Green reprocessing method of polymer hydrogel

A polymer hydrogel and hydrogel technology, applied in the polymer field, can solve the problems of unfavorable environment, heating and high energy consumption

Active Publication Date: 2021-04-23
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, current methods for engineering covalently adaptable polymer networks often require mechanical milling, heat, high pressure,

Method used

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  • Green reprocessing method of polymer hydrogel
  • Green reprocessing method of polymer hydrogel
  • Green reprocessing method of polymer hydrogel

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Experimental program
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Effect test

preparation example Construction

[0046] 1) Preparation of borax-crosslinked PVA hydrogel: mix PVA and borax in an aqueous solution, the final concentrations of PVA and borax are 50 mg / mL and 13 mg / mL respectively; the hydrogel is formed in less than 10 minutes;

[0047] 2) Glucose, mannose, and sucrose were added to the above-mentioned borax-crosslinked PVA hydrogel respectively. As the final concentration of added glucose, mannose, and sucrose increased to 1.2M, as figure 1 As shown, glucose and mannose appear as a sol, while sucrose is still in a gel state, indicating that cis-1,2-diol can break boronate bonds at high concentrations. Therefore, the preferred substrate sugar in the present invention is sucrose.

[0048] Experiments test the effect of sugar concentration on hydrogel reprocessing. By controlling the concentration of sugar, the amount of carbon dioxide produced is regulated, thereby controlling the time from gel to sol, and the subsequent release of carbon dioxide, which determines the time fro...

Embodiment 1

[0053] A method for green reprocessing of polymer hydrogel, the steps are as follows:

[0054] (1) Preparation of yeast-containing borax-crosslinked PVA hydrogel: PVA, yeast, borax and pH indicator xylenol orange were mixed in aqueous solution, and the final concentrations of PVA, yeast, borax and xylenol orange were 50 mg respectively / mL, 13mg / mL, 13mg / mL, and 0.18mg / mL; hydrogels formed in less than 10 minutes;

[0055] (2) Add sucrose with a final concentration of 0.1M to the above-mentioned borax-crosslinked PVA hydrogel containing yeast, and use yeast to metabolize sucrose to generate carbonic acid, thereby reducing the pH of the gel system and breaking the dynamic covalent boron ester bond open to trigger the instantaneous liquefaction of the polymer hydrogel, the gel turns into a sol, and then releases carbon dioxide (CO 2 ), the pH of the gel system increases, so that the sol becomes a gel.

Embodiment 2

[0057] A method for green reprocessing of polymer hydrogel, the steps are as follows:

[0058] (1) Preparation of yeast-containing borax-crosslinked PVA hydrogel: PVA, yeast, borax and pH indicator xylenol orange were mixed in aqueous solution, and the final concentrations of PVA, yeast, borax and xylenol orange were 50 mg respectively / mL, 13mg / mL, 13mg / mL, and 0.18mg / mL; hydrogels formed in less than 10 minutes;

[0059] (2) Add sucrose with a final concentration of 0.1M to the above-mentioned borax-crosslinked PVA hydrogel containing yeast, and use yeast to metabolize sucrose to generate carbonic acid, thereby reducing the pH of the gel system and breaking the dynamic covalent boron ester bond open to trigger the transient liquefaction of the polymer hydrogel, the gel becomes a sol, and AM, HHM, and MBA are added to the transient sol under stirring conditions, and the final concentrations of AM are 50 mg / mL and 100 mg / mL, respectively , 200mg / mL, the mass ratio of AM, HHM,...

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Abstract

The invention relates to a green reprocessing method of polymer hydrogel. According to the invention, the polymer material gel is driven by a chemical fuel to be converted into sol and then into gel, so that the gel is reprocessed, and a functional material is added in the reprocessing process, so that the gel is endowed with more functional effects. Switching between the sol state and the gel state enables the polymer hydrogel to be functionalized again, so that multi-functional polymer materials are generated, and the materials can be applied to the fields of flexible electronics, low-temperature-resistant strain sensors, magnetic actuators and soft robots. According to the reprocessing method of the present invention, covalently adaptive and supramolecular polymer networks are reconstructed repeatedly in a green manner.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a method for green reprocessing of polymer hydrogels. Background technique [0002] The redesign and reprocessing of synthetic materials is essential for the production of functional materials from waste, which represents a sustainable way of material production. Strengthening the polymer network through covalent cross-linking can improve the mechanical properties and solvent resistance of the material, but at the same time, the recyclability of the material is greatly reduced. Covalently tunable polymer networks offer an excellent strategy to balance crosslink strength and reprocessability of polymeric materials. However, current methods for engineering covalently adaptable polymer networks often require mechanical milling, heat, high pressure, acid and base treatments, or the use of toxic organic solvents. This complex method is energy-intensive and environmental...

Claims

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Application Information

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IPC IPC(8): C08J7/00C08J3/075C08L29/04C08L5/08
CPCC08J7/00C08J3/075C08J2329/04C08J2305/08Y02W30/62
Inventor 王旭钟渊博
Owner SHANDONG UNIV
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