Preparation method of polyester

A technology of polyester and polyester, applied in the field of organic polymer materials, can solve the problems of fast catalysis speed and controllable molecular weight, and achieve the effects of fast catalysis speed, controllable molecular weight and easy operation

Active Publication Date: 2019-08-06
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalytic systems have high activity, these catalytic systems cannot achieve both fast catalytic speed and controllable molecular weight.

Method used

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  • Preparation method of polyester
  • Preparation method of polyester
  • Preparation method of polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In a 10 mL polymerization tube, add D-lactide (0.432 g, 3 mmol), compound (9) (0.109 g, 0.3 mmol), DMAP (13.5 μL, 0.1 mmol), pentaerythritol (9.7 μL, 0.1 mmol), Stir magnetically at 140°C for 4 hours, stop the reaction, add a small amount of dichloromethane dropwise to the resulting mixture to dissolve, then slowly drop the resulting solution into cold methanol, a white polymer precipitates, centrifuge and vacuum dry to obtain 0.28g of the product , the conversion rate was 97.2%, the number-average molecular weight Mn of poly-D-lactide was 4610 g / mol, and the molecular weight distribution PDI was 1.21.

Embodiment 2

[0066] In a 10 mL polymerization tube, add d-lactide (0.0432 g, 0.3 mmol), compound (3) (0.115 g, 0.3 mmol), DBU (15.0 μL, 0.1 mmol), pentaerythritol (9.7 μL, 0.1 mmol) , Stir magnetically for 5 hours at 40°C, stop the reaction, add a small amount of dichloromethane dropwise to the resulting mixture to dissolve, then slowly drop the resulting solution into cold methanol, a white polymer is precipitated, and the product 0.03 is obtained by centrifugation and vacuum drying. g, the conversion rate is 97.6%, the number average molecular weight M of poly d-lactide n It is 500 g / mol, and the molecular weight distribution PDI is 1.11.

Embodiment 3

[0068] In a 10 mL polymerization tube, add l-lactide (0.432 g, 3 mmol), compound (4) (0.109 g, 0.3 mmol), DBU (15.0 μL, 0.1 mmol), benzyl alcohol (10.0 μL, 0.1 mmol) , Stir magnetically for 1.5 hours at 130°C, stop the reaction, add a small amount of dichloromethane dropwise to the resulting mixture to dissolve, then slowly drop the resulting solution into cold methanol, a white polymer is precipitated, and the product 0.36 is obtained by centrifugation and vacuum drying. g, the conversion rate is 99.5%, the number average molecular weight M of poly-l-lactide n It is 5389 g / mol, and the molecular weight distribution PDI is 1.19. (attached figure 1 , 2 )

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Abstract

The invention belongs to the technical field of organic polymer materials, and particularly relates to a preparation method of polyester. In the presence of an initiator, thiourea with three hydrogenbonds or an amide catalyst and an alkali are used to catalyze ring-opening polymerization of a cyclic ester monomer to obtain polyester compound. The method has the advantages of simple process, low cost, high reaction rate, controllable process and narrow molecular weight distribution of the obtained product.

Description

technical field [0001] The invention belongs to the technical field of organic polymer materials, and in particular relates to a preparation method of polyester. Background technique [0002] Among many synthetic polymer materials, aliphatic polyester occupies an important position due to its excellent biodegradability, bioabsorbability and biocompatibility, and has become a research hotspot in recent years. Due to the easily hydrolyzed ester group in the molecular structure of this kind of polyester, it is easy to gradually decompose into oligomers or monomers in the presence of water and microorganisms, and then be metabolized into carbon dioxide and water, so it can show certain biodegradability. Compatibility, which has great application potential in biomedicine, tissue engineering and other fields. [0003] The traditional method of preparing polyester is mainly polycondensation method. This method usually requires high temperature, consumes a lot of energy, and the ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/87C08G64/02C08G64/30
CPCC08G63/08C08G63/823C08G64/0208C08G64/305
Inventor 郭凯李振江张磊罗子堃朱玥嘉姚志威
Owner NANJING UNIV OF TECH
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