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

A free radical, responsive technology, applied in the field of force-responsive polymers, which can solve the problems of activating force-sensitive groups, limiting the scope of application, prone to aggregation and migration, etc.

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
Comparison scheme
Effect test

Embodiment 1

[0350]

[0351] Take 60 molar equivalents of methyl methacrylate, 0.1 molar equivalents of methyl 2-bromopropionate, and 1 molar equivalent of pentamethyldiethylenetriamine, dissolve them in an appropriate amount of tetrahydrofuran, blow nitrogen into it to remove oxygen for 30 minutes, and then add 1 molar equivalent of cuprous bromide, stirred and reacted at 80°C for 48 hours under an argon atmosphere, after the reaction was completed, purified to obtain bromine mono-capped polymethyl methacrylate PMMA-Br; then take 10 molar equivalents of PMMA-Br, 5 moles The equivalent compound (a) and 15 molar equivalents of sodium hydroxide are placed in a reaction vessel, an appropriate amount of tetrahydrofuran solvent is added, and the reaction is stirred at room temperature for 24 hours. After the reaction is completed, a linear polymer is purified; then a certain amount of purified polymer is obtained. , dissolved in an appropriate amount of furan to obtain a polymer solution with...

Embodiment 2

[0353]

[0354] Take 65 molar equivalents of styrene, 0.8 molar equivalents of 2-cyano-2-propyl dodecyl trithiocarbonate, and 0.35 molar equivalents of azobisisobutyronitrile, place them in a reaction vessel, and use an appropriate amount of dioxane The ring was dissolved, and stirred and reacted at 65°C for 24h under a nitrogen atmosphere to obtain polystyrene; then dissolved in DMF containing a small amount of water, stirred and reacted at 100°C for 20h to obtain mercapto-terminated polystyrene (a ); then take 2 molar equivalents of mercapto-terminated polystyrene (a), 1 molar equivalent of compound (b), and 2 molar equivalents of triethylamine, place them in a reaction vessel, dissolve them with an appropriate amount of tetrahydrofuran, stir and react for 3 hours, and finish the reaction , after purification and drying, a powdery solid can be obtained. Scratch or grind the resulting polymer powder vigorously, and its color will change from white to orange-red. The mecha...

Embodiment 3

[0356]

[0357] Take 0.9 molar equivalent of compound (a) and 1 molar equivalent of polytetrahydrofuran diol, place them in a reaction vessel, add an appropriate amount of dichloromethane solvent, and after the raw materials are dissolved, add 5 molar equivalents of dicyclohexylcarbodiimide, 1 molar equivalent 4-Dimethylaminopyridine, then stirred and reacted at room temperature for 24 hours, then added 0.25 molar equivalent of n-butyric acid, continued the reaction for 12 hours, and then removed the solvent to obtain a colloidal polymer. In this embodiment, the colloidal polymer can be stretched and stretched in a wide range, and it will turn orange during the stress deformation process, and the greater the stretch deformation, the darker the color. After the polymer sample is cut and placed in the mold, the sample can be repaired by pressing for a period of time by applying pressure; in addition, the sample can also be repaired by heating to 80°C or irradiating with ultrav...

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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 is of a non-crosslinked structure, and contains a reversible free radical type force-sensitive group. Under the action of mechanical force, the force-sensitive group is subjected to chemical fracture, force-induced responsiveness is obtained, the functions of warning, detecting, monitoring and the like of stress, deformation and damage of the polymer are achieved, and based on the reversible characteristic of force-induced response of the polymer, the polymer material can be endowed with good self-repairing performance. Free radicals generated by force-induced activation of the force-sensitive group can also react with active groupsin 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 intelligent sensor, a binding material, a plugging material and the like.

Description

technical field [0001] The invention relates to a mechanoresponsive polymer, in particular to a non-crosslinked mechanoresponsive polymer 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 value; some resea...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08G83/00
CPCC08J3/24C08G83/008
Inventor 不公告发明人
Owner 厦门天策材料科技有限公司
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