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Energy absorption method based on dynamic polymer

A polymer, dynamic technology for energy absorption

Inactive Publication Date: 2020-07-07
翁秋梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These structures for energy absorption are often a simple superposition of the above-mentioned mechanisms. Compared with the single above-mentioned mechanism, although the energy absorption range has been expanded to a certain extent and the energy absorption efficiency has been improved, its shortcomings cannot be avoided.

Method used

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  • Energy absorption method based on dynamic polymer
  • Energy absorption method based on dynamic polymer
  • Energy absorption method based on dynamic polymer

Examples

Experimental program
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Embodiment approach

[0337] In the present invention, each raw material / component of the dynamic polymer may have one, two or more than two glass transition temperatures, or may not have a glass transition temperature. Among them, in a preferred embodiment of the present invention, at least one of the glass transition temperatures of the raw materials / components of the dynamic polymer is higher than 100°C, more preferably all of them are higher than 100°C, which is convenient for preparation and has good dimensional stability . A high temperature resistant energy-absorbing material with excellent mechanical properties; in another preferred embodiment of the present invention, at least one of the raw materials / components of the dynamic polymer has a glass transition temperature between 25°C and 100°C, More preferably all of them are between 25°C and 100°C, which results in an energy-absorbing material containing at least one glass transition temperature between 25°C and 100°C; in another preferred e...

Embodiment 1

[0356]

[0357] Use hydroxy-terminated polyethylene glycol (PEG-2000) as the reactant and toluene as the solvent to chlorinate the terminal hydroxy group with thionyl chloride at 80°C; then use DMF as the solvent to react it with sodium azide, Azido-terminated polyethylene glycols are obtained. Take 1 molar equivalent of compound (a), 2 molar equivalents of 5-hexynoic acid, 0.5 molar single-quantity 4-dimethylaminopyridine, and 3 molar equivalents of dicyclohexylcarbodiimide, place them in a reaction vessel, and use an appropriate amount of two Chloromethane was dissolved, and then stirred at room temperature for 16 hours to obtain compound (b). Take 5 molar equivalents of compound (b), 5 molar equivalents of terminal azidopolyethylene glycol, 10 molar equivalents of cuprous bromide, and 10 molar equivalents of pentamethyldiethylenetriamine, place them in a reaction vessel, and dissolve them with tetrahydrofuran As a solvent, under a nitrogen atmosphere, stir the reaction ...

Embodiment 2

[0359]

[0360] Using methyl 2-bromopropionate as the initiator, cuprous bromide and pentamethyldiethylenetriamine as the catalyst system, bromine mono-terminated polymethacrylic acid was prepared from methyl methacrylate by ATRP reaction Methyl ester; then using tetrahydrofuran as a solvent, the above-mentioned polymethyl methacrylate and excess sodium azide were reacted at room temperature for 24 hours to obtain azido-single-terminated polymethyl methacrylate; take 15 molar equivalents of azide Polymethyl methacrylate, 7.5 molar equivalents of diacetylenyl compound (a), 75 molar equivalents of pentamethyldiethylenetriamine, are placed in a reaction vessel, dissolved with an appropriate amount of tetrahydrofuran, and nitrogen gas Bubble deoxygenation for 30 minutes, then add 60 molar equivalents of copper powder and 15 molar equivalents of cuprous bromide, under nitrogen atmosphere, stir and react at room temperature for 5 hours, pour the resulting product into a mold, and ...

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Abstract

The invention discloses an energy absorption method based on a dynamic polymer. According to the energy absorption method, the dynamic polymer is adopted for energy absorption. The dynamic polymer contains reversible free radical type dynamic covalent bonds and optional hydrogen bonds. Based on the dynamic covalence of the dynamic covalent bonds and the supramolecular dynamics of the hydrogen-bondinteraction, a good energy absorption effect can be provided for the polymer, and energy absorption functions such as damping, shock absorption, sound insulation, noise reduction and impact resistance are obtained. Besides, based on the dynamics of the dynamic covalent bonds and the hydrogen bonds, self-repairing performance can be provided when the energy absorbing material is structurally damaged, a more effective energy absorbing protection effect is provided for a protected object, and a recyclable energy absorption material can be obtained easily. The energy absorption material can be applied to body protection in daily life, sports and work, military police body protection, impact resistance protection of electronic products, explosion prevention, airborne landing and airdrop protection, automobile collision prevention, noise reduction and the like.

Description

technical field [0001] The invention relates to an energy absorbing method, in particular to an energy absorbing method based on a dynamic polymer. Background technique [0002] In daily life, sports, entertainment, military, police, security, medical care, production and other activities, human bodies, animal bodies and objects are often severely affected by physical shocks such as impacts, vibrations, shocks, explosions, and sounds. In order to alleviate and eliminate the impact of this physical impact, it is necessary to use energy-absorbing methods and energy-absorbing materials for energy-absorbing protection. The existing energy absorption methods mainly include active energy absorption and passive energy absorption. The former is a method including the use of shock absorbers to absorb energy, and the latter is to use materials with energy-absorbing functions. The materials used for energy absorption mainly include metals, polymers, composite materials and other mate...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08G83/00
CPCC08G83/008C08J3/24
Inventor 不公告发明人
Owner 翁秋梅
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