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Force-induced responsive cross-linked polymer with multiple networks

A technology of cross-linked polymers and responsiveness, which is applied in the field of mechano-responsive cross-linked polymers, mechano-responsive cross-linked polymers and their realization of mechano-response, which can solve the problem of limited improvement of mechanical strength and non-responsive mechanical force Sex, gel materials can not provide strength 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] The cross-linking of polymers is an important factor to obtain good mechanical strength and structural stability. Traditional cross-linked polymer materials usually only contain a single cross-linked network structure, which can improve the mechanical strength of the material to a certain extent, but the improvement of mechanical strength Still very limited, and a single network does not provide enough strength for gel-like materials
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 structural damage such as micro-cracks / cracks, which cannot be used to determine the impact of the material. Force, deformation, structural damage and failure processes provide monitoring and warning
[0003] At present, most mechanoresponsive polymers require high stress / strain for mechanoresponse, and the mechanoresponse process can only occur after the material fails, which cannot really give full play to the effective early warning of material structure damage. The practical significance of improving the safety of material use is not great

Method used

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  • Force-induced responsive cross-linked polymer with multiple networks
  • Force-induced responsive cross-linked polymer with multiple networks
  • Force-induced responsive cross-linked polymer with multiple networks

Examples

Experimental program
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preparation example Construction

[1780] In the preparation process of the polymer, three methods of mechanical foaming, physical foaming and chemical foaming are mainly used to foam it.

[1781] 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.

[1782] 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

[1799]

[1800] Using triethylamine as a catalyst and dichloromethane as a solvent, a distyryl-sensitizing group cross-linking agent is prepared by reacting the sensitizing group diol (a) with excess 4-vinyl benzoyl chloride. Take 80 molar equivalents of styrene, 1 molar equivalent of the above-mentioned force-sensitive group crosslinking agent, 5 molar equivalents of divinylbenzene, and 5 wt% BPO, put them in a reaction vessel, dissolve them with an appropriate amount of toluene, and stir the reaction at 70°C under a nitrogen atmosphere After 24h, a single-network styrene was obtained. Then take 80 molar equivalents of styrene, 3 molar equivalents of divinylbenzene, 5wt% BPO, and 80wt% single-network styrene, place them in a reaction vessel, fully swell with an appropriate amount of toluene, and stir the reaction at 70°C under a nitrogen atmosphere After 24 hours, the product was poured into a mold, and the solvent was removed at 60°C to obtain a common solid. The solid m...

Embodiment 2

[1802]

[1803] Take 3.5 molar equivalents of polylactide diol (molecular weight: 5000), 1 molar equivalent of alkoxyamine dibromide (a), and 3 molar equivalents of 1,3,5-tris(bromomethyl)benzene, and dissolve them with an appropriate amount of DMF Finally, add 18 molar equivalents of sodium hydroxide catalyst, then stir the reaction at 50°C for 24 hours, remove impurities and solvent after the reaction is completed, and obtain single-network polylactide. Take 9 molar equivalents of polylactide diol (molecular weight is 5000), 36 molar equivalents of triethylamine, 50wt% single-network polylactide, fully swell with an appropriate amount of dichloromethane, cool in an ice bath for 30 minutes, then stir and drop into the solution There are 6 molar equivalents of 1,3,5-dichloromethane solution of benzenetricarboxylic acid chloride, after the dropwise addition is completed, stir and react at room temperature for 6h, then add 5wt% nano silver, 0.6wt% dibutyltin dilaurate, 0.3wt% ...

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Abstract

The invention discloses a force-induced responsive cross-linked polymer with multiple networks. The force-induced responsive cross-linked polymer comprises at least two cross-linked networks and a force-sensitive group, wherein the cross-linking degree of non-dynamic covalent bond covalent cross-linking in at least one cross-linked network is above the gel point; under the action of mechanical force, the force-sensitive group is subjected to chemical and / or physical changes, and force-induced response is achieved. The multi-network structure provides good structural stability and mechanical properties for the polymer; based on the force-induced responsiveness of the force-sensitive group, detection, monitoring and warning effects can be provided for the stress, deformation, structural damage and failure processes of the polymer. The force-induced responsive polymer contains at least two force-sensitive groups, so that rich force-responsive properties can be obtained. The force-inducedresponsive cross-linked 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 present invention relates to a mechanoresponsive crosslinked polymer and a method for realizing mechanoresponse, in particular to a mechanoresponsive crosslinked polymer having a multi-network structure and containing a mesosensitive group and realizing the mechanoresponse A Mechanogenetic Response Approach for Responsive Crosslinked Polymers. Background technique [0002] The cross-linking of polymers is an important factor to obtain good mechanical strength and structural stability. Traditional cross-linked polymer materials usually only contain a single cross-linked network structure, which can improve the mechanical strength of the material to a certain extent, but the improvement of mechanical strength Still very limited, and a single network does not provide enough strength for gel-like materials. In addition, traditional cross-linked polymer materials are not responsive to mechanical force, and can only be observed and detected when the mec...

Claims

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Application Information

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IPC IPC(8): C08J3/24
CPCC08J3/243
Inventor 不公告发明人
Owner 厦门天策材料科技有限公司
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