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Preparation method of alginate/polyacrylamide composite hydrogel with wrinkled surface

A composite hydrogel and polyacrylamide technology, which is applied in diagnostic recording/measurement, instrumentation, diagnosis, etc., can solve the problems of not suitable for large-scale preparation, complex 3D printing equipment, high preparation cost, etc., and achieve the goal of increasing the area Effect of changing, improving mechanical strength and modulus, and high sensitivity

Active Publication Date: 2021-11-09
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In CN 108276522A, the disadvantages of 3D-printable iron ion double-crosslinked alginate-polyacrylamide acrylic acid high-performance hydrogel are as follows: 1. 3D printing needs to have certain fluidity at first, which will make the structure of 3D printing long-term The shape changes during the polymerization process of time; 2.3D printing equipment is complex, the preparation cost is high, the printing time is long and it is not suitable for large-scale preparation

Method used

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  • Preparation method of alginate/polyacrylamide composite hydrogel with wrinkled surface
  • Preparation method of alginate/polyacrylamide composite hydrogel with wrinkled surface
  • Preparation method of alginate/polyacrylamide composite hydrogel with wrinkled surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Dissolve 0.75g of alginate, 6g of acrylamide, 4mg of N,N-methylenebisacrylamide and 0.078g of calcium sulfate dihydrate in 35ml of water, stir and remove air bubbles, and then add 50mg / mL of persulfuric acid 5 ml of ammonium aqueous solution was stirred and mixed, and nitrogen gas was passed through to remove dissolved oxygen. Then, the mixture was injection molded and sealed, and placed in an oven at 70°C for reaction. Finally, the prepared hydrogel was removed from the mold.

[0036] (2) Take the hydrogel prepared in (1) and cut it into a cuboid of 20*5*2mm, and carry out different degrees of pre-stretching on it, and the amount of pre-stretching is 50%, 100%, 200% and 300% respectively ;

[0037] (3) The hydrogels with different pre-stretching were soaked in 2.7mg / mL ferric chloride hexahydrate aqueous solution for 0.5min, 3min, 30min and 180min. Release the pulling force after soaking, and finally wash off excess ions with deionized water.

[0038] (4) A die...

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Abstract

The invention relates to a preparation method of a surface wrinkled alginate / polyacrylamide composite hydrogel. The preparation comprises: pre-stretching the alginate / polyacrylamide hydrogel cross-linked by calcium ions, Soak in an aqueous solution of iron, take out the hydrogel, and wash it. The wrinkled structure on the surface of the composite hydrogel of the present invention can undergo a huge area change when subjected to pressure, so it exhibits high sensitivity under relatively small pressure.

Description

technical field [0001] The invention belongs to the field of preparation of composite hydrogel materials, in particular to a preparation method of alginate / polyacrylamide composite hydrogel with wrinkled surfaces. Background technique [0002] A hydrogel is a gel that uses water as a dispersion medium. Because of good biocompatibility, flexibility, scalability and transparency, it is widely used in biomedical materials, electronic sensing and other fields. [0003] Nowadays, mobile medicine and robots are constantly integrated into our lives. In order to further develop them, it is very important to improve flexible sensor technology. As an ideal flexible sensor material, hydrogel has been studied by a large number of scientific researchers. As one of the sensors, capacitive sensing has attracted attention because of its high sensitivity and stability. The key to improving the sensitivity of capacitive sensing is to increase the area change during the stress process, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08L5/04C08L33/26C08F220/56C08F222/38G01L1/14A61B5/11
CPCA61B5/1118A61B5/1121C08F220/56C08J3/075C08J3/246C08J2333/26C08J2405/04G01L1/142C08F222/385
Inventor 张超王煜烽刘天西李朝阳刘颖
Owner DONGHUA UNIV
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