Force-induced responsive polymer with single hybrid network structure

A network structure and responsive technology, applied in the field of mechano-responsive polymers, mechano-responsive polymers and their realization, can solve the problem of inability to obtain self-healing performance, poor material toughness, inability to monitor and warn materials Function and other issues

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[1740] 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

[1757]

[1758] Take 3 molar equivalents of carboxy-terminated four-armed polyethylene glycol (molecular weight is 2000), 15 molar equivalents of N-hydroxysuccinimide, and 15 molar equivalents of dicyclohexylcarbodiimide, place them in a reaction vessel, and add an appropriate amount of tetrahydrofuran Dissolve, under a nitrogen atmosphere, stir and react at room temperature for 12 hours, then add 3 moles of compound (a) and 3 moles of compound (b), continue stirring and reacting at room temperature for 24 hours, remove impurities and solvents after the reaction, and obtain cross-linked polymer and then swell 40g of the purified product in a large amount of purple litmus aqueous solution, and after reaching the swelling equilibrium, a polymer hydrogel can be obtained. The measured tensile strength of the gel was 1.68 MPa, and the elongation at break was 955%. When stretching the gel, as the stretching deformation increases, the gel will gradually turn red, and the gel will ...

Embodiment 2

[1760]

[1761] Take 0.5 molar equivalents of pendant carboxypolysiloxane (a), 10 moles of compound (b), 5 moles of compound (c), and 30 moles of compound (d), place them in a reaction vessel, and use an appropriate amount of Dissolved acetonitrile, then added 60 molar equivalents of dicyclohexylcarbodiimide and 20 molar equivalents of 4-dimethylaminopyridine, then stirred and reacted at room temperature for 36 hours, then placed the product in a mold, and placed it in a vacuum oven at 90°C After drying for 6 hours, and then slowly cooling down to room temperature, a polymer elastomer can be obtained. Under the action of mechanical force, the non-covalent mesosensitive group in the elastomer is activated by force, causing a change in fluorescence; and the triarylsulfide series mesosensitive group can generate phenyl cations after being activated by force, and combine with the side group The nucleophilic secondary amino group reacts to obtain cross-linking, which is benefici...

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Abstract

The invention discloses a force-induced responsive polymer with a single hybrid network structure. Only one cross-linked network is contained, non-dynamic covalent bond covalent cross-linking and non-covalent cross-linking are contained at the same time, the cross-linking degree of the non-dynamic covalent bond covalent cross-linking is above a gel point, and the cross-linked network contains at least two force-sensitive groups; under the action of mechanical force, the force-sensitive groups are subjected to chemical and/or physical changes, and force-induced response is achieved. The singlehybrid network structure provides good structural stability and mechanical properties for the polymer; based on the force-induced responsiveness of the force-sensitive groups, the detection, monitoring and warning effects on the stress, deformation, damage and failure processes are obtained; 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 and a method for realizing the mechanoresponse, in particular to a mechanoresponsive polymer having a single heterogeneous network structure and containing at least two mechanosensitive groups and the realization of the mechanoresponsive A Mechanogenetic Response Approach for Responsive Polymers. 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 mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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