A kind of catalyst system for preparing aliphatic polyester and the method for using it to catalyze the synthesis of aliphatic polyester

A technology of aliphatic polyester and synthesis method, which is applied in the field of catalyst system for preparing aliphatic polyester, can solve the problems of expensive metal pollutants, metal catalyst pollution, hindering the application of polyester, etc., so as to avoid the problem of metal residue, catalyze High efficiency, improve the possible effect of use

Active Publication Date: 2021-06-25
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal catalysts often cause corresponding pollution
Simultaneous removal of metal contaminants is costly and may hinder the application of these polyesters in packaging materials and biomedical devices
Copolymerization of epoxides and cyclic anhydrides via metal-free catalysts remains a key challenge today

Method used

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  • A kind of catalyst system for preparing aliphatic polyester and the method for using it to catalyze the synthesis of aliphatic polyester
  • A kind of catalyst system for preparing aliphatic polyester and the method for using it to catalyze the synthesis of aliphatic polyester
  • A kind of catalyst system for preparing aliphatic polyester and the method for using it to catalyze the synthesis of aliphatic polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.02 g of DBU ionic liquid and 4.28 g of succinic anhydride into the reaction flask, vacuumize for 15 min, then add 5 mL of tetrahydrofuran and 3 mL of propylene oxide, and react at 120 °C for 10 h; Dissolve and settle with n-hexane as a precipitating agent to obtain aliphatic polyester.

[0028] The proton nuclear magnetic spectrum of the aliphatic polyester that embodiment 1 makes ( 1 H-NMR, CDCl 3 ) figure, such as figure 1 shown. The successful preparation of polyester can be seen from the figure. This demonstrates the effectiveness of the metal-free catalytic system of the present invention for the copolymerization of epoxides and cyclic anhydrides.

[0029] Figure 1 to Figure 5 The meaning of all coordinates in ppm is Chemical Shift.

Embodiment 2

[0031] Add 0.05 g of DBU-based ionic liquid and 4.214 g of maleic anhydride into the reaction flask, vacuumize for 20 min, then add 5 mL of tetrahydrofuran and 3 mL of propylene oxide, and react at 80 °C for 8 h. After the reaction is completed, the reaction system is dissolved with chloroform and settled with n-hexane as a sedimentation agent to obtain an aliphatic polyester.

[0032] The proton nuclear magnetic spectrum of the aliphatic polyester that embodiment 2 makes ( 1 H-NMR, CDCl 3 ) figure, such as figure 2 shown. The successful preparation of polyester can be seen from the figure. This demonstrates the effectiveness of the metal-free catalytic system of the present invention for the copolymerization of epoxides and cyclic anhydrides.

Embodiment 3

[0034] Add 0.02 g of DBU-based ionic liquid and 6.364 g of phthalic anhydride into the reaction flask, vacuumize for 30 min, then add 5 mL of tetrahydrofuran and 3 mL of propylene oxide, and react at 100 °C for 10 h. After the reaction is completed, the reaction system is dissolved with chloroform and settled with n-hexane as a sedimentation agent to obtain an aliphatic polyester.

[0035] The proton nuclear magnetic spectrum of the aliphatic polyester that embodiment 3 makes ( 1 H-NMR, CDCl 3 ) figure, such as image 3 shown. The successful preparation of polyester can be seen from the figure. This demonstrates the effectiveness of the metal-free catalytic system of the present invention for the copolymerization of epoxides and cyclic anhydrides.

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Abstract

The invention discloses a catalyst system for preparing aliphatic polyester and a method for using it to catalyze the synthesis of aliphatic polyester. 2 1,8-diazabicycloundec-7-ene is reacted with organic carboxylic acid under protection and a certain temperature, and vacuum-dried to obtain a catalyst system for preparing aliphatic polyester; the catalyst system, cyclic acid anhydride 1. Organic solvent and epoxide react at a certain temperature, dissolve the reaction system with chloroform, and then use n-hexane as a sedimentation agent for sedimentation to obtain aliphatic polyester. The catalytic system has high catalytic efficiency, does not introduce any metal ions, avoids the metal residue problem caused by the traditional metal catalytic system, is green and environmentally friendly, and improves the possibility of using aliphatic polyester in the field of biomedicine.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis, and relates to a catalyst system for preparing aliphatic polyester; the invention also relates to a method for catalytically synthesizing various polymers by using the catalyst system. Background technique [0002] Aliphatic polyesters are considered as potential sustainable alternatives to petroleum-based polymers because of their numerous renewable resources, ease of hydrolytic degradation into typically benign products, and high biocompatibility. Therefore, it is widely used, especially in bulk-packaged biomedical devices. Typically, polyesters are prepared by step-growth and chain-growth polymerization strategies. Step growth polymerizations generally involve the reaction of diacids or diesters with diols. However, the reaction conditions are very harsh, such as high temperature, low pressure and long reaction time. Ring-opening copolymerization (ROCOP) of epoxides and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/87C08G63/42C08G63/58
CPCC08G63/42C08G63/58C08G63/87
Inventor 宋鹏飞陈亚伦王紫娟张宗莲于丽曹雪梅
Owner NORTHWEST NORMAL UNIVERSITY
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