Preparation method of degradation-controllable polypropylene carbonate

A polypropylene carbonate and reactor technology, applied in the field of polypropylene carbonate preparation, can solve the problems of increasing metal residues, low complete degradation temperature, affecting application, etc., and achieve the effect of good application space and narrowing degradation temperature range.

Pending Publication Date: 2022-03-11
NINGBO INST OF NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in some special application fields, in order to reduce the destructive effect of temperature on the processed substrate, the material is required to have a lower complete degradation temperature, and the degradation temperature can be reduced only by changing the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 100g of polypropylene carbonate with a weight-average molecular weight of 150,000 g / mol (the carbonate structure content is 99mol%) and place it in a 2L reactor, add 900mL of dichloromethane into the reactor, stir and dissolve at 30°C Then 0.1 g of tetraethylammonium bromide was added and stirring was continued for 1 hour.

[0015] The solution was vacuum-dried at 40° C. for 24 hours after the solvent was removed under reduced pressure to obtain the product S1.

Embodiment 2

[0017] Weigh 100 g of polypropylene carbonate with a weight average molecular weight of 200,000 g / mol (the content of carbonate structure is 99 mol %) and place it in a 2 L reactor, add 800 mL of dichloromethane into the reactor, and stir at 25 °C After dissolution, 0.5 g of tetrabutylammonium bromide was added, and stirring was continued for 1 hour.

[0018] The solution was vacuum-dried at 40° C. for 24 hours after the solvent was removed under reduced pressure to obtain the product S2.

Embodiment 3

[0020] Weigh 100 g of polypropylene carbonate with a weight average molecular weight of 500,000 g / mol (carbonate structure content of 99 mol %) and place it in a 2 L reactor, add 600 mL of toluene to the reactor, stir and dissolve at 30 °C 2 g of 1,5,7-triazabicyclo[4.4.0]dec-5-ene 4-dimethylaminopyridine were added and stirring was continued for 2 hours.

[0021] The solution was vacuum-dried at 40° C. for 24 hours after the solvent was removed under reduced pressure to obtain the product S3.

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Abstract

A preparation method of degradation-controllable polypropylene carbonate belongs to the technical field of high polymer materials and comprises the following steps: weighing 100g of polypropylene carbonate, putting the polypropylene carbonate into a reactor, adding 600-900ml of a solvent into the reactor, stirring and dissolving at 25-30 DEG C, adding 0.1-5g of an organic auxiliary agent which is an organic alkali or quaternary ammonium salt, continuously stirring for 1-5 hours, and then adding 0.1-5g of a catalyst into the reactor, and decompressing to remove the solvent, and drying in vacuum. According to the preparation method, the metal-free organic additive is introduced into the polypropylene carbonate, so that the accurate control of the thermal degradation temperature of the polypropylene carbonate is realized, the degradation temperature interval can be effectively reduced, the lowest degradation temperature can reach 170 DEG C, and the complete degradation temperature interval can be controlled to be reduced to 51 DEG C. As the non-metal organic auxiliary agent is used, the ash residue after the material is degraded is not increased in the preparation process, so that the material has a very good application space in the field of electronic products.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for preparing polypropylene carbonate with controllable degradation. Background technique [0002] Polypropylene carbonate is an aliphatic polycarbonate material, which is generally prepared by the copolymerization reaction of carbon dioxide and propylene oxide under the action of a catalyst. Because of the existence of carbonate bonds in the molecular chain, it has good degradation performance, and is an ideal biodegradable polymer material. It has good application potential in the fields of disposable packaging and plastic film, and helps to solve the current increasingly serious plastic pollution problem. [0003] In addition to the application in the field of biodegradation, polypropylene carbonate also has the characteristics of low thermal decomposition temperature, low heat of combustion and no residue in thermal decomposition, and can be us...

Claims

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Application Information

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IPC IPC(8): C08J11/28C08L69/00
CPCC08J11/28C08J2369/00Y02W30/62
Inventor 刘振国秦玉升陈妍慧杨梦晶
Owner NINGBO INST OF NORTHWESTERN POLYTECHNICAL UNIV
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