Shape memory intrinsic type self-repairing material as well as preparation method and application thereof

A self-healing material and intrinsic type technology, applied in the field of intelligent polymer materials, can solve problems such as the depletion of repairing agent, and achieve the effect of high repair rate, simple repair process, and high repair efficiency

Active Publication Date: 2016-07-27
SUN YAT SEN UNIV
4 Cites 36 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, these two types of self-repair methods have their own limitations. The explanted repair method uses microcapsules and hollow fibers to encapsulate the repair agent, so there is a problem of exhaustion of the repair agent; in contrast, the intrinsic self-repair method Repair mos...
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Abstract

The invention provides a shape memory intrinsic type self-repairing material which is prepared from the following components: a crystal polyether or polyester diol monomer, a diisocyanate monomer, a monomer containing a dynamic covalent bond micromolecule chain extender, a rubber elastic body, a free radical polymeric ultraviolet light initiator, a multi-sulfydryl curing agent and conductive packing. If the shape memory intrinsic type self-repairing material is suffered from mechanical damage, a conductive path consisting of internal conductive packing is damaged, the resistance of the material is increased, under the action of external current, temperature rise can be resulted from the Joule heating effect of the material self, a reversible shape memory effect of the material can be excited, cracks of the material can be shrunk and closed, meanwhile after macroscopic cracking closure, the dynamic covalent bonds inside the material can recombine the material as molecular chains of a fracture surface are diffused with one another and subjected to reversible chemical reaction, at the moment, paths of the conductive packing in the material can be recovered, the resistance of the material can be reduced to an original level, the Joule heating effect can be eliminated, the temperature can be reduced to the room temperature, and the self-repairing process has the characteristics of reversibility and repeatability.

Technology Topic

Self-healing materialChemistry +14

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  • Shape memory intrinsic type self-repairing material as well as preparation method and application thereof
  • Shape memory intrinsic type self-repairing material as well as preparation method and application thereof
  • Shape memory intrinsic type self-repairing material as well as preparation method and application thereof

Examples

  • Experimental program(20)
  • Comparison scheme(2)

Example Embodiment

[0036] Example 1
[0037] Add 15 parts of polyε-caprolactone diol monomer with a number average molecular weight of 1500 and 3.5 parts of hexamethylene diisocyanate into a 250ml three-neck flask with mechanical stirring, and react at 65°C with tetrahydrofuran as a solvent Add 4.3 parts of styrene-butadiene-styrene block copolymer and 1 part of multi-walled carbon nanotubes with a diameter of 10-20nm for 1h, stir at 65℃ for 1h, and then add 3 parts of 2-(4-hydroxyl -2,2,6,6-Tetramethylpiperidine-1-oxy)-N-(2-hydroxyethyl)-2-methylpropionamide, 0.1 part of 2-methyl-1-(4-methyl Thiophenyl)-2-morpholinyl-1-acetone and 0.7 parts of trimethylolpropane tris(3-mercaptopropionic acid) ester were reacted at 65°C for 0.5h. The resulting mixed solution was sonicated for 10min and poured into a rectangle In the mold, the tetrahydrofuran was removed at 60°C to form a sheet with a thickness of about 1 mm. The obtained rectangular sheet was heated to 60°C and stress was applied to make the rectangular sheet strain up to 500% in the longitudinal direction. The strain was maintained at 500% and quickly cooled to room temperature. After curing, it was cured by ultraviolet light with a wavelength of 254nm for 1h, and then heated to 60°C after curing. The strain recovers, and the material is obtained by cooling to room temperature.

Example Embodiment

[0038] Example 2
[0039] Add 20 parts of polyε-caprolactone diol monomer with a number average molecular weight of 2000 and 3.5 parts of hexamethylene diisocyanate into a 250ml three-necked flask with mechanical stirring, and react at 65°C with tetrahydrofuran as a solvent 1h, add 5.3 parts of styrene-butadiene-styrene block copolymer and 1.2 parts of multi-walled carbon nanotubes with a diameter of 10-20nm, stir at 65℃ for 1h, and then add 3 parts of 2-(4-hydroxyl -2,2,6,6-Tetramethylpiperidine-1-oxy)-N-(2-hydroxyethyl)-2-methylpropionamide, 0.1 part of 2-methyl-1-(4-methyl Thiophenyl)-2-morpholinyl-1-acetone and 0.7 parts of trimethylolpropane tris(3-mercaptopropionic acid) ester were reacted at 65°C for 0.5h. The resulting mixed solution was sonicated for 10min and poured into a rectangle In the mold, the tetrahydrofuran was removed at 60°C to form a sheet with a thickness of about 1 mm. The obtained rectangular sheet was heated to 60°C and stress was applied to make the rectangular sheet strain up to 500% in the longitudinal direction. The strain was maintained at 500% and quickly cooled to room temperature. After curing, it was cured by ultraviolet light with a wavelength of 254nm for 1h, and then heated to 60°C after curing. The strain recovers, and the material is obtained by cooling to room temperature.

Example Embodiment

[0040] Example 3
[0041] Add 30 parts of polyε-caprolactone diol monomer with a number average molecular weight of 3000 and 3.5 parts of hexamethylene diisocyanate into a 250ml three-neck flask with mechanical stirring, and react at 65°C with tetrahydrofuran as a solvent 1h, add 7.3 parts of styrene-butadiene-styrene block copolymer and 1.7 parts of multi-walled carbon nanotubes with a diameter of 10-20nm, stir at 65℃ for 1h, and then add 3 parts of 2-(4-hydroxyl -2,2,6,6-Tetramethylpiperidine-1-oxy)-N-(2-hydroxyethyl)-2-methylpropionamide, 0.1 part of 2-methyl-1-(4-methyl Thiophenyl)-2-morpholinyl-1-acetone and 0.7 parts of trimethylolpropane tris(3-mercaptopropionic acid) ester were reacted at 65°C for 0.5h. The resulting mixed solution was sonicated for 10min and poured into a rectangle In the mold, the tetrahydrofuran was removed at 60°C to form a sheet with a thickness of about 1 mm. The obtained rectangular sheet was heated to 60°C and stress was applied to make the rectangular sheet strain up to 500% in the longitudinal direction. The strain was maintained at 500% and quickly cooled to room temperature. After curing, it was cured by ultraviolet light with a wavelength of 254nm for 1h, and then heated to 60°C after curing. The strain recovers, and the material is obtained by cooling to room temperature.

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