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Variable-stiffness self-repairing material containing metal-sulfydryl coordinate bond as well as preparation and application thereof

A technology of self-healing materials and variable stiffness, applied in the direction of additive processing, adhesives, etc., can solve the problems of limited practical application fields, water vapor sensitivity, cumbersome synthesis steps, etc., and achieve good self-healing performance, simple steps, and excellent flexibility. Effect

Active Publication Date: 2021-12-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, self-healing materials based on coordination bonds have the following disadvantages: (1) The synthesis steps are relatively cumbersome, requiring multi-step synthesis to introduce ligand-hole units into the long chain of the polymer, and then add metal ions to complete the coordination form a cross-linked network
(2) Metal-hydroxyl (Science 2010,328,216.; Adv.Mater.2014,26,3415.; Chem.Sci.2016,7,2736.) or metal-amine (Nat .Mater.2015,14,1210.; Macromolecules 2016,49,6310.; Polym.Chem.2018,9,3543.) The coordination structure is used as the cross-linking point, which is sensitive to water vapor, which greatly limits the practical application field

Method used

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  • Variable-stiffness self-repairing material containing metal-sulfydryl coordinate bond as well as preparation and application thereof
  • Variable-stiffness self-repairing material containing metal-sulfydryl coordinate bond as well as preparation and application thereof
  • Variable-stiffness self-repairing material containing metal-sulfydryl coordinate bond as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A variable stiffness self-healing material containing metal-mercapto coordination bonds and a preparation method thereof:

[0070] Add 50.00 g of pentaerythritol tetra-3-mercaptopropionate into the flask, then add 100 mL of dichloromethane as a solvent, control the reaction temperature at 25°C, stir at a speed of 100 r / min, and react for 30 minutes to obtain a mercapto-terminated compound solution;

[0071] Add 8.28g of triethylamine to the above-mentioned thiol-terminated compound solution, control the reaction temperature under sealed conditions at 25°C, stir at 200r / min, and react for 4h;

[0072] Add 0.30 g of pentaerythritol triacrylate to the above mixed system, control the reaction temperature under sealed conditions at 25°C, stir at a speed of 200r / min, and react for 6h;

[0073] Preparation of metal zinc salt solution: take 13.79g of zinc chloride, add 15mL of methanol as a solvent, and perform ultrasonic treatment for 2 hours at 25°C and ultrasonic power of 12...

Embodiment 2

[0078] A variable stiffness self-healing material containing metal-mercapto coordination bonds and a preparation method thereof:

[0079] Add 80.00g of trimethylolpropane tris(2-mercaptoacetate) and 19.83g of mercapto-terminated liquid polysulfide resin with a relative molecular mass of 1000 into the flask, then add 100mL of dichloromethane as a solvent, and control the reaction temperature at 25°C. The stirring speed was 150r / min, and the reaction was carried out for 30min to obtain the compound solution of the terminal mercapto group;

[0080] Add 20.00 g of triethanolamine to the above-mentioned mercapto-terminated compound solution, control the reaction temperature under sealed conditions at 25°C, stir at 250 r / min, and react for 4 hours;

[0081] Add 30.00 g of pentaerythritol triacrylate to the above mixed system, control the reaction temperature under sealed conditions at 25°C, stir at 200 r / min, and react for 6 hours;

[0082] Preparation of metal zinc salt solution: ...

Embodiment 3

[0088] Add 20.00g of 2,7-naphthyl dithiol and 4.16g of mercapto-terminated liquid polysulfide resin with a relative molecular mass of 4000 into the flask, then add 100mL of tetrahydrofuran as a solvent, control the reaction temperature at 25°C, stir at a speed of 180r / min, and react for 20min , to obtain a compound solution of a mercapto group;

[0089] Add 2.84g of N,N-dimethylbenzylamine to the above-mentioned mercapto-terminated compound solution, control the reaction temperature under sealed conditions at 25°C, stir at 250r / min, and react for 4 hours;

[0090] Add 7.72g of triphenylmethane triisocyanate to the above mixed system, control the reaction temperature under sealed conditions at 25°C, stir at 300r / min, and react for 6h;

[0091] Preparation of metal zinc salt solution: Take 7.12g of zinc sulfate, add 10mL of methanol as a solvent, and perform ultrasonic treatment for 1h at 25°C and ultrasonic power of 90W;

[0092] Preparation of other metal salt solutions: Take 4...

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Abstract

The invention relates to a variable stiffness self-repairing material containing a metal-sulfydryl coordination bond. The variable stiffness self-repairing material is prepared from a sulfydryl-terminated small molecule compound, sulfydryl-terminated liquid polysulfide resin, a cross-linking agent, zinc salt, other metal salts, an alkaline regulator and a solvent. The structure of the material contains a large number of metal-sulfydryl coordination bonds, and the coordination bonds have good thermodynamic stability, so that the material has higher rigidity and mechanical strength; the good dynamic activity of the coordination bond ensures that the material has good self-repairing performance; due to the high temperature sensitivity of the coordination bond, the variable stiffness of the material in a wide temperature range is ensured; the coordination bond is insensitive to water, so that the environmental use stability of the material is ensured; meanwhile, the material has the characteristics of high transparency and adjustable refractive index. The variable stiffness self-repairing material containing the metal-sulfydryl coordinate bond can be applied to the fields of sealants, self-repairing coatings, temperature-sensitive variable stiffness self-repairing engineering materials, additive manufacturing, composite materials, optical transparent adhesives and the like.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a self-repairing material containing a coordination bond and a preparation method and application thereof, in particular to a variable stiffness self-repairing material containing a metal-mercapto coordination bond and a preparation method and application thereof. Background technique [0002] Self-healing materials are a new class of smart materials that can mimic organisms for self-healing when physically damaged by the environment or mechanical fatigue. This kind of material is of great significance for prolonging the service life of materials and improving the stability of materials, and has gradually become one of the research hotspots. It has shown great development prospects and application value in industries such as aerospace, shipbuilding, construction, and automobiles. . [0003] Self-healing materials can be divided into two categories: external aid type and intrinsic type...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08L87/00B33Y70/00C09J187/00
CPCC08G83/008C08L87/00B33Y70/00C09J187/00
Inventor 李承辉李文王洪芹高文通
Owner NANJING UNIV
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