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A kind of antifreeze high-strength supramolecular organic hydrogel and preparation method thereof

A hydrogel, high-strength technology, applied in the field of functional materials, can solve the problems of insufficient mechanical properties of antifreeze organic hydrogels, cumbersome preparation process, complex composition of raw materials, etc., to achieve good antifreeze characteristics, single gel composition, Source-rich effects

Active Publication Date: 2021-08-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of existing antifreeze organic hydrogels such as insufficient mechanical properties, cumbersome preparation process, complex raw material composition and insufficient functionality, and provide a simple preparation process, single raw material composition, and simultaneously have antifreeze properties and high Mechanically strong supramolecular organohydrogels and methods for their preparation

Method used

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  • A kind of antifreeze high-strength supramolecular organic hydrogel and preparation method thereof
  • A kind of antifreeze high-strength supramolecular organic hydrogel and preparation method thereof
  • A kind of antifreeze high-strength supramolecular organic hydrogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] Example 1: Preparation of high-strength supramolecular gelatin organohydrogel with antifreeze properties

[0031] (1) Prepare an aqueous gelatin solution with a concentration of 0.1 g / ml, heat to 60° C., and stir for 35 minutes to obtain a transparent aqueous gelatin solution.

[0032] (2) Transfer the obtained gelatin solution into a cuboid mold, and then place it at 4° C. for 30 min to obtain a gelatin pre-hydrogel.

[0033] (3) prepare water / glycerol mixed solution, wherein the massfraction that glycerin accounts for mixed solution is 50wt%; Take a certain amount of sodium citrate (Na 3 Cit), it is dissolved therein, makes its mass fraction be 20wt%, forms Na 3 Cit's water / glycerol solution, set aside.

[0034] (4) Soak the gelatin pre-hydrogel in the Na obtained in step (3) 3 In the water / glycerol solution of Cit, soak for 3 hours, so that the water molecules in the gelatin pregel are partially replaced by glycerol, and the gelatin molecular chains generate hydro...

Embodiment 2

[0038] (1) Prepare an aqueous gelatin solution with a concentration of 0.02 g / ml, heat to 50° C., and stir for 10 minutes to obtain a transparent aqueous gelatin solution.

[0039] (2) Transfer the obtained gelatin solution into a cuboid mold, and then place it at 4° C. for 50 min to obtain a gelatin pre-hydrogel.

[0040] (3) prepare water / glycerol mixed solution, wherein the massfraction that glycerin accounts for mixed solution is 1wt%; Take a certain amount of sodium citrate (Na 3 Cit), it is dissolved therein, makes its mass fraction be 1wt%, forms Na 3 Cit's water / glycerol solution, set aside.

[0041] (4) Soak the gained gelatin pre-hydrogel in the Na obtained in step (3) 3In the water / glycerol solution of Cit, soak for 15 minutes, finally obtain supramolecular gelatin organohydrogel.

Embodiment 3

[0043] (1) Prepare an aqueous gelatin solution with a concentration of 0.02 g / ml, heat to 50° C., and stir for 10 minutes to obtain a transparent aqueous gelatin solution.

[0044] (2) Transfer the obtained gelatin solution into a cuboid mold, and then place it at 4° C. for 50 min to obtain a gelatin pre-hydrogel.

[0045] (3) prepare water / glycerin mixed solution, wherein the massfraction that glycerin accounts for mixed solution is 99wt%; Take a certain amount of sodium citrate (Na 3 Cit), it is dissolved therein, makes its mass fraction be 40wt%, forms Na 3 Cit's water / glycerol solution, set aside.

[0046] (4) Soak the gained gelatin pre-hydrogel in the Na obtained in step (3) 3 In the water / glycerin solution of Cit, immerse for 12 hours, finally obtain supramolecular gelatin organohydrogel.

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Abstract

The invention relates to an antifreeze high-strength supramolecular organic hydrogel and a preparation method thereof; a combination of a binary solvent water-glycerin system with antifreeze properties and a high-strength supramolecular hydrogel; gelatin prehydrogel Soak the water-glycerol mixed solution of sodium citrate, the water molecules in the gelatin pregel are partially replaced by glycerin to form an organic hydrogel, and the gelatin molecular chains generate hydrophobic associations, Cit 3‑ with NH on the gelatin chain 3 + Supramolecular interactions such as ionic coordination are generated, the mechanical properties of the gel are enhanced, and a freeze-resistant high-strength supramolecular organic hydrogel is obtained. The organic hydrogel does not freeze at ‑196°C and can maintain good flexibility at ‑80°C. The tensile strength is 0.10MPa‑5.0MPa, the breaking strain is 200%‑1000%, and the elastic modulus is 10.0KPa‑200.0KPa , toughness at 0.10MJ m ‑3 ‑10.20MJ m ‑3 .

Description

technical field [0001] The invention relates to a gelatin-based antifreeze and high-strength supramolecular organic hydrogel and a preparation method thereof, belonging to the field of functional materials. Background technique [0002] As a "soft-wet" material with a 3D network structure and high water content, hydrogel has great potential in biomedical fields, soft actuators, health detection devices, and electronic skin due to its tunable physicochemical properties and biomimetic properties. Wide range of applications. To meet these applications, hydrogels should not only have appropriate mechanical properties, but also be able to maintain performance stability in complex environments. However, the poor mechanical properties of most conventional hydrogels, and the loss of their properties due to the freezing of water in the gel network at subzero temperatures severely limit the application of hydrogels. Therefore, designing a high-strength hydrogel with antifreeze prope...

Claims

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Application Information

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IPC IPC(8): C08J7/14C08J3/075C08J3/24C08L89/00
Inventor 李俊杰秦志辉姚芳莲董殿宇
Owner TIANJIN UNIV
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