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Bifunctional bimetallic catalyst and application thereof

A bimetallic catalyst, bifunctional technology, applied in the field of efficient preparation, bifunctional bimetallic catalyst, can solve the problems of intramolecular transesterification side reaction, difficult to control polymerization reaction, low catalyst activity, etc., to achieve narrow molecular weight distribution, polymer Narrow molecular weight distribution and high catalyst activity

Inactive Publication Date: 2022-03-11
DALIAN UNIV OF TECH
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Problems solved by technology

For aliphatic polyesters copolymerized with alkylene oxide and cyclic anhydrides, large-scale commercial applications have not yet been realized (Chem.Rev.2016, 116, 15167), mainly because most catalytic systems have low catalyst activity and are prone to molecular formation at high temperatures. Intermittent or intramolecular transesterification side reactions make the polymerization difficult to control, wide molecular weight distribution and other problems

Method used

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  • Bifunctional bimetallic catalyst and application thereof
  • Bifunctional bimetallic catalyst and application thereof
  • Bifunctional bimetallic catalyst and application thereof

Examples

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Embodiment Construction

[0045] Synthesis of polycarbonate: 100mL stainless steel reaction kettle equipped with magnets was dried at 130°C for more than 2 hours, then vacuumized and cooled to room temperature before use. A certain amount of bifunctional bimetallic catalyst is dissolved in a calculated amount of alkylene oxide to form a homogeneous solution, and then the mixed solution is injected into the reactor, and the temperature is raised to the set temperature while continuously feeding carbon dioxide at a certain pressure. After reacting for a specified time under specified reaction conditions, stop the reaction and reduce the pressure. The reaction system is distilled to collect unreacted alkylene oxide. The distilled solid product was dissolved with dichloromethane / precipitated with methanol, the operation was repeated three times, washed, and dried in vacuo. Determination of polymer molecular weight and molecular weight distribution using gel chromatography column; application of Bruker-400...

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Abstract

The invention belongs to the technical field of preparation of fine chemical materials, and relates to a bifunctional bimetallic catalyst and application thereof, in particular to efficient preparation of degradable polycarbonate, polyester and poly (ester-carbonate) by catalyzing epoxyalkane to participate in copolymerization. The designed and synthesized catalyst containing'electrophilic-nucleophilic 'difunctional and bimetallic complex can be used for copolymerization or three-modulation polymerization of alkylene oxide and carbon dioxide or cyclic anhydride in a reaction temperature range of 25-150 DEG C, and polycarbonate, polyester and poly (ester-carbonate) are prepared with high activity and high selectivity. By adopting the multi-chiral bifunctional bimetallic catalyst, the corresponding chiral polymer can be obtained with high activity and high enantioselectivity. The method has the advantages of low catalyst consumption, high activity, easy control of molecular weight, narrow distribution, wide use temperature range, easy regulation of polymer structure, and industrial application value.

Description

technical field [0001] The invention belongs to the technical field of preparation of fine chemical materials, relates to a class of bifunctional bimetallic catalysts and applications thereof, and particularly relates to the preparation of degradable polycarbonate, polyester and poly(ester-carbonate) by catalyzing alkylene oxides to participate in copolymerization Efficient preparation. Background technique [0002] Polyolefins from petroleum resources are widely used due to their high quality and low price, with an annual output of hundreds of millions of tons. However, this type of synthetic material is difficult to degrade and is the main material causing white pollution in contemporary times. Therefore, the development of biodegradable polymers has attracted the attention of countries all over the world. Both the carbon dioxide-based polycarbonate based on alkylene oxide and the aliphatic polyester obtained by copolymerization with acid anhydride have good biodegradabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34C08G63/84C08G63/82C08G63/64
CPCC08G64/34C08G63/84C08G63/826C08G63/64C08G63/42
Inventor 吕小兵李宜宁任伟民
Owner DALIAN UNIV OF TECH
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