Application of polysiloxane elastomer based on aryl disulfide bond and imine bond as self-healing material

A technology of polysiloxane and healing materials, which is applied in the field of polysiloxane elastomer and its preparation, can solve the problems of harsh conditions, difficult implementation, stimulation, etc., and achieve the effect of low cost, simple synthesis process and significant application prospects

Inactive Publication Date: 2019-02-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the research of a small number of polysiloxane self-healing materials, the realization of self-healing still mostly requires external light, heat or solvent stimulation, such as ultraviolet light irradiation, high temperature, etc., and the conditions are harsh and difficult to implement.
The preparation of self-healing polysiloxane elastomers by introducing two dynamic covalent bonds of aromatic disulfide bonds and imine bonds has not been reported yet

Method used

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  • Application of polysiloxane elastomer based on aryl disulfide bond and imine bond as self-healing material
  • Application of polysiloxane elastomer based on aryl disulfide bond and imine bond as self-healing material
  • Application of polysiloxane elastomer based on aryl disulfide bond and imine bond as self-healing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Evacuate the 50 mL reaction flask, and perform an air extraction-inflation process three times to eliminate oxygen in the system. Put 5 g of polydimethylsiloxane and 0.248 g of 4,4'-diaminodiphenyl disulfide in the reaction flask, and then fill and deflate once more. Add 20 mL of anhydrous dichloromethane by injection, stir well to make it completely dissolved.

[0032] (2) Evacuate the 50 mL reaction flask, and perform an air extraction-inflation process three times to remove oxygen in the system. Put 0.162g of 1,3,5-trityl and 0.015g of zinc aldehyde trifluoromethanesulfonate in the reaction flask, and then fill and deflate once more. Add 10 mL of anhydrous dichloromethane by injection, stir well to make it completely dissolved.

[0033] (3) Use a needle to extract the solution in step (1) and add it to the solution in step (2), react at room temperature for 24 hours, pour the reaction solution into a tetrafluoroethylene mold, and place the mold in a fume hood to vol...

Embodiment 2

[0035] (1) Evacuate the 50 mL reaction flask, and perform an air extraction-inflation process three times to eliminate oxygen in the system. Put 5g of polydimethylsiloxane and 0.062g of 4,4'-diaminodiphenyl disulfide in the reaction flask, and fill and deflate once more. Add 20 mL of anhydrous dichloromethane by injection, stir well to make it completely dissolved.

[0036] (2) Evacuate the 50 mL reaction flask, and perform an air extraction-inflation process three times to remove oxygen in the system. Put 0.081g of 1,3,5- mesitylene and 0.011g of zinc aldehyde trifluoromethanesulfonate in the reaction flask, and then fill and deflate once more. Add 10 mL of anhydrous dichloromethane by injection, stir well to make it completely dissolved.

[0037] (3) Use a needle to extract the solution in step (1) and add it to the solution in step (2), react at room temperature for 24 hours, pour the reaction solution into a tetrafluoroethylene mold, and place the mold in a fume hood to volat...

Embodiment 3

[0039] (1) Evacuate the 50 mL reaction flask, and perform an air extraction-inflation process three times to eliminate oxygen in the system. Put 5 g of polydimethylsiloxane and 0.248 g of 4,4'-diaminodiphenyl disulfide in the reaction flask, and then fill and deflate once more. Add 20 mL of anhydrous dichloromethane by injection, stir well to make it completely dissolved.

[0040] (2) Evacuate the 50 mL reaction flask, and perform an air extraction-inflation process three times to remove oxygen in the system. Put 0.162g of 1,3,5-trityl and 0.025g of Europium aldehyde trifluoromethanesulfonate in the reaction flask, and then fill and deflate once more. Add 10 mL of anhydrous dichloromethane by injection, stir well to make it completely dissolved.

[0041] (3) Use a needle to extract the solution in step (1) and add it to the solution in step (2), react at room temperature for 1 hour, pour the reaction solution into a tetrafluoroethylene mold, and place the mold in a fume hood to v...

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Abstract

The invention discloses application of a polysiloxane elastomer based on an aryl disulfide bond and an imine bond as a self-healing material. According to the invention, the catalyst of 1,3,5-benzenetricarboxaldehyde, polysiloxane and diaminodiphenyl disulfide are directly cross-linked through a condensation reaction of aldehyde groups and amino groups under the action of a catalyst, and then oxygen is removed from a reaction system, so the two dynamic covalent bonds, i.e., the aryl disulfide bond and the imine bond, are simultaneously introduced into the polysiloxane. The polysiloxane elastomer with excellent self-healing performance and high elongation at break is prepared in the invention; the polysiloxane elastomer heals itself under the condition of low temperature/room temperature, only needs mild conditions and has a fast healing speed and good effect; and a preparation method for the polysiloxane elastomer is simple in process and easy to control, and raw materials used in themethod are all commercially produced products that are cheap and easily available.

Description

Technical field [0001] The invention belongs to the field of polysiloxane elastomer and its preparation, and more specifically, relates to a polysiloxane elastomer based on aromatic disulfide bonds and imine bonds, and a preparation method and application thereof. Background technique [0002] As one of the most important special synthetic polymers, polysiloxane elastomer has many excellent properties such as non-toxic and odorless, high insulation, heat resistance, cold resistance, etc., so it is used in various high-tech fields such as national defense, military industry, aviation and aerospace. Irreplaceable application value, and has increasingly become a research hotspot for scientific researchers. In the long-term use process of polysiloxane elastomer, it usually needs to withstand various extreme working conditions such as high temperature, low temperature, corrosion, irradiation, and alternating load, and its internal part is inevitably damaged and micro-cracks. These mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388C08G77/392
CPCC08G77/388C08G77/392
Inventor 郑俊萍吕弛赵恺丰
Owner TIANJIN UNIV
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