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Method for preparing degradable copolyester by trinary reactivity blending

A reactive and copolyester technology, which is applied in the field of ternary reactive blending to prepare degradable copolyesters. It can solve the problems of high price, limited application range of materials, poor mechanical and thermal properties, etc., and increase the molecular weight of polymers. , easy reaction operation and simple synthesis process

Inactive Publication Date: 2011-05-04
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The environmentally degradable materials currently researched are expensive, and their mechanical and thermal properties are inferior to those of traditional thermoplastics. These defects limit the application range of materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1 Add a certain proportion of 0.1 mmol D,L-oligolactic acid and 91.9 mmol polyethylene glycol in a nitrogen bottle, heat at 100°C for 2 hours, then raise the temperature to 200°C, keep for 2 hours, and keep at 200°C, Vacuuming for 2 h gave the reactive blend required for the experiment. Add 8 mmol polybutylene terephthalate, oligomeric lactic acid and polyethylene glycol copolymer into the flame-dried three-necked flask. The reaction was heated to 110°C, during the heating process, a vacuum was drawn for a period of time, and then N 2 , This process is repeated 5-6 times. Pass N at 110°C 2 , keep for 1 hour. Then heated to 260°C, vacuumed, and the reaction was maintained for 1.5 hours. Stop heating, cool down after the reaction stops, add to chloroform solution to dissolve, and then pour the solution into a large amount of methanol to obtain a white polymer precipitate. The filtrate was dried under vacuum at 40°C.

Embodiment 2

[0009] Example 2 Add a certain proportion of 29.9 mmol D,L-oligolactic acid and 0.1 mmol polyethylene glycol in a nitrogen bottle, heat at 100°C for 2 hours, then raise the temperature to 200°C, keep for 2 hours, and keep at 200°C, Vacuuming for 2 h gave the reactive blend required for the experiment. Add 70 mmol polybutylene terephthalate, oligomeric lactic acid and polyethylene glycol copolymer into the flame-dried three-necked bottle. The reaction was heated to 110°C, during the heating process, a vacuum was drawn for a period of time, and then N 2 , This process is repeated 5-6 times. Pass N at 110°C 2 , keep for 1 hour. Then heated to 260°C, vacuumed, and the reaction was maintained for 1.5 hours. Stop heating, cool down after the reaction stops, add to chloroform solution to dissolve, and then pour the solution into a large amount of methanol to obtain a white polymer precipitate. The filtrate was dried under vacuum at 40°C.

[0010] Result analysis

[0011] Copol...

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PUM

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Abstract

Disclosed is a method of preparing a degradable copolyester by means of ternary reactive blend. The present aliphatic polyester and diol have a reactive blend, then have a melting state transesterification reaction with aromatic polyester to generate degradable fat / aromatic copolyester. The invention has the advantages that the aliphatic polyester is inserted into the aromatic polyester effectively, the molecular weight of the polymer can be improved, and the copolyester is given with the degradation performance. The invention does not use any catalyst during the synthesis, and has the advantages of simple synthesis process, easy reaction operation and cheap and available raw materials. The copolyester either has certain of mechanical property or certain of degradation property.

Description

technical field [0001] The invention relates to a method for preparing degradable copolyester by three-way reactive blending, in particular to a three-way reactive blending method for reactive blending of aromatic polyester, aliphatic polyester and diol to prepare degradable copolyester. Method for degrading copolyesters. Background technique [0002] In recent years, people have paid more and more attention to the surrounding living environment, and environmentally friendly materials have been developed rapidly. Environmentally degradable polyesters have shown excellent performance in terms of mechanics and biodegradation. At present, many materials have been used to make degradable sutures, bone fixation materials, mulch, beverage bottles, etc. At present, many new biodegradable materials have been researched and developed, such as polylactide, polyglycolide, polycaprolactone, polyamino acid, polyanhydride and so on. The environmentally degradable materials currently res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/183C08G63/08
Inventor 陈义旺朱祥军吴立传黄笔武
Owner NANCHANG UNIV