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Poly lactic acid stereocomplex with interpenetrating network structure and preparation method thereof

A technology of interpenetrating network structure and stereocomplex, which is applied in the field of polylactic acid stereocomplex and its preparation, can solve the problems of difficult structure control, poor stability, large environmental protection pressure, etc., and achieves easy operation and high reliability. Effects of repeatability, high heat resistance temperature and thermal stability

Active Publication Date: 2014-08-06
ZHEJIANG HISUN BIOMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to use a large amount of halogen-containing organic solvents in the process of synthesizing polylactic acid. Therefore, it faces greater environmental protection pressure in terms of solvent post-treatment.
Another example is the Chinese patent (ZL201110245655.1) which discloses a PLLA-PDLA copolymer with a branched structure. The resulting stereocomplex crosslinked copolymer can form a physically crosslinked network structure, endowing the material with thermoplastic shape memory. Function, high toughness and certain heat resistance, but the structure of the above products is not easy to control, and the stability of heat is not good

Method used

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  • Poly lactic acid stereocomplex with interpenetrating network structure and preparation method thereof
  • Poly lactic acid stereocomplex with interpenetrating network structure and preparation method thereof
  • Poly lactic acid stereocomplex with interpenetrating network structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 50 parts by weight of L-lactide in a reaction kettle with a stirring blade, add 0.003 parts by weight of initiator stannous octoate, and carry out the reaction under a nitrogen atmosphere at a temperature of 120°C for 2 hours, and the reaction ends Finally, after removing the residual L-lactide under reduced pressure, add 5 parts by weight of the crosslinking agent styrene-glycidyl methacrylate random copolymer, and continue to control the temperature to carry out the polymerization reaction at 160°C for 30 minutes. To obtain cross-linked PLLA, then, add 50 parts by weight of D-lactide and 0.003 parts by weight of initiator stannous octoate, control the temperature and carry out the reaction at 160°C for 2 hours, and remove the remaining D-lactide under reduced pressure to obtain Polylactic acid stereocomplex with semi-interpenetrating network structure. The gel content of the product and the melting enthalpy and melting point of polylactic acid were tested. The res...

Embodiment 2

[0031] Put 30 parts by weight of L-lactide in a reaction kettle with a stirring blade, add 0.001 parts by weight of initiator stannous octoate, and carry out the reaction under nitrogen atmosphere at a controlled temperature of 120°C for 2 hours. After the reaction , after removing residual L-lactide under reduced pressure, add 0.5 parts by weight of cross-linking agent lysine triisocyanate, continue to control the temperature and carry out polymerization reaction at 180°C for 30 minutes to obtain cross-linked PLLA, and then add 70 parts by weight of D - Lactide and 0.002 parts by weight of the initiator stannous octoate, the temperature is controlled at 160 ° C for 1 hour of polymerization reaction, the temperature is raised to 220 ° C and the reaction is continued for 2 hours to complete the reaction, the remaining D-lactide is removed under reduced pressure, and then , adding 0.5 parts by weight of a cross-linking agent lysine triisocyanate, controlling the temperature and r...

Embodiment 3

[0033] Put 70 parts by weight of L-lactide in a reaction kettle with a stirring blade, add 0.005 parts by weight of initiator stannous octoate, and carry out the reaction at 120°C under nitrogen atmosphere for 2 hours, and remove under reduced pressure After the residual L-lactide, add 10 parts by weight of cross-linking agent polydicyclohexylmethane carbodiimide, continue to control the temperature and react at 160°C for 30 minutes to obtain cross-linked PLLA, then add 30 parts by weight D-lactide and 0.001 parts by weight of the initiator stannous octoate, the temperature was controlled at 160 ° C for 1 hour, and then the temperature was raised to 220 ° C intermittently for 2 hours to complete the reaction, and the remaining D-lactide was removed under reduced pressure. ester, and then add 5 parts by weight of cross-linking agent polydicyclohexylmethanecarbodiimide, and control the temperature at 220° C. for 30 minutes to form a polylactic acid stereocomplex with a completely...

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Abstract

The invention relates to a poly lactic acid stereocomplex with an interpenetrating network structure and a preparation method thereof, belongs to the technical field of high polymer materials, and aims to solve the problems that the conventional poly lactic acid stereocomplex is poor in thermal stability and low in heat-resistance temperature. The preparation method comprises the following steps: mixing L-lactide or D-lactide with an initiator, performing a polymerization reaction to obtain linetype PLLA or PDLA, and adding a cross-linking agent to obtain cross-linking PLLA or PDLA; when the cross-linking PLLA is adopted, adding the cross-linking PLLA into a mixture of D-lactide and the initiator, and heating to polymerize D-lactide to completely react; when the cross-linking PDLA is adopted, adding the cross-linking PDLA into a mixture of L-lactide and the initiator, and heating to polymerize L-lactide to completely react to obtain the poly lactic acid stereocomplex with the interpenetrating network structure. The poly lactic acid stereocomplex has the advantages of high heat-resistance temperature and excellent stability.

Description

technical field [0001] The invention relates to a polylactic acid stereocomplex with an interpenetrating network structure and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Polylactic acid is a biodegradable and environmentally friendly polymer material, which has positive significance for reducing carbon dioxide emissions and solving "white pollution". However, in practical applications, some inherent defects of polylactic acid limit its large-scale application, especially the low heat resistance, so that polylactic acid materials can only be used to prepare lower value-added products. [0003] Existing in order to improve the heat resistance of polylactic acid, through a large number of studies to improve the heat resistance of polylactic acid. For example, a polylactic acid composition disclosed in Chinese patent (ZL200580010634.4) mainly uses polylactic acid as a semi-crystalline material. Therefore, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08G63/08C08J3/24
Inventor 边新超刘焱龙梁伟孙彬陈志明陈学思
Owner ZHEJIANG HISUN BIOMATERIALS
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