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Preparation method of supramolecular hydrogel capable of being stretched in ultra-long mode

A supramolecular hydrogel and hydrogel technology, applied in the field of functional polymer materials, can solve the problems of gel network rupture and poor mechanical properties, and achieve the effects of excellent electrical conductivity, excellent adhesion, and excellent self-healing.

Pending Publication Date: 2022-02-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most gels undergo irreversible network breakdown due to chemical crosslinking, making them mechanically poor materials

Method used

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  • Preparation method of supramolecular hydrogel capable of being stretched in ultra-long mode
  • Preparation method of supramolecular hydrogel capable of being stretched in ultra-long mode
  • Preparation method of supramolecular hydrogel capable of being stretched in ultra-long mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) After 10 grams of polyethylene glycol was weighed and melted completely at 50°C, 0.08 grams of catalyst boron trifluoride ether was added, and 2.775 milliliters of epichlorohydrin was added dropwise at a speed of 0.5 mL / min, and the reaction was carried out for 4 hours. After completion of the reaction, excess epichlorohydrin was removed by distillation to obtain epoxy-modified polyethylene glycol.

[0034] 2) Disperse the lignosulfonate in 0.1M sodium hydroxide solution to prepare a dispersion liquid with a mass fraction of 25%, mix with the epoxy-modified polyethylene glycol obtained in the previous step, and continue to react for 4 hours. After the reaction is completed, it is cooled to room temperature, the pH value of the solution is adjusted to neutrality with dilute hydrochloric acid, and unreacted impurities are removed by continuous extraction with butanone, and the product is dried to obtain the product lignin-grafted polyethylene glycol.

[0035] 3) Disper...

Embodiment 2

[0038] 1) After 20 grams of polyethylene glycol was weighed and melted completely at 70°C, 0.2 grams of catalyst boron trifluoride ether was added, and then 3.255 milliliters of epichlorohydrin was added dropwise at a speed of 1 mL / min, and the reaction was carried out for 6 hours. After completion of the reaction, excess epichlorohydrin was removed by distillation to obtain epoxy-modified polyethylene glycol.

[0039] 2) Disperse the lignosulfonate in 0.2M sodium hydroxide solution to prepare a dispersion liquid with a mass fraction of 40%, mix with the epoxy-modified polyethylene glycol obtained in the previous step, and continue to react for 6 hours. After the reaction is completed, it is cooled to room temperature, the pH value of the solution is adjusted to neutrality with dilute hydrochloric acid, and unreacted impurities are removed by continuous extraction with butanone, and the product is dried to obtain the product lignin-grafted polyethylene glycol.

[0040] 3) Disp...

Embodiment 3

[0043]1) After 15 grams of polyethylene glycol was weighed and melted completely at 55°C, 0.1 gram of catalyst boron trifluoride ether was added, and then 3 ml of epichlorohydrin was added dropwise at a speed of 0.8 mL / min, and the reaction was carried out for 5 hours. After completion of the reaction, excess epichlorohydrin was removed by distillation to obtain epoxy-modified polyethylene glycol.

[0044] 2) Disperse the lignosulfonate in 0.12M sodium hydroxide solution to prepare a dispersion liquid with a mass fraction of 20%, mix with the epoxy-modified polyethylene glycol obtained in the previous step, and continue to react for 5 hours. After the reaction is completed, it is cooled to room temperature, the pH value of the solution is adjusted to neutrality with dilute hydrochloric acid, and unreacted impurities are removed by continuous extraction with butanone, and the product is dried to obtain the product lignin-grafted polyethylene glycol.

[0045] 3) Disperse 4 g of ...

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Abstract

The invention discloses a preparation method of supramolecular hydrogel capable of being stretched in an ultra-long mode, can be used for strain sensing, and belongs to the technical field of functional polymer materials. The hydrogel is prepared by utilizing the supramolecular action between alpha-cyclodextrin and polyethylene glycol and the dynamic oxidation-reduction effect between lignin and silver ions. The catechol group on the lignin structure reduces silver ions into silver nanoparticles, and the silver nanoparticles are oxidized into quinone / semi-quinone. Meanwhile, the electron resonance effect of the silver nanoparticles reversibly reduces quinone / semi-quinone into a catechol structure. Due to the dynamic oxidation-reduction effect, catechol groups, silver ions and silver nanoparticles stably exist in a system, and the hydrogel is endowed with excellent adhesion performance and conductivity. In addition, the supramolecular action between the alpha-cyclodextrin and the polyethylene glycol provides an effective energy dissipation mechanism for the hydrogel, and endows the hydrogel with extraordinary toughness. The hydrogel prepared by the method has excellent tensile property and conductivity, can be self-healed after being damaged, can be used in the field of strain sensing, and has relatively high sensitivity.

Description

technical field [0001] The invention relates to the field of functional polymer materials, in particular to a method for preparing an ultra-long stretchable supramolecular hydrogel. Background technique [0002] Hydrogel is a polymer network with soft and wet properties, which has a wide range of applications in biomedicine, industry and agriculture. However, conventional hydrogels usually have low strength, lack of toughness, and poor tensile properties, which seriously hinder their further applications. At present, many strategies have been proposed to improve the above-mentioned defects of hydrogels, such as double-network hydrogels, nanocomposite hydrogels, and topological slip-ring structure hydrogels. The essence of these strategies is the reorganization of chemical and physical cross-links within the hydrogel. [0003] When subjected to deformation, brittle and rigid networks dissipate energy efficiently, while soft and malleable networks maintain mechanical integri...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08F285/00C08F220/06
CPCC08J3/075C08F285/00C08J2351/00C08F220/06
Inventor 邵伟江蕾刘佳何姝张杰
Owner NANJING FORESTRY UNIV
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