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Hyperbranched elastic material capable of self-healing and preparation method thereof

An elastic material, self-healing technology, applied in the field of material science, can solve the problem of limited healing times, and achieve the effects of low preparation cost, good controllability and wide sources

Active Publication Date: 2013-10-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, there are mainly several forms such as liquid core fiber method, microcapsule method thermal and reversible self-healing method. The first two methods usually require the cracks of the composite material system to be in contact with the nano / micro domains containing crosslinking agents, catalysts or monomers. A potential disadvantage of irreversible systems that initiate polymerization to prevent or heal cracks is that the healing times are limited as the healing agent is consumed.

Method used

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  • Hyperbranched elastic material capable of self-healing and preparation method thereof
  • Hyperbranched elastic material capable of self-healing and preparation method thereof
  • Hyperbranched elastic material capable of self-healing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] Mix 0.25mol of diethylenetriamine and 0.25mol of triethylenetetramine with 60mL of anhydrous methanol solvent, add 0.5mol of methyl acrylate and 20mL of anhydrous methanol under nitrogen protection, and react at 20°C After 36 hours, the solvent was distilled off under reduced pressure, and then the temperature was raised to 120°C and reacted for 36 hours under a vacuum of 0.05 MPa. Acetone was used as a precipitant, and after precipitation, filtration, separation, and drying, the product was obtained, which is a hyperbranched product with an amino group at the end of the molecular chain. Polymers were determined for their amine value by acid-base titration. to-NH 2 :-COOH=1:1 molar ratio, mix the above product and linoleic acid dimer acid evenly, react at 160°C for 96h under the protection of nitrogen, and obtain hyperbranched elastic material after vacuum drying. IR(KBr), ν(cm -1 )=3215(ν NH ), 2945(ν as,CH2 ), 2835(ν s,CH2 ), 1646(ν C=O ), 1553(ν CN and δ NH )...

Embodiment example 2

[0036] After mixing acrylic acid and pentaethylenehexamine with a molar ratio of 20:1, react at -20°C for 72 hours under nitrogen protection, then raise the temperature to room temperature and react for 72 hours under a vacuum of 0.095MPa, then use diethyl ether as a precipitant , after precipitation, filtration, separation, and drying, the product is a hyperbranched polymer with amino groups at the end of the molecular chain, and its amine value is determined by acid-base titration. to-NH 2 :-COOH=10:1 molar ratio Take the above product and carboxyl-terminated liquid nitrile rubber and mix evenly, react at 80°C for 120h under nitrogen protection, and obtain a hyperbranched elastic material after vacuum drying.

[0037] Differential scanning calorimetry (DSC) test was carried out on the elastic material sample. Starting from room temperature, the temperature was raised to 100°C at a heating rate of 10°C / min, and kept at a constant temperature for 3 minutes, then cooled to -80°...

Embodiment example 3

[0042] Mix 4.0 mol of triaminobenzene with 80 mL of N, N-dimethylformamide solvent evenly, add a mixture of 0.1 mol of octyl methacrylate and 0.1 mol of isooctyl methacrylate under nitrogen protection, and React at low temperature for 1 hour, remove the solvent by distillation under reduced pressure, then raise the temperature to 180°C and polymerize at a vacuum of 0.03 MPa. After reaction for 1 hour, use methyl ethyl ketone as a precipitating agent. After precipitation, filtration, separation and drying, the product obtained is The hyperbranched polymer of amino group, its amine value is determined by acid-base titration method, expressed as -NH 2 :-COOH=1:8 molar ratio, take the above product and diethylenetriaminepentaacetic acid, react at 280°C for 1h under nitrogen protection, and obtain a hyperbranched elastic material after vacuum drying.

[0043] According to the method described in Example 1, the Tg of the sample is measured to be -10°C, which can maintain the propert...

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Abstract

The invention relates to a hyperbranched elastic material capable of self-healing and a preparation method thereof. The preparation method comprises the following steps: reacting a first component containing double bond and carboxyl or ester group with a second component containing more than three amino groups at -20-50 DEG C for 1-72 hours; heating to room temperature to 200 DEG C, continuing the reaction under reduced pressure for 1-72 hours, precipitating the product, filtering, separating, and drying to obtain the hyperbranched polymer of which the molecular chain tail end is amino group; and reacting the hyperbranched polymer of which the molecular chain tail end is amino group with a third component (polybasic acid or polybasic acid mixture or carboxyl-terminated low polymer) at 80-280 DEG C for 1-120 hours to obtain the hyperbranched elastic material capable of self-healing. The hyperbranched material has elasticity at room temperature, and contains abundant amino and amido groups capable of forming reversible hydrogen bonds; and thus, the material has the characteristic of self-healing at room temperature, has thermoplastic property, and can be machined repeatedly.

Description

technical field [0001] The invention belongs to the field of material science and technology, and in particular relates to a self-healing hyperbranched elastic material and a preparation method thereof. Background technique [0002] Self-healing is defined as the ability of a material or surface to automatically or autonomously heal (restore / repair) damage without any external intervention. During the manufacture or use of almost all natural and synthetic materials, microcracks and damages will inevitably occur due to external or internal factors such as heat or force, resulting in a decrease in the performance and service life of the material. Therefore, the research on materials with self-healing and self-healing capabilities has important practical significance for enhancing the mechanical strength, reliability and durability of materials, and reducing production costs. and other fields have broad application prospects. [0003] Since White et al first proposed the conc...

Claims

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Application Information

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IPC IPC(8): C08G83/00
Inventor 王小萍张雅莲贾德民
Owner SOUTH CHINA UNIV OF TECH
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