Application of polysiloxane elastomers based on aryl disulfide bonds and imine bonds as self-healing materials

The technology of polysiloxane and healing material is applied in the field of polysiloxane elastomer and its preparation, which can solve the problems of difficult implementation, stimulation, harsh conditions, etc., and achieve the effects of low cost, simple synthesis process and obvious application prospect.

Inactive Publication Date: 2021-03-23
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 elastomers based on aryl disulfide bonds and imine bonds as self-healing materials
  • Application of polysiloxane elastomers based on aryl disulfide bonds and imine bonds as self-healing materials
  • Application of polysiloxane elastomers based on aryl disulfide bonds and imine bonds as self-healing materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Empty 50ml of the reaction bottle, the extraction - the inflation process three times to exclude oxygen in the system. 5 g of polydimethylsiloxane and 0.248 g of 4,4'-diaminobenzothybenzozine were placed in the reaction bottle, and then charged once. 20 ml of anhydrous methylene chloride was injected, and stirred thoroughly to completely dissolve.

[0032] (2) Empty 50ml of the reaction bottle, the extraction - the inflation process three times to exclude oxygen in the system. 0.162 g of 1,3,5-triphenylhydehyde, 0.015 g of trifluoromethanesulfonate is placed in the reaction bottle, and then charge it once. 10 ml of anhydrous methylene chloride was injected, and stirred thoroughly to completely dissolve.

[0033] (3) In the solution of the needle tube extraction step (1), in the solution of step (2), at room temperature for 24 h, the reaction solution poured into the mold of Tufluoroethylene, and the mold was placed in a fan in a fume hood. Overnight, dried in a vacuum o...

Embodiment 2

[0035] (1) Empty 50ml of the reaction bottle, the extraction - the inflation process three times to exclude oxygen in the system. 5 g of polydimethylsiloxane and 0.062 g of 4,4'-di aminoxylbenzozine were placed in the reaction bottle, and then charged once. 20 ml of anhydrous methylene chloride was injected, and stirred thoroughly to completely dissolve.

[0036](2) Empty 50ml of the reaction bottle, the extraction - the inflation process three times to exclude oxygen in the system. 0.081 g of 1,3,5-triphenylhydraldehyde, 0.011 g of trifluoromethanesulfonate is placed in the reaction bottle, and then charge it once. 10 ml of anhydrous methylene chloride was injected, and stirred thoroughly to completely dissolve.

[0037] (3) In the solution of the needle tube extraction step (1), in the solution of step (2), at room temperature for 24 h, the reaction solution poured into the mold of Tufluoroethylene, and the mold was placed in a fan in a fume hood. Overnight, dried in a vacuum ov...

Embodiment 3

[0039] (1) Empty 50ml of the reaction bottle, the extraction - the inflation process three times to exclude oxygen in the system. 5 g of polydimethylsiloxane and 0.248 g of 4,4'-diaminobenzothybenzozine were placed in the reaction bottle, and then charged once. 20 ml of anhydrous methylene chloride was injected, and stirred thoroughly to completely dissolve.

[0040] (2) Empty 50ml of the reaction bottle, the extraction - the inflation process three times to exclude oxygen in the system. 0.162 g of 1,3,5-trimethylhydrahydehyde, 0.025 g of trifluoromethanesulfonate is placed in the reaction bottle, and then charge it once. 10 ml of anhydrous methylene chloride was injected, and stirred thoroughly to completely dissolve.

[0041] (3) In the solution of the step (2), the solution in the step (2) was added to the solution of the step (2), and the reaction solution was poured into the mold of Tufluoride, and the mold was volatilized in a fan in a fan. Overnight, dried in a vacuum oven ...

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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 present invention belongs to the polysiloxane elastomer and its preparation, and more particularly, the present invention relates to a polysiloxane elastomer based on an aromatic doubles and animide bond and a preparation method thereof. Background technique [0002] As one of the most important special synthetic polymers, polysiloxane elastomers, has no toxic, high insulation, heat resistance, cold-resistant, etc., so there are various high-tech fields such as defense, military, aviation, aerospace. Instead of application value and become a research hotspot for research workers. During long-term use, polysiloxane elastomers typically require high temperature, low temperature, corrosion, irradiation, alternating load, etc., and inevitably partially damage and microcracks. These microcracks are deeply inside the material, and in practical applications, it is limited to human materials and economic costs, and it is difficult to use conventional means to p...

Claims

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Application Information

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Patent Type & Authority Patents(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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