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Intrinsic room-temperature self-repairing crystalline polymer

A crystalline polymer, self-repair technology, applied in organic chemistry and other fields, to achieve the effect of simple structure, short repair time and high repair rate

Inactive Publication Date: 2015-03-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the polymer materials that can realize intrinsic self-healing at room temperature are mainly elastomers or gel materials, and the T g The lower the molecular weight, the stronger the mobility of molecules at room temperature, and the effective breaking and rebonding of reversible bonds, while the covalent bond self-repairing of hard polymer structural materials (such as crystalline polymers) at room temperature has not yet been reported.

Method used

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  • Intrinsic room-temperature self-repairing crystalline polymer
  • Intrinsic room-temperature self-repairing crystalline polymer
  • Intrinsic room-temperature self-repairing crystalline polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Under the protection of high-purity argon, add 200mL of benzene solution containing 2.5 parts of 4,4'-azobis(4-cyanopentanol) and 1.2 parts of 4-OH-TEMPO into the In a three-neck flask with a magnetic stirrer, stir and reflux at 80°C for 3h. After the reaction, the system was cooled to room temperature, and the solvent benzene was distilled off under reduced pressure to obtain a light yellow viscous liquid. Purified by silica gel chromatography, the eluent was petroleum ether / ethyl acetate=5:3 (v / v), collected the corresponding eluent and evaporated the solvent under reduced pressure to obtain a light yellow viscous liquid, which was purified with ethyl acetate / n-hexane Alkanes are further precipitated and purified to obtain 5-hydroxyl-2-(4-hydroxyl-2,2,6,6-tetramethylpiperidine-1-oxygen)-2-methyl-valeronitrile (abbreviated as: 4-cyano -(4-OH-TEMPO)-pentanol), the molecular structure is shown below. The IR spectrum and H NMR spectrum of the molecule are shown in figu...

Embodiment 2

[0036] 40 parts of polyethylene glycol PEG2000 (the number average molecular weight is 2000), 5.7 parts of the compound obtained in Example 1, (4-cyano-(4-OH-TEMPO)-pentanol) were added to the In a 250ml three-necked flask, heat up to 60°C to melt PEG2000, add 9.2 parts of isophorone diisocyanate monomer and 0.05 part of dibutyltin dilaurate catalyst, react at 80°C for 30 minutes and pour into a silica gel mold, argon The atmosphere was placed in an oven at 80°C to react for 24 hours, and then cooled and crystallized to obtain a crystalline linear polyurethane containing alkoxyamine. After the material was scratched or micro-cracks occurred, the cross-section was simply touched and repaired at room temperature in nitrogen for 24 hours. -48h, the crack can be repaired.

Embodiment 3

[0038] Add 120 parts of PEG2000 (the number average molecular weight is 2000), 5.7 parts of the compound obtained in Example 1, (4-cyano-(4-OH-TEMPO)-pentanol) to a 250ml three-necked In the flask, heat up to 60°C to melt PEG2000, add 18.4 parts of isophorone diisocyanate monomer and 0.14 parts of dibutyltin dilaurate catalyst, react at 80°C for 30 minutes, pour into a silica gel mold, and place in an oven under an argon atmosphere React at 80°C for 24 hours, and then cool and crystallize to obtain a crystalline linear polyurethane containing alkoxyamine. After the material is scratched or has microcracks, simply touch the cross-section and repair it in the air at room temperature for 24-48 hours, that is Cracks can be repaired.

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Abstract

The invention relates to an intrinsic room-temperature self-repairing crystalline polymer, which comprises the following components: micromolecule divalent alcohol monomer containing alcoxyl amine group, crystalline polyether or polyester-diol monomer and diisocyanate or triisocyanate monomer. The self-repairing functional material can joint rupture surfaces after being mechanically damaged, and can restore most mechanical properties after being placed at the temperature of 15-25 DEG C for a period time of self-repairing. The repairing mechanism of the intrinsic room-temperature self-repairing crystalline polymer lies in reversible C-ON preferred fracturing, and after re-junction of the fracture surfaces, molecular chains are mutually diffused, and then the carbon free radical and NO free radical at the ends of the molecular chains are combined. The intrinsic self-repairing material presents the characteristics of a rigid solid material, has the characteristics of simplicity in preparation, room-temperature self-repairing performance, high repairing efficiency, short repair time, capability of realizing repeated repair and the like, facilitates prolonging the service life of the polymer material and conforms to the development tendency of global low-carbon economy.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to an intrinsic room temperature self-healing crystalline polymer. Background technique [0002] During the processing and use of polymer structural materials, microcracks and local damage will inevitably occur inside them. These microscopic defects are likely to cause local stress concentration in the material, making the area reach the breaking strength value of the material in advance, resulting in the propagation of microcracks. , resulting in a macroscopic fracture of the material as a whole. Inspired by the self-healing of biological damage, the synthesis of polymers and polymer composites with biomimetic self-healing functions has become an emerging research field. This kind of intelligent system can automatically or under the stimulation of external conditions (such as heat and light) heal micro-damages inside and outside the material, improve the long-term stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/76C08G18/79C08G18/66C08G18/42C08G18/48C08G18/32C07D211/94
Inventor 张泽平章明秋容敏智
Owner SUN YAT SEN UNIV
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