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Polysiloxane elastomer based on aryl disulfide bond and imine bond and preparation method thereof

A polysiloxane and disulfide bond technology is applied in the field of polysiloxane elastomers and their preparation, which can solve the problems of irritation, harsh conditions, and difficult to implement, and achieves low cost, simple synthesis process, and obvious application prospects. Effect

Inactive Publication Date: 2020-12-29
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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  • Polysiloxane elastomer based on aryl disulfide bond and imine bond and preparation method thereof
  • Polysiloxane elastomer based on aryl disulfide bond and imine bond and preparation method thereof
  • Polysiloxane elastomer based on aryl disulfide bond and imine bond and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Vacuumize the 50mL reaction bottle, and perform the pumping-gassing process three times to eliminate the oxygen in the system. 5 g of polydimethylsiloxane and 0.248 g of 4,4'-diaminodiphenyl disulfide were placed in the reaction bottle, and then inflated and deflated once. Add 20mL of anhydrous dichloromethane by injection, stir well to dissolve it completely.

[0032] (2) Vacuumize the 50mL reaction bottle, and perform the pumping-gassing process three times to eliminate the oxygen in the system. Put 0.162g of 1,3,5-tritylaldehyde and 0.015g of zinc trifluoromethanesulfonate in the reaction bottle, and then inflate and deflate it once. Add 10mL of anhydrous dichloromethane by injection, stir well to dissolve it completely.

[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 evapo...

Embodiment 2

[0035] (1) Vacuumize the 50mL reaction bottle, and perform the pumping-gassing process three times to eliminate the oxygen in the system. 5 g of polydimethylsiloxane and 0.062 g of 4,4'-diaminodiphenyl disulfide were placed in the reaction bottle, which was inflated and deflated again. Add 20mL of anhydrous dichloromethane by injection, stir well to dissolve it completely.

[0036](2) Vacuumize the 50mL reaction bottle, and perform the pumping-gassing process three times to eliminate the oxygen in the system. Put 0.081g of 1,3,5-trithenylaldehyde and 0.011g of zinc trifluoromethanesulfonate in the reaction bottle, and then inflate and deflate it once. Add 10mL of anhydrous dichloromethane by injection, stir well to dissolve it completely.

[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 e...

Embodiment 3

[0039] (1) Vacuumize the 50mL reaction bottle, and perform the pumping-gassing process three times to eliminate the oxygen in the system. 5 g of polydimethylsiloxane and 0.248 g of 4,4'-diaminodiphenyl disulfide were placed in the reaction bottle, and then inflated and deflated once. Add 20mL of anhydrous dichloromethane by injection, stir well to dissolve it completely.

[0040] (2) Vacuumize the 50mL reaction bottle, and perform the pumping-gassing process three times to eliminate the oxygen in the system. Put 0.162g of 1,3,5-trithenylaldehyde and 0.025g of europium trifluoromethanesulfonate into the reaction bottle, and then inflate and deflate it once. Add 10mL of anhydrous dichloromethane by injection, stir well to dissolve it completely.

[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 h, pour the reaction solution into a tetrafluoroethylene mold, and place the mold in a fume hood to e...

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Abstract

The invention discloses a polysiloxane elastomer based on an aryl disulfide bond and an imine bond, and a preparation method thereof. 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 preparation method of the invention prepares the polysiloxane elastomer with excellent self-healing performance and high elongation at break; 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 the preparation method is simple in process and easy to control, and raw materials used in the method 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, more specifically, relates to a polysiloxane elastomer based on aryl disulfide bond and imine bond and its preparation method. Background technique [0002] As one of the most important special synthetic polymers, polysiloxane elastomer has many excellent properties such as non-toxic, tasteless, high insulation, heat resistance, cold resistance, etc. It has irreplaceable application value, and has increasingly become a research hotspot for scientific researchers. During long-term use, polysiloxane elastomers usually need to withstand various extreme working conditions such as high temperature, low temperature, corrosion, irradiation, and alternating loads, and local damage and microcracks are inevitable inside. These microcracks are hidden deep inside the material, but in practical applications, limited by manpower, material resources and economic costs, it is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/392C08G77/38
CPCC08G77/38C08G77/392
Inventor 郑俊萍吕弛赵恺丰
Owner TIANJIN UNIV
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