High polymer material capable of realizing self-healing of chemical bond damage under humid and stressed conditions and preparation method of high polymer material

A technology of polymer materials and chemical bonds, which is applied in the field of polymer materials and their preparation, can solve problems such as the inability to maintain long-term stability of mechanical properties, and achieve the effect of strong mechanical properties

Active Publication Date: 2020-07-17
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the long-term stability defect of mechanical properties described in the above-mentioned prior art, the present invention provides a polymer material capable of self-healing chemical bond damage under moisture and stress conditions, and the polymer material provided can Self-healing of chemical bond damage under stress conditions, self-healing at the initial stage of micro-damages, timely elimination of micro-damages under stress, stable mechanical strength, and long-term stability of mechanical properties

Method used

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  • High polymer material capable of realizing self-healing of chemical bond damage under humid and stressed conditions and preparation method of high polymer material
  • High polymer material capable of realizing self-healing of chemical bond damage under humid and stressed conditions and preparation method of high polymer material
  • High polymer material capable of realizing self-healing of chemical bond damage under humid and stressed conditions and preparation method of high polymer material

Examples

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Effect test

Embodiment 1

[0058] This example provides a polymer material capable of self-healing of chemical bond damage under moisture and stress conditions, specifically cross-linked polyurethane, and its preparation method is as follows:

[0059] (1) Preparation of polyurethane prepolymer

[0060] Under the protection of high-purity nitrogen, 200g polyethylene glycol (molecular weight is 800g / mol) is added in the three-necked flask, then in the three-necked flask, add 500mL N, N-dimethylformamide, under the mechanical stirring condition above-mentioned Polyethylene glycol is completely dissolved, then 111g of isophorone diisocyanate is added to the above mixed solution through a constant pressure dropping funnel, after mixing evenly, 0.15g of dibutyltin dilaurate is added, and the temperature of the reaction system is adjusted to 40°C. After 12 hours of reaction, a polyurethane prepolymer was prepared.

[0061] (2) Preparation of terminal dihydroxyhistidine monomer

[0062] Dissolve 63g of Boc-L-...

Embodiment 2

[0071] This example provides a polymer material capable of self-healing of chemical bond damage under moisture and stress conditions, specifically cross-linked polyurethane, and its preparation method is as follows:

[0072] (1) Preparation of polyurethane prepolymer

[0073] Under the protection of high-purity nitrogen, add 200g of polytetrahydrofuran diol (molecular weight: 5000g / mol) into the three-necked flask, then add 500mL of dimethylformamide into the three-necked flask, and mix the above polyethylene diol under mechanical stirring Alcohol is completely dissolved, then add 13.2g of dimethyl biphenyl diisocyanate to the above mixed solution through a constant pressure dropping funnel, after mixing evenly, add 0.25g of dibutyltin dilaurate, adjust the temperature of the reaction system to 80°C, react After 12 hours, a polyurethane prepolymer was prepared.

[0074] (2) Preparation of terminal dihydroxyhistidine monomer

[0075] Dissolve 10.1g of Boc-L-histidine and 4.5g...

Embodiment 3

[0084] This example provides a polymer material capable of self-healing of chemical bond damage under moisture and stress conditions, specifically cross-linked polyurethane, and its preparation method is as follows:

[0085] (1) Preparation of polyurethane prepolymer

[0086] Under the protection of high-purity nitrogen, add 200g polypropylene glycol (molecular weight is 2000g / mol) in the three-necked flask, then add 500mL dimethylformamide in the three-necked flask, and dissolve the above-mentioned polyethylene glycol completely under the condition of mechanical stirring , and then add 23.2g of p-phenylene diisocyanate to the above mixed solution through a constant pressure dropping funnel, after mixing evenly, add 0.1g of dibutyltin dilaurate, adjust the temperature of the reaction system to 60°C, and prepare the polyurethane preprepared after 12 hours of reaction Polymer.

[0087] (2) Preparation of terminal dihydroxyhistidine monomer

[0088] Dissolve 25.2g of Boc-L-hist...

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Abstract

The invention discloses a polymer material capable of realizing self-healing of chemical bond damage under humid and stressed conditions and a preparation method of the polymer material. The polymer material is prepared from linear polymers through crosslinking via reversible bonds, wherein the reversible bonds comprise a divalent metal ion-histidine coordination bond and a Fe<3+>-dopamine coordination bond; when the high polymer material is not stressed, the coordination number of Fe<3+> in the Fe<3+>-dopamine coordination bond is 4; the linear polymers comprise soft segments and hard segments; histidine groups in the divalent metal ion-histidine coordination bond comes from side groups of the soft segments, and dopamine groups in the Fe<3+>-dopamine coordination bond comes from side groups of the hard segments. The polymer material provided by the invention can perform self-healing of chemical bond damage under humid and stressed conditions, can realize self-repairing at an initial stage of micro-damage generation, eliminates micro-damage generated during stress in time, prevents the micro-damage from expanding, stabilizes the mechanical strength of the material, and maintains long-term stability in the aspect of mechanical properties.

Description

technical field [0001] The invention relates to the technical field of self-healing materials, more specifically, to a polymer material capable of self-healing chemical bond damage under wet and stress conditions and a preparation method thereof. Background technique [0002] In recent years, the rapid development of high technology has not only greatly broadened the application fields of polymer materials, but also put forward more and more new requirements for their performance. It is worth noting that during the molding process and use of polymer materials, local damage and microcracks will inevitably occur. These defects are often difficult to detect and are easy to further expand to cause macroscopic cracks, which significantly reduces the safety of the product. and longevity. Therefore, endowing materials with micro-damage self-healing ability and maintaining stable material properties has become an effective means to solve this problem. [0003] Self-healing is an i...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L75/08C08G18/66C08G18/48C08G18/32C08G18/38C08G18/10
CPCC08G18/10C08G18/3848C08G18/3876C08G18/48C08G18/4833C08G18/4854C08G18/6666C08J3/24C08J2375/08
Inventor 李明轩章明秋容敏智
Owner SUN YAT SEN UNIV
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