Catalyst composite and method for preparing polycarbonate

A technology of polycarbonate and composition, which is applied in the field of preparation of catalyst composition and polycarbonate, and can solve the problems of low catalytic activity and catalytic efficiency, poor control of polymer molecular weight, etc.

Active Publication Date: 2012-11-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic activity and catalytic efficiency of the above-mentioned metal complexes to functionalized cyclic carbonates are low, and the molecular weight of the polymer cannot be well controlled.

Method used

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  • Catalyst composite and method for preparing polycarbonate
  • Catalyst composite and method for preparing polycarbonate
  • Catalyst composite and method for preparing polycarbonate

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preparation example Construction

[0061] The catalyst composition provided by the invention is applied to the preparation of polycarbonate, so that the molecular weight of the polycarbonate is well controllable, thereby improving the medical value of the polycarbonate. Therefore the invention provides a kind of preparation method of polycarbonate, comprising:

[0062] Under the action of the catalyst composition, the cyclocarbonate is polymerized in an organic solvent to obtain polycarbonate, the catalyst composition includes a rare earth metal complex and a hydroxyl compound having a structure of formula (I), and the rare earth metal The molar ratio of the complex to the hydroxyl compound is 1:1~500;

[0063]

[0064] Wherein, Ln is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium or ytterbium;

[0065] R 1 , R 2 , R 3 and R 4 each independently selected from hydrogen or C1~C10 alkyl;

[0066] R 5...

Embodiment 1

[0082] In the reactor, add 3.0g (14.52mmol) of 2,4-di-tert-butylaniline, 0.81ml (7.38mmol) of dimethylethylenediamine, 1.51ml (20.16mmol) of 36% formaldehyde in water, and 10ml of methanol . 80 ° C reflux reaction for 24h. After the reaction mixed solution was cooled to room temperature, the supernatant liquid was poured out, and the oily substance in the lower layer was crushed in 9 ml of hot methanol solution to obtain 3.09 g of white powder, that is, the ligand with the structure of formula (IV). In the glove box, under the condition of -30°C, dissolve 0.019g of the ligand with the structure of formula (IV) in 10ml of n-hexane, and add it dropwise to 0.181g of Y (CH 2 Si(CH 3 ) 3 ) 3 (THF) 2 , In 5ml of n-ethane solution, keep the condition at -30°C for 12h. Wash the precipitate with n-hexane at -30°C to obtain a rare earth metal complex with the structure of formula (II), wherein, Ln is yttrium, R1 , R 2 , R 3 and R 4 is tert-butyl, R 7 and R 8 is methyl, R 6 F...

Embodiment 2

[0084] At room temperature, add 40 μmol of rare earth metal complexes, 40 μmol of benzyl alcohol, and 10 mL of tetrahydrofuran into a 25 mL polymerization bottle that has been treated with anhydrous and oxygen-free treatment, and react the polymerization bottle at 20 ° C for 5 minutes, then add 20 mmol of functionalized cyclocarbonate monomer, Then, after the polymerization reaction at 20°C for 0.5h, add an ethanol solution of hydrochloric acid with a volume fraction of 10% to the polymerization bottle to terminate the reaction, pour the reaction solution into ethanol to settle, filter to obtain a white solid, and place the solid in a vacuum After drying at 40° C. for 48 hours in a drying oven, a functionalized polycarbonate with a net weight of 2.31 g was obtained. Adopt nuclear magnetic test to detect the conversion rate of functionalized cyclocarbonate monomer, the result shows that monomer conversion rate is 98%; Adopt GPC analysis to obtain the molecular weight M of functi...

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Abstract

The invention provides a catalyst composite. The catalyst composite comprises a hydroxyl compound and a rare-earth metal complex having a structure of a formula (I), wherein the molar ratio of the rare-earth metal complex and the hydroxyl compound is 1:(1-500). The invention also provides a method for preparing polycarbonate. The method comprises the step of performing polymerization reaction on cyclic carbonate in an organic solvent in the presence of a catalyst composite to prepare polycarbonate. According to the invention, the rare-earth metal complex is matched with the hydroxyl compound, and polymerization reaction is carried out on cyclic carbonate by using the catalyst so that a small quantity of rear-earth metal complex is adopted in the composite to effectively catalyze the polymerization of cyclic carbonate; and the catalyst composite is high in catalysis efficiency and catalysis activity.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst composition and a preparation method of polycarbonate. Background technique [0002] Polycarbonate is a high molecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it is mainly divided into three categories: aliphatic polycarbonate, aromatic polycarbonate, and aliphatic-aromatic polycarbonate. Among them, aliphatic polycarbonate is easy to degrade, and has the advantages of low toxicity and good biocompatibility, so aliphatic polycarbonate is currently a hot spot in the research of biomedical materials. [0003] There are three ways to prepare aliphatic polycarbonate: (1) polycondensation of diol and carbonate, or polycondensation of diol and chloroformate; (2) CO 2 Polymerization with epoxy compounds in the presence of organometallic catalysts; (3) Ring-opening polymerization of cyclic carbonates. The r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
Inventor 崔冬梅赵伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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