid, and 0.7g of 4A molecular sieves were added. Heat to reflux for 48 hours. After the end of the reaction, filter, collect the filtrate, and use anhydrous Mg 2 SO 4 It was dried, concentrated, and passed through a silica gel column using a mixed solution of petroleum ether and ethyl acetate as an eluent to obtain 1.53 g of an orange oil with a yield of 60%.

Embodiment 2

[0023] Example 2 Preparation of Ligand 7-hydroxy-3,4-dimethyl-6-tert-butylindan-1-(N-phenylimine)

[0024] in N 2 1.3mL (11.4mmol) TiCl will be dissolved within 30min 4 30mL of toluene solution was added to 40mL of toluene solution containing 4.3mL (45.4mmol) aniline. Then the reaction mixture was heated to 90° C., and 2.63 g (11.4 mmol) of 7-hydroxy-3,4-dimethyl-6-tert-butylindanone was added after 30 min. At this temperature, the reaction was carried out for 48 hours. After the reaction, the reaction solution was poured into Na 2 CO 3 Saturated aqueous solution, liquid separation, organic phase with anhydrous Mg 2 SO 4 It was dried, concentrated, and passed through a silica gel column using a mixed solution of petroleum ether and ethyl acetate as an eluent to obtain 2.75 g of an orange-red solid with a yield of 45%.

Embodiment 3

[0025] The preparation of the catalyst of embodiment 3 and metal Ni coordination

[0026] 0.122g (0.49mmol) of Ni(OAc) 2 4H 2 O and 0.327g (0.98mmol) of 7-hydroxy-3,4-dimethylindan-1-(N-2,6-diisopropylphenylimine) were added to 20mL of absolute ethanol, and heated to reflux for 3 hours. After cooling, the solid was collected by filtration and dried under vacuum. 0.236 g of a tan solid was obtained with a yield of 75%.

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Abstract

The invention pertains to the field of chemical technology, which more particularly relates to a catalyst preparation method of Polystyrene by coordinating an (O, N) type of bidentate ligand and a transition metal. The catalyst system consists of ingredient A and B, wherein, the expression for the ingredient A is L 2 M, L represents the bidentate ligand of O and N hetero atom which can be coordinated with late transition metal, M represents the late transition metal Ni and Cu with the valence of +2; the ingredient B represents methylaluminoxane or modified methylaluminoxane. The preparation method for preparing the ingredient A in the invention is easy and is stable for air. The catalyst system which consists of ingredient A and ingredient B can catalyze the coordination polymerization of styrene with high activity, thus obtaining a random polymer with higher molecular weight, but the content of isotactic triple (mm) in the catalyst system can reach 80 percent.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing polystyrene by using a catalyst coordination polymerization mode in which a type of [O, N] type bidentate ligand coordinates with a late transition metal. Background technique [0002] Polystyrene is one of the five general-purpose thermoplastic synthetic resins. At present, polystyrene is mainly used in the electronics and electrical appliances industry, followed by small commodities for daily use, as well as the packaging industry and the construction industry. [0003] Styrene can be polymerized by all chain reactions, including: free radical polymerization, anionic polymerization, cationic polymerization and coordination polymerization. Most of the polystyrene on the market is produced by free radical polymerization. The polystyrene produced in this way is a random polymer, lacking stereoregularity, which limits the use of polysty...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F4/70C08F4/54
Inventor 金国新汤光荣
Owner FUDAN UNIV
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