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Polydimethylsiloxane self-repairing material based on disulfide exchange reaction and preparation method thereof

A technology of polydimethylsiloxane and self-healing material, applied in the field of polydimethylsiloxane self-healing material and its preparation, can solve the problems of low mechanical strength and the like, and improve breaking strength and elongation at break , The effect of reducing cost and increasing mechanical strength

Active Publication Date: 2019-09-06
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defect of low mechanical strength of the material, isocyanate is added to react with amino group to form urea group

Method used

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  • Polydimethylsiloxane self-repairing material based on disulfide exchange reaction and preparation method thereof
  • Polydimethylsiloxane self-repairing material based on disulfide exchange reaction and preparation method thereof
  • Polydimethylsiloxane self-repairing material based on disulfide exchange reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of preparation method of polydimethylsiloxane self-healing material based on disulfide bond exchange reaction of the present invention, its preparation process step is:

[0054] a. Dissolve 5g of 4,4-diaminodiphenyl disulfide in 50mL CH 2 Cl 2 Add 8.15g of triethylamine and stir to dissolve it, pour the dissolved liquid into a clean three-necked flask, and pass through dry N 2 .

[0055] b. Under ice bath conditions, take 3.90g triphosgene and dissolve in 20mL CH 2 Cl 2 Slowly add it dropwise to the above liquid with a constant pressure funnel.

[0056] c. React for 5 minutes under ice-bath conditions, wash the reacted product twice with ice water, remove the liquid in the lower layer, and dry in vacuo to obtain a light yellow powder.

[0057] d. Take a clean three-necked flask, add 20g of amino-terminated polydimethylsiloxane (PDMS) with a molecular weight of 2000, dissolve it in 100mL of THF, and stir evenly.

[0058] e. Feed nitrogen into the three-necke...

Embodiment 2

[0063] A kind of preparation method of polydimethylsiloxane self-healing material based on disulfide bond exchange reaction of the present invention, its preparation process step is:

[0064] a. Dissolve 5g of 4,4-diaminodiphenyl disulfide in 50mL CH 2 Cl 2 Add 8.15g of triethylamine and stir to dissolve it, pour the dissolved liquid into a clean three-necked flask, and pass through dry N 2 .

[0065] b. Under the condition of ice bath, take 3.98g triphosgene and dissolve it in 20mL CH 2 Cl 2 Slowly add it dropwise to the above liquid with a constant pressure funnel.

[0066] c. React for 10 min under ice-bath conditions, wash the reacted product twice with ice water, remove the liquid in the lower layer, and vacuum-dry to obtain a light yellow powder.

[0067] d. Take a clean three-necked flask, add 10 g of amino-terminated polydimethylsiloxane (PDMS) with a molecular weight of 1000, dissolve it in 100 mL of THF, and stir evenly.

[0068] e. Feed nitrogen gas into the t...

Embodiment 3

[0073] A kind of preparation method of polydimethylsiloxane self-healing material based on disulfide bond exchange reaction of the present invention, its preparation process step is:

[0074] a. Dissolve 5g of 4,4-diaminodiphenyl disulfide in 50mL CH 2 Cl 2 Add 8.15g of triethylamine and stir to dissolve it, pour the dissolved liquid into a clean three-necked flask, and pass through dry N 2 .

[0075] b. Under the condition of ice bath, take 6.02g triphosgene and dissolve it in 20mL CH 2 Cl 2 Slowly add it dropwise to the above liquid with a constant pressure funnel.

[0076] c. React for 8 minutes under ice bath conditions, wash the reacted product twice with ice water, remove the liquid in the lower layer, and dry in vacuo to obtain a light yellow powder.

[0077] d. Take a clean three-necked flask, add 50g of amino-terminated polydimethylsiloxane (PDMS) with a molecular weight of 5000, dissolve it in 100mL of THF, and stir evenly.

[0078] e. Introduce nitrogen into t...

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Abstract

The invention provides a polydimethylsiloxane self-repairing material based on disulfide bond exchange reaction and a preparation method thereof, and belongs to the technical field of self-repairing new materials and preparation. It is of great significance that chemical bonds capable of reversible exchange are adopted to repair material damage, and theoretically the capability of repairing damageindefinitely is achieved. According to the preparation method, disulfide bonds serve as self-healing bonds of the material, and then one or more kinds of diisocyanates are cross-linked with PDMS to finally obtain the self-repairing PDMS elastomer. Due to addition of the diisocyanates, urea groups are formed, then intermolecular hydrogen bonds are formed, and the crosslink density of the materialis increased. In addition, the preparation method is simple and feasible, and the material has excellent mechanical properties and self-repairing properties under the combined action of the hydrogen bonds and the disulfide bonds. The self-repairing functional material is an important new material; the polydimethylsiloxane self-repairing material based on disulfide bond exchange reaction and the preparation method thereof are expected to solve the technical problems that cannot be solved by traditional methods, and have great development prospects and application value in some important engineering and cutting-edge technical fields.

Description

technical field [0001] The invention relates to the technical field of self-healing elastomers and their preparation, in particular to a polydimethylsiloxane self-healing material based on a disulfide bond exchange reaction and a preparation method thereof. Background technique [0002] With the development of science and technology, polymer materials play an increasingly important role in people's daily life, especially in the fields of material surface protection, flexible electronic devices, and biomaterials. Since traditional polymer materials are mainly formed by irreversible covalent bond cross-linking, once the material is damaged by external mechanical action, it is difficult to recover, thus reducing the service life of the material. In recent years, the development of self-healing materials provides an ideal way to solve this problem. [0003] According to the principle of material self-healing, self-healing materials are divided into two types: foreign aid self-h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/61C08G18/32
CPCC08G18/3855C08G18/61
Inventor 孙智勇陈光孟蔺存国郑纪勇张金伟王利
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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