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Force-induced responsive polymer based on reversible free radical type force-sensitive group

A technology of free radicals and polymers, applied in the field of force-responsive polymers based on reversible free-radical force-sensitive groups, can solve the problem of poor processing performance and use stability, activation of force-sensitive groups, and no use value, etc. question

Pending Publication Date: 2020-07-07
厦门天策材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many research teams have prepared many small organic molecules with strong responsiveness, but due to their generally poor mechanical strength, poor processing performance and use stability, they often have no practical use value; some research teams will These mechanoresponsive small molecules are introduced into the polymer by blending / doping to prepare a polymer material with certain mechanoresponsiveness. However, this form of physical dispersion cannot provide a Good dispersion stability, and cannot transmit mechanical force well and activate mechanosensitive groups, and cannot activate mechanoresponsive small molecules to exert mechanoresponse effect
In addition, the mechanoresponsive polymer prepared in the form of physical dispersion is prone to aggregation and migration after the mechanoresponse occurs, and the reversibility of the mechanoresponse process is poor.
These problems greatly limit the scope of its application

Method used

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  • Force-induced responsive polymer based on reversible free radical type force-sensitive group
  • Force-induced responsive polymer based on reversible free radical type force-sensitive group
  • Force-induced responsive polymer based on reversible free radical type force-sensitive group

Examples

Experimental program
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preparation example Construction

[0305] In the preparation process of the polymer, three methods of mechanical foaming, physical foaming and chemical foaming are mainly used to foam it.

[0306] Among them, the mechanical foaming method is to introduce a large amount of air or other gases into the emulsion, suspension or solution of the polymer with the help of strong stirring during the preparation of the polymer to make it a uniform foam, and then through physical or Chemical changes shape it into foam. In order to shorten the molding cycle, air can be introduced and emulsifiers or surfactants can be added.

[0307] Wherein, the physical foaming method is to use physical principles to realize the foaming of the polymer during the preparation of the polymer, which includes but is not limited to the following methods: (1) inert gas foaming method, that is, under pressure Under normal circumstances, the inert gas is pressed into the molten polymer or pasty material, and then the pressure is reduced and the te...

Embodiment 1

[0320]

[0321] Using triethylamine as a catalyst, hydrogenated carboxyl-terminated polybutadiene is prepared by reacting hydrogenated hydroxyl-terminated polybutadiene with excess succinic anhydride. Take 5 molar equivalents of compound (a), 10 molar equivalents of hydrogenated carboxy-terminated polybutadiene, put them in a reaction vessel, dissolve them with an appropriate amount of tetrahydrofuran, then add 30 molar equivalents of dicyclohexylcarbodiimide, 5 molar equivalents of 4- Dimethylaminopyridine was stirred and reacted at room temperature for 48 hours. After the reaction was completed, the reactant was poured into a mold and dried naturally to obtain a polymer film at last. The thin film material has the characteristics of oil resistance, water resistance, bending resistance, etc., after rubbing it, it can emit light yellow fluorescence under 380nm ultraviolet light. The polymer film material in this embodiment can be used as an anti-counterfeiting coating mater...

Embodiment 2

[0323]

[0324] Take 5 molar equivalents of hydroxyl-terminated four-armed polyethylene glycol (molecular weight is 4000), 12 moles of single-quantity pinacol derivatives (a), put them in a reaction vessel, dissolve them with an appropriate amount of tetrahydrofuran, and then add 36 molar equivalents of bicyclic Hexylcarbodiimide, 6 molar equivalents of 4-dimethylaminopyridine, then stirred and reacted at room temperature for 24 hours, then added 4 molar equivalents of n-butanol, continued the reaction for 12 hours, then added 3 parts of liquid metal gallium, 0.5 parts of nano-silver to disperse liquid, 0.1 part of sodium dodecylsulfonate, and 150 parts of distilled water, after mixing evenly, pour the mixture into a mold, and place it in a vacuum oven at 50°C for 6 hours. After the tetrahydrofuran is completely volatilized, a polymer object hydrogel. The gel sample will turn yellow-green under stretching, because the mesensitized group in it is activated by force to genera...

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Abstract

The invention discloses a force-induced responsive polymer based on a reversible free radical type force-sensitive group. The force-induced responsive polymer contains a reversible free radical type force-sensitive group, and the polymer is covalently cross-linked by the force-sensitive group; under the action of mechanical force, the force-sensitive group is subjected to chemical fracture, force-induced responsiveness is obtained, and the functions of warning, detecting, monitoring and the like on stress, deformation and damage of the polymer are achieved; and based on the reversible characteristic of force-induced response of the force-sensitive group, the polymer material can be endowed with good self-repairing performance, reprocessability, recoverability and the like. Free radicals generated by force-induced activation of the force-sensitive group can also react with active groups in the polymer, so that the structural stability is improved, and a self-enhancement effect is achieved. The force-induced responsive polymer can be widely applied to a stress sensing material, a self-repairing material, a tough material, a toy material, a functional coating material, an intelligentsensor, a binding material, a plugging material and the like.

Description

technical field [0001] The invention relates to a mechanoresponsive polymer, in particular to a mechanoresponsive polymer with a cross-linked structure based on a reversible free radical mechanosensitive group. Background technique [0002] Traditional polymer materials do not have mechanoresponsiveness. Under the action of mechanical force, they cannot play an early warning role for internal structural damage. They are often discovered after the material has completely failed, which is likely to cause great loss of personnel and property. It is particularly important to design polymer materials that respond specifically to mechanical forces to warn and monitor the damage and failure of materials to improve the safety of polymer materials. At present, many research teams have prepared many small organic molecules with strong responsiveness, but due to their generally poor mechanical strength, poor processing performance and use stability, they often have no practical use val...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L47/00C08L71/02C08K3/08C08L33/08C08L15/02C08L83/05C08L67/04C08L15/00C08J5/18C08J3/075C08K5/00C08K5/43C08K5/56C08K5/315C08K5/3415
CPCC08J3/24C08J5/18C08J3/075C08J3/246C08J2347/00C08J2371/02C08J2333/08C08J2471/02C08J2315/02C08J2383/05C08J2367/04C08J2315/00C08K2201/011C08K2003/0806C08K5/0025C08K5/43C08K5/56C08K5/315C08K5/3415
Inventor 不公告发明人
Owner 厦门天策材料科技有限公司
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