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A kind of green reprocessing method of polymer hydrogel

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

Active Publication Date: 2022-08-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 environmentally unfriendly

Method used

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  • A kind of green reprocessing method of polymer hydrogel
  • A kind of green reprocessing method of polymer hydrogel
  • A kind of green reprocessing method of polymer hydrogel

Examples

Experimental program
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preparation example Construction

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

[0047] 2) Glucose, mannose and sucrose were added to the above-mentioned borax cross-linked PVA hydrogel respectively, and when the final concentration of the added glucose, mannose and sucrose increased to 1.2M, such 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 boron ester bonds at high concentrations. Therefore, the preferred substrate sugar of the present invention is sucrose.

[0048] The effect of sugar concentration on hydrogel reprocessing was tested experimentally. By controlling the sugar concentration, the amount of carbon dioxide produced was regulated, thereby controlling the time from gel to sol and subsequent release of carbon dioxi...

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 an 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 to initiate the instantaneous liquefaction of the polymer hydrogel, the gel becomes a sol, and then 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 borax-crosslinked PVA hydrogel containing yeast: PVA, yeast, borax and pH indicator xylenol orange were mixed in an 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 to initiate the instantaneous liquefaction of the polymer hydrogel, and the gel becomes a sol. Under stirring conditions, AM, HHM, and MBA were added to the transient sol, and the final concentrations of AM were 50 mg / mL and 100 mg / mL, respectively. , 200mg / mL, the mass ratio of AM...

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Abstract

The invention relates to a method for green reprocessing of polymer hydrogel. The invention is based on chemical fuel driving the transformation of polymer material from gel to sol and then to gel, so as to realize the reprocessing of the gel, and adding functional materials in the process of reprocessing can endow the gel with more functional effects . The switching between the two states of sol and gel in the present invention enables the refunctionalization of polymer hydrogels, resulting in multifunctional polymer materials that can be used in flexible electronics, low temperature-resistant strain sensors, magnetic actuators, and field of soft robotics. The reprocessing method of the present invention is to reengineer covalently adaptive and supramolecular polymer networks 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 crucial for the production of functional materials from waste, which represents a sustainable way of material production. Strengthening the polymer network through covalent crosslinking can improve the mechanical properties and solvent resistance of the material, but at the same time greatly reduce the recyclability of the material. Covalently tunable polymer networks offer an excellent strategy to balance crosslinking strength and reworkability of polymeric materials. However, current methods for engineering covalently-adapted polymer networks often require mechanical milling, heating, high pressure, acid and base treatments, or the use of toxic organic solvents. This complex method is energy-intensive and bad for the environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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