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Force-induced responsive polymer with single hybrid network structure

A network structure and polymer technology, applied in the field of mechanoresponsive polymers, can solve problems such as inability to effectively prevent expansion, non-responsive mechanical force, and poor material toughness.

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

[0002] Polymer cross-linking is an important factor to obtain good mechanical strength and structural stability. The cross-linking effect includes physical cross-linking and chemical cross-linking. Traditional cross-linked polymer materials usually only contain a single cross-linked network structure. The degree can improve the mechanical strength of the material, but for polymers containing only physical cross-linking, the bonding effect is relatively weak, showing a certain reversibility, which can increase the toughness, tear resistance, fatigue resistance and self-repair of the material Performance, etc., but it is precisely because of the reversibility of this cross-linked structure that it is susceptible to external environmental influences, such as acid resistance, alkali resistance, salt ion resistance, temperature resistance, etc., which cannot provide long-term stability.
Although traditional chemical cross-linked polymers can maintain high mechanical strength and long-term use stability, due to the strong bonding effect of their structure, the toughness of the material is poor, and silver cracks / microcracks are generated inside the material, which cannot effectively prevents it from expanding, and cannot achieve self-healing properties after damage to the material
In addition, traditional cross-linked polymer materials are not responsive to mechanical force, and can only be observed and detected when the mechanical force reaches the fracture threshold of the chemically connected structure and produces microcracks / cracks, which cannot be used for stress and deformation of the material. , damage and failure process provide monitoring and warning functions, and cannot effectively repair structural damage

Method used

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  • Force-induced responsive polymer with single hybrid network structure
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  • Force-induced responsive polymer with single hybrid network structure

Examples

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Embodiment approach

[1917] In the present invention, the mechanoresponsive 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 mechanoresponsive polymer is higher than 100°C, more preferably all of them are higher than 100°C, and the size of the resulting mechanoresponsive polymer Stability, mechanical strength, and high temperature resistance are good, and are suitable for application scenarios with high requirements for stress bearing and rigidity; in another preferred embodiment of the present invention, the glass transition temperature of the mechanoresponsive polymer is at least One of them is between 25 and 100°C, more preferably all of them are between 25 and 100°C, which is convenient for preparing polymer products in the form of ordinary solids, foams, and gels above room temperature, and is suitable ...

Embodiment 1

[1934]

[1935] Toluene is used as solvent, hydrogen-containing polysiloxane (a) (40% silicon-hydrogen bond content) and 4-acrylamidobutyric acid are used as raw materials, and xylene solution of Karstedt catalyst is used as catalytic system, and stirred at 85°C After 10 hours of reaction, polysiloxane (b) was obtained. Take 0.2 molar equivalents of polysiloxane (b) and 5 molar equivalents of compound (c), place them in a reaction vessel, dissolve them with an appropriate amount of dichloromethane, then add 25 molar equivalents of diisopropylcarbodiimide, 2.5 molar equivalents 4-Dimethylaminopyridine, stirred and reacted at room temperature for 16 hours, after the reaction was completed, impurities and solvents were removed to obtain a purified product; 15 g of the obtained product was swollen in 100 mL of ethanol, and then 20 mL of 0.2 g / mL zinc dichloride was added dropwise under stirring After the dropwise addition, 10 mL of triethylamine was added, stirred at room tempe...

Embodiment 2

[1937]

[1938] Using triethylamine as a catalyst and dichloromethane as a solvent, react compound (a) with excess acryloyl chloride to prepare diacrylate (b); take 5 molar equivalents of compound (b), 90 molar equivalents of compound (c ), 25 molar equivalents of compound (d), and 0.2 molar equivalents of AIBN were placed in a reaction vessel, dissolved with an appropriate amount of toluene, and then stirred and reacted at 70°C for 24 hours under a nitrogen atmosphere. After the reaction was completed, the product was placed in a mold, and Dry in a vacuum oven at 100°C for 6 hours, and then slowly cool down to room temperature to obtain a common solid polymer. Gradient changes in the mechanical strength and modulus of the polymer can be achieved by controlling the incident light intensity and the irradiation position, so that the polymer can have a gradual mechanochromic effect under the same mechanical force, which can be used as a stress warning Material.

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Abstract

The invention discloses a force-induced responsive polymer with a single hybrid network structure. The force-induced responsive polymer only contains one cross-linked network, and simultaneously contains non-dynamic covalent bond covalent cross-linking and non-covalent cross-linking, wherein the cross-linking degree of the non-dynamic covalent bond covalent cross-linking is above a gel point, andthe cross-linked network contains a force-sensitive group; under the action of mechanical force, the force-sensitive group is subjected to chemical and / or physical changes, and force-induced responseis achieved. The single hybrid network structure provides good structural stability and mechanical properties for the polymer; based on the force-induced responsiveness of the force-sensitive group, the detection, monitoring and warning effects on the stress, deformation, damage and failure processes are obtained; and the non-covalent dynamics of the non-covalent cross-linking may provide self-healing performance. The force-induced responsive polymer can be applied to a stress sensing material, a self-repairing material, a tough material, a shape memory 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 mechanoresponsive polymer with a single heteronetwork structure and a mechanosensitive group. Background technique [0002] Polymer cross-linking is an important factor to obtain good mechanical strength and structural stability. The cross-linking effect includes physical cross-linking and chemical cross-linking. Traditional cross-linked polymer materials usually only contain a single cross-linked network structure. The degree can improve the mechanical strength of the material, but for polymers containing only physical cross-linking, the bonding effect is relatively weak, showing a certain reversibility, which can increase the toughness, tear resistance, fatigue resistance and self-repair of the material Performance, etc., but it is precisely because of the reversibility of this cross-linked structure that it is susceptible to external environmental influences, such as acid resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L83/04C08L87/00C08G77/388C08G83/00
CPCC08J3/24C08G77/388C08G83/008C08J2383/04C08J2387/00
Inventor 不公告发明人
Owner 厦门天策材料科技有限公司
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