Single site catalyst for synthesizing polycarbonate

A polycarbonate and catalyst technology, applied in the field of high-activity single-active-site catalysts, can solve the problems of high pressure, low catalyst activity, and long reaction time, and achieve the effects of mild reaction conditions, high catalyst activity, and high catalytic activity.

Active Publication Date: 2009-04-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application numbers: CN 89100701.6 and CN 91109459.8 disclose a bimetallic catalyst system supported by polymers with anion coordination, and can also obtain 10 4 Catalytic efficiency in grams of polymer per mole of catalyst, but the support is difficult to separate from the resulting polycarbonate
[0004] Most of the above-mentioned methods for preparing polycarb

Method used

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  • Single site catalyst for synthesizing polycarbonate
  • Single site catalyst for synthesizing polycarbonate
  • Single site catalyst for synthesizing polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a stainless steel autoclave with an effective volume of 200ml, add in the following order at ambient temperature: 0.1 mmol of tetradentate Schiff base cobalt complex (R 1 is cyclohexanediamine, X is a nitrate anion; R 2 = H; R 3 , R 4 , R 5 Both are tert-butyl groups; the organic base group is at the 3-position of a benzene ring of the ligand; n is 2) and 1 mole of propylene oxide, and then carbon dioxide gas is introduced and a constant pressure of 2.0 MPa is maintained. Control the temperature at 25°C, react under magnetic stirring for 6 hours, slowly release unreacted carbon dioxide in the autoclave, collect unreacted propylene oxide in a cold trap at -20°C, and then add a certain amount of methanol / chloroform mixture The polymer was dissolved, and then a large amount of ether was added to precipitate polycarbonate. It was filtered, washed several times with diethyl ether, and vacuum-dried to constant weight to obtain 27 g of polypropylene carbonate as a white...

Embodiment 2

[0039] In the same equipment used in Example 1, using the same catalyst, under the same conditions, only the mol ratio of catalyst to propylene oxide was increased from 1:10000 to 1:50000 (using 0.02 mmol catalyst and 1 mole Propylene oxide). After reacting at 25° C. for 24 hours, 21 grams of polypropylene carbonate was obtained, the molecular weight was 223,000, the molecular weight distribution was 1.29, and the carbonate units in the polymer exceeded 99%.

Embodiment 3

[0041] In the same equipment used in Example 1, using the same catalyst, under the same conditions, only the mol ratio of the catalyst to propylene oxide was increased from 1:10000 to 1:200000 (using 0.008 mmol of catalyst and 1.6 mole Propylene oxide). After reacting at 50° C. for 10 hours, 19 grams of polypropylene carbonate was obtained, the molecular weight was 318,000, the molecular weight distribution was 1.37, and the carbonate units in the polymer exceeded 99%.

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Abstract

The invention discloses a high-activity catalyst which catalyzing and activating carbon dioxide to perform the copolymerization reaction with alkylene oxide to synthesize polycarbonate. The catalyst is characterized in that the catalyst is a tetradentate schiff base complex contains one or two organic base groups and has single active site initiation and controllable polymerization. The catalyst has the advantages that under milder conditions and at lower concentration of the catalyst, the catalyst can highly and efficiently catalyze the carbon dioxide to make the copolymerization reaction with the alkylene oxide to prepare the polycarbonate, the catalytic efficiency is 10<6>g polymer/mol catalyst, the polymer molecular weight is adjusted in the range of between 5,000 and 500,000, the molecular weight distribution is less than 2, the alternating structure is over 97 percent, and the catalyst can be degraded into small molecule compounds under certain condition. By utilizing the catalyst, the telomerization reaction between the carbon dioxide and two or more than two types of alkylene oxide can be catalyzed to synthesize a polycarbonate telomer with adjusting glass transition temperature.

Description

technical field [0001] The invention relates to a catalyst for synthesizing polycarbonate, in particular to a high-activity single-active point catalyst for synthesizing polycarbonate by catalytically activating carbon dioxide and alkylene oxide. Background technique [0002] Carbon dioxide is the main gas that causes the greenhouse effect, and it is also one of the most abundant carbon sources on earth. The chemical fixation of carbon dioxide is an important research field of green chemistry. Under the action of catalyst, carbon dioxide can be copolymerized with alkylene oxide to prepare biodegradable polycarbonate. The high polymer has excellent oxygen and water barrier properties, and can be used as engineering plastics, biodegradable non-polluting materials, disposable medicine and food packaging materials, adhesives and composite materials, etc. [0003] At present, there are many patent reports on the preparation of polycarbonate by copolymerization of carbon dioxide...

Claims

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Application Information

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IPC IPC(8): C08G64/34
Inventor 吕小兵任伟民刘忠文
Owner DALIAN UNIV OF TECH
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