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Method for improving thermal stability of polycarbonate

A technology of polycarbonate and thermal stability, applied in the field of environmentally friendly polymer materials, can solve the problems of poor thermal stability, complicated operation, limited application and development, etc., and achieve the effect of improving thermal stability and high weight loss temperature

Active Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can play a certain role, the effect is not significant, and the operation is more complicated, which cannot fundamentally solve the effect of residual catalyst on the accelerated decomposition of polycarbonate
[0006] In summary, polycarbonate has excellent performance, wide application, and important research value, but its poor thermal stability limits its application and development. Therefore, simple and effective methods are needed to improve the thermal stability of polycarbonate

Method used

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  • Method for improving thermal stability of polycarbonate
  • Method for improving thermal stability of polycarbonate
  • Method for improving thermal stability of polycarbonate

Examples

Experimental program
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Effect test

preparation example Construction

[0044] The preparation of the polycarbonate PECHC: first place the dried 300mL autoclave in an ice-water bath to cool, then add the freshly prepared catalyst into the autoclave, and after the temperature in the autoclave drops below 10°C, then Add 20mL CHO and 5mLEO respectively. Tighten the autoclave and feed CO 2 The air in the kettle was discharged, and then the autoclave was heated in an oil bath, adjusted to an appropriate pressure, and magnetic stirring was continued at a speed of 1000 rpm. After reacting for a certain period of time, the autoclave was taken out, cooled in an ice-water bath, and the pressure was slowly released to normal pressure. Anhydrous methanol was added to terminate the reaction, and then the product was dissolved with dichloromethane and precipitated with anhydrous methanol. The resulting polymer was vacuum dried at 50°C to constant weight.

[0045] Said purification method: After the newly prepared poly(ethylene cyclohexene carbonate) is compl...

Embodiment 1

[0051] Take 10g of PECHC, dissolve it completely with dichloromethane, and slowly pour it into the 5% dilute hydrochloric acid-methanol solution just prepared. The volume ratio of dichloromethane to dilute hydrochloric acid-methanol solution is 1:5. And keep stirring at a constant speed in the same direction. After the PECHC precipitation is complete, use a circulating water pump to perform suction filtration to remove the filtrate, and dry the obtained PECHC for the determination of the thermogravimetric reduction temperature.

Embodiment 2

[0053] Take 10g of the same PECHC as in Example 1, dissolve it completely in dichloromethane, and slowly pour it into the newly prepared 5% dilute hydrochloric acid-ethanol solution, the volume ratio of dichloromethane to dilute hydrochloric acid-ethanol solution is 1:5 , during the pouring process and keep stirring in the same direction at a constant speed. After the PECHC precipitation is complete, use a circulating water pump to perform suction filtration to remove the filtrate, and dry the obtained PECHC for the determination of the thermogravimetric reduction temperature.

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Abstract

The invention relates to a method for improving the thermal stability of polycarbonate. The method comprises the step of treating polycarbonate by adopting a mixed solution of inorganic acid and monohydric alcohol. According to the method provided by the invention, the polycarbonate is purified by using the mixed solution of inorganic acid and monohydric alcohol, so that the catalyst and the small molecular polymer remained in the polycarbonate are removed, the accelerated degradation effect of the residual catalyst on the polycarbonate can be effectively inhibited, and the purpose of improving the thermal stability of the polycarbonate is achieved.

Description

technical field [0001] The invention belongs to the technical field of environment-friendly polymer materials, and in particular relates to a method for improving the thermal stability of polycarbonate. Background technique [0002] carbon dioxide (CO 2 ) as a common by-product of the petrochemical industry is rich in resources, cheap and easy to obtain, stable and safe, and is an ideal raw material for chemical C1 synthesis, and CO 2 Excessive discharge of CO may easily cause environmental pollution, so the effective use of CO 2 Reducing emissions is thus becoming even more important today. Since the first use of CO by Inoue et al. in 1969 2 Since aliphatic polycarbonate (APC) was copolymerized with propylene oxide (PO), the research on the copolymerization of CO2 and epoxide has attracted extensive attention. [0003] The presence of the soft segment in APC makes it more flexible, while the presence of the carbonyl group enhances the rigidity of APC, and the ester grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/40
CPCC08G64/406
Inventor 谢京燕何明阳刘振宇钱俊峰崔爱军梁胜彪陈群王伟哲陈雄华刘国禹
Owner CHINA PETROLEUM & CHEM CORP
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