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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 mostly relies on the reversible chemical reaction of its own chemical bonds (covalent bonds, non-covalent bonds) to achieve repeated repairs to material microcracks, but requires that the two fractured surfaces generated by material fractures be close enough to interact to repair the matrix

Method used

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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
Comparison scheme
Effect test

Embodiment 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-necked flask with mechanical stirring, and react at 65°C with tetrahydrofuran as a solvent 1h, add 4.3 parts of styrene-butadiene-styrene block copolymer and 1 part of multi-walled carbon nanotubes with a diameter of 10-20nm, stir at 65°C for 1h, then add 3 parts of 2-(4-hydroxy -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-propanone and 0.7 parts of trimethylolpropane tris(3-mercaptopropionate) were reacted at 65°C for 0.5h, and the resulting mixed solution was ultrasonicated for 10min and then poured into a rectangle Molds were stripped of THF at 60°C to form approximately 1 mm thick sheets. Heat the obtained rectangular sheet to 60°C and apply stress to make the longitudinal strain of the rectangular sheet reach 500%, ...

Embodiment 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°C for 1h, then add 3 parts of 2-(4-hydroxy -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-propanone and 0.7 parts of trimethylolpropane tris(3-mercaptopropionate) were reacted at 65°C for 0.5h, and the resulting mixed solution was ultrasonicated for 10min and then poured into a rectangle Molds were stripped of THF at 60°C to form approximately 1 mm thick sheets. Heat the obtained rectangular sheet to 60°C and apply stress to make the longitudinal strain of the rectangular sheet reach 500...

Embodiment 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-necked 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°C for 1h, then add 3 parts of 2-(4-hydroxy -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-propanone and 0.7 parts of trimethylolpropane tris(3-mercaptopropionate) were reacted at 65°C for 0.5h, and the resulting mixed solution was ultrasonicated for 10min and then poured into a rectangle Molds were stripped of THF at 60°C to form approximately 1 mm thick sheets. Heat the obtained rectangular sheet to 60°C and apply stress to make the longitudinal strain of the rectangular sheet reach 500...

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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.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, and more specifically relates to an intrinsic self-healing composite material with shape memory and its preparation method and application. Background technique [0002] During the processing and use of polymer materials, cracks and local damage will inevitably occur inside them. Therefore, the synthesis of polymers and polymer composites with biomimetic self-healing functions has become an emerging research field. The core of self-repair is energy supply and material supply, imitating the principle of biological damage healing, so that composite materials can self-repair internal and external damage, thereby eliminating hidden dangers, enhancing the mechanical strength of materials, and prolonging service life. Industry, aerospace, electronics, bionics and other fields are particularly important. At present, self-healing materials can be divided into two categories: explant type and...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08L75/08C08L11/00C08L9/02C08L53/02C08K7/24C08K3/04C08K3/22C08G18/48C08G18/42
CPCC08G18/4277C08G18/4833C08G18/4854C08L75/06C08L75/08C08L2201/12C08K2201/011
Inventor 范龙飞章明秋容敏智陈旭东
Owner SUN YAT SEN UNIV
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