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Method for preparing polylactic acid stereocomplex through star copolymer

A technology of stereocomplexes and star copolymers, applied in the field of polymer materials

Inactive Publication Date: 2015-11-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of PLA itself needs to be further improved. For example, the poor heat resistance of PLA limits its application range, and the use of stereocomposite technology is the direction of developing heat-resistant PLA in recent years.

Method used

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  • Method for preparing polylactic acid stereocomplex through star copolymer
  • Method for preparing polylactic acid stereocomplex through star copolymer
  • Method for preparing polylactic acid stereocomplex through star copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 5.24g of 2,2-bis(bromomethyl)-1,3-propanediol and 13.00g of sodium azide, dissolve it in 150mL of dimethylformamide, react at 80°C for 48 hours, filter the product, and spin the filtrate to dryness. Vacuum drying to obtain 2,2-bis-azido-1,3-propanediol; take 0.166g of 2,2-bis-azido-1,3-propanediol, 10.09g of L-lactide, put them in a flask, add 0.028g Stannous octoate, protected by argon, reacted at 130°C for 24 hours, dissolved the product with dichloromethane as a solvent, precipitated 2 to 3 times in the precipitant ether, filtered, and dried the filter cake in vacuum to obtain Two-armed L-polylactic acid; take 0.07g of 3-butyn-1-ol and 5.05g of D-lactide, put them in a flask, add 0.028g of stannous octoate, protect them under argon, and react at 130°C for 24 hours. Dissolve the product with dichloromethane as a solvent, precipitate in diethyl ether as a precipitant for 2 to 3 times, filter, and dry the filter cake in vacuum to obtain D-polylactic acid with alkyn...

Embodiment 2

[0023] Take 4.20g of 2,2-bis(bromomethyl)-1,3-propanediol and 10.40g of sodium azide, dissolve it in 150mL of dimethylformamide, react at 80°C for 48 hours, filter the product, and spin the filtrate to dryness. Vacuum drying to obtain 2,2-bis-azido-1,3-propanediol; take 0.166g 2,2-bis-azido-1,3-propanediol, 12.11gL-lactide, put them in a flask, add 0.034g Stannous octoate, protected by argon, reacted at 130°C for 24 hours, dissolved the product with dichloromethane as a solvent, precipitated 2 to 3 times in the precipitant ether, filtered, and dried the filter cake in vacuum to obtain Two-arm L-polylactic acid; take 0.07g of 3-butyn-1-ol and 6.06g of D-lactide, put them in a flask, add 0.034g of stannous octoate, and react under argon protection for 24 hours at 130°C. Dissolve the product with dichloromethane as a solvent, precipitate in diethyl ether as a precipitant for 2 to 3 times, filter, and dry the filter cake in vacuum to obtain D-polylactic acid with alkynyl groups; t...

Embodiment 3

[0025]Take 5.24g of 2,2-bis(bromomethyl)-1,3-propanediol and 13.00g of sodium azide, dissolve it in 150mL of dimethylformamide, react at 80°C for 48 hours, filter the product, and spin the filtrate to dryness. Vacuum drying to obtain 2,2-bis-azido-1,3-propanediol; take 0.166g of 2,2-bis-azido-1,3-propanediol, 8.07g of L-lactide, put them in a flask, add 0.022g Stannous octoate, protected by argon, reacted at 130°C for 24 hours, dissolved the product with dichloromethane as a solvent, precipitated 2 to 3 times in the precipitant ether, filtered, and dried the filter cake in vacuum to obtain Two-armed L-polylactic acid; take 0.07g of 3-butyn-1-ol and 4.04g of D-lactide, put them in a flask, add 0.022g of stannous octoate, protect them under argon, and react at 130°C for 24 hours. Dissolve the product with dichloromethane as a solvent, precipitate in diethyl ether as a precipitant for 2 to 3 times, filter, and dry the filter cake in vacuum to obtain D-polylactic acid with alkynyl...

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Abstract

The invention belongs to the field of polymer materials, and particularly relates to a method for preparing a polylactic acid stereocomplex through star copolymer. The method specifically includes the steps that azido reaction is carried out on two bromine groups of a polyfunctional group initiator, then ring opening is carried out for synthesizing poly(L-lactic acid), then the poly(L-lactic acid) and poly(d-lactic acid) with alkynyl are clicked for chemical reaction, a four-arm star copolymer containing two PLLA links and two PDLA links is obtained, then stereocomplex is conducted, and finally the polylactic acid stereocomplex prepared through the star copolymer is obtained. The polylactic acid stereocomplex has the advantages of being high in melting point, good in heat resistance and the like, can be used as a nucleating agent of polylactic resin, and improves comprehensive performance of polylactic acid materials.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing a polylactic acid stereocomplex by using a star copolymer. Background technique [0002] In recent years, polylactic acid (PLA) has attracted extensive attention due to its excellent biocompatibility and biodegradability. Polylactic acid (PLA) is prepared from renewable biological resources, has good compostability and biodegradability, and can be degraded into water and carbon dioxide in the environment without polluting the environment. Therefore, PLA materials have very broad development prospects and are widely used in industrial and agricultural production and biomedical materials. However, the performance of PLA itself needs to be further improved. For example, the poor heat resistance of PLA limits its application range, and the use of stereocomposite technology is the direction of developing heat-resistant PLA in recent years. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G63/685C08G63/85
Inventor 李建波周科瑜任杰
Owner TONGJI UNIV