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Method for preparing stimuli-responsive porous aquagel

A porous hydrogel and stimuli-responsive technology, which is applied in the field of preparation of stimuli-responsive porous hydrogels, can solve the problems of slow thermal response speed and long time consumption, and achieves improved elasticity and fatigue resistance, improved response speed and Swelling ratio, effect of reducing manufacturing cost

Active Publication Date: 2020-01-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a preparation method of stimuli-responsive porous hydrogel, which aims to solve the problems of long time-consuming and slow thermal response speed of the existing hydrogel freezing preparation method

Method used

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  • Method for preparing stimuli-responsive porous aquagel
  • Method for preparing stimuli-responsive porous aquagel
  • Method for preparing stimuli-responsive porous aquagel

Examples

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preparation example Construction

[0025] Such as figure 1 Shown, the present invention provides a kind of preparation method of stimuli-responsive porous hydrogel, comprising the following steps:

[0026] Step 1. Mix polymer monomer, initiator, crosslinking agent and water according to the mass ratio of (500~2000):(2~5):(1~10):5000 at 0~4°C to obtain Precursor;

[0027] In some typical examples, N-isopropylacrylamide, N,N-methylenebisacrylamide and ammonium persulfate are dissolved in 5 mL of deionized aqueous solution at a mass ratio of 500:1:10, and placed in an ice-water bath Use a magnetic stirrer to stir for 2 hours to obtain a homogeneous aqueous solution, then place the mixture under nitrogen protection, rinse for 30 minutes, remove dissolved oxygen, and finally add 10 μL of tetramethylethylenediamine under vigorous stirring, and store in a nitrogen-protected ice Stir in a water bath for 10 min to obtain a precursor mixed solution.

[0028] Step 2. Place the obtained precursor liquid at -10 to -40°C ...

Embodiment 1

[0035] Dissolve 0.5 g of N-isopropylacrylamide, 1 mg of N,N-methylenebisacrylamide, and 10 mg of ammonium persulfate in 5 mL of deionized water, and stir for 2 hours in an ice-water bath using a magnetic stirrer to obtain a homogeneous aqueous solution , and then the mixture was placed under nitrogen protection, rinsed for 30 min to remove dissolved oxygen, and finally 10 μL of tetramethylethylenediamine was added under vigorous stirring, and stirred in an ice-water bath under nitrogen protection for 10 min to obtain a precursor mixed solution. The obtained mixed solution was quickly placed in a centrifuge tube, and placed in a refrigerator at -20°C for freezing and polymerization for 2 hours to obtain a cryogel. The cryogel was thawed and polymerized in a refrigerator at 4° C. for 2 hours to obtain the high-performance hydrogel. The swelling ratio of the hydrogel is 41, the deswelling rate is 20s, the swelling rate is 30s, and the compressive strain is 80%.

Embodiment 2

[0037]Dissolve 0.5 g of N-isopropylacrylamide, 1 mg of N,N-methylenebisacrylamide, and 10 mg of ammonium persulfate in 5 mL of deionized water, and stir for 2 hours in an ice-water bath using a magnetic stirrer to obtain a homogeneous aqueous solution , and then the mixture was placed under nitrogen protection, rinsed for 30 min to remove dissolved oxygen, and finally 10 μL of tetramethylethylenediamine was added under vigorous stirring, and stirred in an ice-water bath under nitrogen protection for 10 min to obtain a precursor mixed solution. The obtained mixed solution was quickly placed in a centrifuge tube, and placed in a refrigerator at -20°C for freezing polymerization for 9 hours to obtain a cryogel. The cryogel was thawed and polymerized in a refrigerator at 4° C. for 9 hours to obtain the high-performance hydrogel. The swelling ratio of the hydrogel is 37.6, the deswelling rate is 20s, the swelling rate is 30s, and the compressive strain is 80%.

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Abstract

The invention discloses a method for preparing stimuli-responsive porous aquagel. The method comprises the steps: uniformly mixing polymer monomers, an initiator, a cross-linker and water according toa preset mass ratio at the temperature of 0 DEG C to 4 DEG C, so as to obtain a precursor; subjecting the obtained precursor to freezing polymerization for 1 to 24 hours at the temperature of -40 DEGC to -10 DEG C, so as to obtain frozen gel; and subjecting the frozen gel to unfreezing polymerization for 1 to 24 hours at the temperature of 4 DEG C to 20 DEG C, thereby obtaining the stimuli-responsive porous aquagel. According to the method provided by the invention, freezing polymerization prior to unfreezing polymerization is employed, and the freezing condition is -40 DEG C to -10 DEG C, so that the rapid formation of ice crystals is facilitated, thus, the polymerization time is greatly shortened, and the production cost is reduced. Meanwhile, the obtained frozen gel is subjected to unfreezing polymerization for 1 to 24 hours at the temperature of 4 DEG C to 20 DEG C and is subjected to rapid cross-linking polymerization while the ice crystals melt, and thus, the elasticity and fatigue resistance of the aquagel are improved; and due to a porous effect after ice crystal melting, the thermal response characteristic and swelling ratio of the aquagel are improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrogel materials, and more specifically relates to a method for preparing a stimulus-responsive porous hydrogel. Background technique [0002] Stimuli-responsive hydrogels can change their state by receiving external environmental stimuli. External stimuli such as pH value, light intensity, temperature, humidity, ionic strength, electric field and magnetic field, etc., will cause changes in the molecular structure of the hydrogel itself, and change the bulk phase or other physical and chemical properties of the macromolecular system, resulting in corresponding changes. the response to. Due to their unique stimuli-responsive properties, hydrogels have shown great potential in many aspects, including smart sensors, smart optical switches, drug delivery, artificial muscles, tissue engineering scaffolds, and soft robots. Gels have attracted the attention of researchers. Among them, poly(N-...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F222/38C08J9/28C08L33/24
CPCC08F220/54C08J9/28C08J2333/24C08F222/385
Inventor 熊伟刘敬伟邓磊敏段军
Owner HUAZHONG UNIV OF SCI & TECH
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