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Polydimethylsiloxane self-repairing elastomer based on hydrazide bond and preparation method thereof

A polydimethylsiloxane and self-repairing technology, which is applied in the field of polymer materials, can solve the problems of poor stability and less research, and achieve the effects of fast repair speed, simple preparation method and broad application prospects

Inactive Publication Date: 2018-09-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polydimethylsiloxane rubber is widely used in biomedicine, electronic appliances and other fields due to its excellent performance, but like other polymer materials, its long-term use stability is poor
In recent years, there have been more and more studies on the self-healing of polydimethylsiloxane, but most of the researches mainly focus on the preparation of microcapsule self-healing polydimethylsiloxane [S.H.Cho, H.M.Andersson, S.R. White, N.R.Sottos, P.V.Braun, Adv.Mater.2006,18,8,997-1000], while the research on intrinsic type self-healing polydimethylsiloxane is less [J.Zhao, R.Xu, G .Luo, J. Wu and H. Xia, J. Mater. Chem. B, 2015, 4, 5, 982-989]
At present, there is no research report on the introduction of dynamic acylhydrazone bonds into polydimethylsiloxane systems to prepare polydimethylsiloxane self-healing elastomers based on acylhydrazone bonds

Method used

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  • Polydimethylsiloxane self-repairing elastomer based on hydrazide bond and preparation method thereof
  • Polydimethylsiloxane self-repairing elastomer based on hydrazide bond and preparation method thereof
  • Polydimethylsiloxane self-repairing elastomer based on hydrazide bond and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1. Preparation of self-healing elastomer based on tetrahydrazide functionalized polydimethylsiloxane and terephthalaldehyde

[0052] 1) 50.0g of diamino-terminated polydimethylsiloxane (2500g / mol, 0.02mol) (purchased from Sigma-Aldrich company, the name provided by the company is poly(dimethylsiloxane), bis(3 -Aminopropyl) capping) was added to 120g methanol, and nitrogen gas was passed for 30min. Then, 7.2 g of methyl acrylate (0.08 mol) was added to the system, protected by nitrogen, and reacted at room temperature for 24 h. Rotary evaporation, methanol and excess methyl acrylate were removed to obtain 54.0 g of ester functionalized polydimethylsiloxane with a yield of 95%;

[0053] 2) Weigh 52.0g of the above product (0.07mol ester group) and add it to 45g of hydrazine hydrate, N 2 Protection, reaction at 115°C for 24h. After the reaction, add an appropriate amount of chloroform for dilution, wash with a 1:1 mixture of water and saturated saline, and satur...

Embodiment 2

[0060] Example 2, Preparation of self-healing elastomer based on tetrahydrazide functionalized polydimethylsiloxane and terephthalaldehyde

[0061] 1) 0.5g terephthalaldehyde and 5.3g tetrahydrazide functionalized polydimethylsiloxane prepared according to Example 1 were mixed and dissolved in toluene, the total mass fraction was 15%, and the hydrazide group and The molar ratio of the aldehyde group is 1:1, stirred at room temperature for 24 hours, transferred to a polytetrafluoroethylene mold, volatilized at room temperature to remove most of the solvent, and vacuum-dried at 80°C until the quality no longer changes, that is, a self-healing Functional polydimethylsiloxane elastomer;

[0062] 2) Acid healing test: the prepared polydimethylsiloxane elastomer was cut into discs with a diameter of 8 mm and a thickness of 0.7 mm, and the sample was cut along the diameter direction with a blade. At room temperature, apply 2 drops of glacial acetic acid or trifluoroacetic acid or di...

Embodiment 3

[0067] Example 3, Preparation of self-healing elastomer based on tetrahydrazide functionalized polydimethylsiloxane and terephthalaldehyde

[0068] 1) 0.25g of terephthalaldehyde and 5.3g of tetrahydrazide functionalized polydimethylsiloxane prepared according to Example 1 were mixed and dissolved in chloroform, the total mass fraction was 10%, and the hydrazide group The molar ratio to the aldehyde group is 1:0.5, stirred at room temperature for 24 hours, transferred to a polytetrafluoroethylene mold, volatilized at room temperature to remove most of the solvent, and vacuum-dried at 80°C until the quality no longer changes, that is, to obtain Healing polydimethylsiloxane elastomer;

[0069] 2) Acid healing test: the prepared polydimethylsiloxane elastomer was cut into discs with a diameter of 8 mm and a thickness of 0.7 mm, and the sample was cut along the diameter direction with a blade. At room temperature, apply 2 drops of glacial acetic acid or trifluoroacetic acid or di...

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Abstract

The invention discloses a polydimethylsiloxane self-repairing elastomer based on a hydrazide bond and a preparation method thereof. The self-repairing elastomer is prepared from tetrahydrazide-functionalized polydimethylsiloxane and polyaldehyde through solution volatilization for film formation. The preparation method is simple; the elastomer can realize self-repairing under the catalysis of a small amount of external acid at room temperature or under simple heating conditions, and is fast in repairing speed and good in repair performance. In addition, through the introduction of the dynamichydrazide bond, the elastomer has thermoplastic performance and can be repeatedly formed by hot pressing, so the elastomer has good application prospects.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polydimethylsiloxane self-repairing elastomer based on an acylhydrazone bond and a preparation method thereof. Background technique [0002] A self-healing material is a material that can repair itself without external action when it is damaged. The current research on self-healing materials is mainly divided into two categories: explanted and intrinsic. Explanted self-healing materials require the addition of a healing agent, represented by an epoxy system. This method has the problem of exhaustion of the healing agent. In contrast, intrinsic self-healing materials rely on the structural characteristics of the system itself, do not require additional healing agents, and belong to multiple reversible self-healing materials. The forces on which intrinsic self-healing depends include supramolecular interactions (such as hydrogen bonds, π-π stacking, and metal-coordi...

Claims

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Application Information

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IPC IPC(8): C08L51/08C08L83/04C08K5/07C08F8/32C08F283/12C08F220/14C08J5/18
Inventor 刘琛阳张东东阮英波张宝庆
Owner INST OF CHEM CHINESE ACAD OF SCI
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