Method for preparing polyester by ring-opening polymerization

A technology of ring-opening polymerization and polyester, applied in the field of organometallic catalyzed polymer materials, can solve problems such as being unsuitable for industrial production

Active Publication Date: 2017-08-08
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, they are very sensitive to air and water, and the harsh conditions are not suitable for industrial production.

Method used

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  • Method for preparing polyester by ring-opening polymerization
  • Method for preparing polyester by ring-opening polymerization
  • Method for preparing polyester by ring-opening polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] In a 10mL polymerization tube, add L-lactide (0.432g, 3mmol), compound (1) (0.022g, 0.1mmol), phenylpropanol (13.5μL, 0.1mmol), and stir magnetically at 130°C After 24 hours, the reaction was stopped, and a small amount of dichloromethane was added dropwise to the resulting mixture to dissolve, and then the resulting solution was slowly dropped into cold methanol, and a white polymer was precipitated. After centrifugation and vacuum drying, 0.38 g of the product was obtained, and the conversion rate was 98.7%. Number average molecular weight M of poly L-lactide n It is 4560g / mol, and the molecular weight distribution PDI is 1.18. (attached figure 1 , 2 )

Embodiment 2

[0074] In a 10mL polymerization tube, add D-lactide (0.432g, 3mmol), compound (8) (0.027g, 0.1mmol), pentaerythritol (9.7μL, 0.1mmol), and stir magnetically at 130°C for 20 hours , stop the reaction, drop a small amount of dichloromethane into the resulting mixture to dissolve, then slowly drop the resulting solution into cold methanol, a white polymer is precipitated, and obtain 0.29g of the product through centrifugation and vacuum drying, with a conversion rate of 96.1%. - Number average molecular weight M of lactide n It is 4610 g / mol, and the molecular weight distribution PDI is 1.19.

Embodiment 3

[0076] In a 10mL polymerization tube, add L-lactide (0.432g, 3mmol), compound (9) (0.058g, 0.1mmol), benzyl alcohol (10.0μL, 0.1mmol), and stir magnetically at 130°C for 18 After hours, the reaction was stopped, and a small amount of dichloromethane was added dropwise to dissolve the resulting mixture, and then the resulting solution was slowly dripped into cold methanol, and a white polymer was precipitated. After centrifugation and vacuum drying, 0.36g of the product was obtained, and the conversion rate was 98.4%. Number average molecular weight M of L-lactide n It is 4710g / mol, and the molecular weight distribution PDI is 1.18.

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Abstract

The invention discloses a method for preparing polyester by ring-opening polymerization and belongs to the technical field of organic metal catalyzed high molecular materials. The method comprises the following steps: (1) combining organic phosphate and a metallic compound through an ion bond to obtain organic phosphate metallic salt; (2) under a reaction condition, carrying out dual-activation on a cyclic monomer and an initiator by utilizing the organic phosphate metallic salt; (3) catalyzing the cyclic monomer by the organic phosphate metallic salt to be subjected to the ring-opening polymerization in the presence of an alcohol type initiator, so as to obtain the polyester. The method disclosed by the invention has the advantages of simple and convenient process, low cost, high reaction speed, controllable process and narrow molecular weight distribution.

Description

technical field [0001] The invention belongs to the technical field of organometallic catalytic polymer materials, in particular to a method for catalyzing ring-opening polymerization of cyclic compounds. 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 temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/87C08G63/08C08G64/30
Inventor 郭凯陈思明李振江王海鑫魏福兰朱慧高宇
Owner NANJING UNIV OF TECH
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