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High-strength double-network hydrogel with magnetic responsiveness and preparation method thereof

A magnetically responsive and hydrogel technology, applied in the field of functional materials, can solve the problems of cumbersome preparation process, poor mechanical properties and biocompatibility, poor mechanical properties, etc. The effect of mechanical properties

Inactive Publication Date: 2019-04-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the shortcomings of magnetically responsive hydrogels, such as cumbersome preparation steps, uncontrollable process, poor mechanical properties, and poor biocompatibility of devices, we creatively proposed the use of magnetic Fe 3 o 4 Combining nanoparticles and high-strength double-network hydrogels to prepare magnetically responsive, high-strength double-network hydrogels as magnetically induced actuators
[0006] The purpose of the present invention is to overcome the shortcomings of existing hydrogels such as poor mechanical properties and biocompatibility, cumbersome preparation process, and poor fatigue resistance, and provide a high-strength hydrogel with simple preparation process, high mechanical properties, and good biocompatibility. gel

Method used

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  • High-strength double-network hydrogel with magnetic responsiveness and preparation method thereof
  • High-strength double-network hydrogel with magnetic responsiveness and preparation method thereof
  • High-strength double-network hydrogel with magnetic responsiveness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Fe 3 o 4 Preparation of nanoparticle high-strength magnetically responsive double network hydrogel

[0035] (1) Weigh 5g of prepared Fe 3 o 4 Nanoparticles were added to 200ml deionized water, ultrasonically dispersed to obtain a magnetic fluid, and 0.05mol pectin and 0.25mol acrylamide were added, followed by 1mol% (1% of AM molar concentration) photoinitiator 2-hydroxyl-4-(2 -Hydroxyethoxy)-2-methylpropiophenone (Irgacure 2959) and 0.03mol% (3% of AM molar concentration) cross-linking agent N,N-methylenebisacrylamide (MBA) were added to it, and the The temperature was raised to 70° C., and a homogeneous solution was obtained after stirring for 2 h.

[0036] (2) The resulting solution was vacuumized twice and filled with N 2 remove O from the solution 2 . The solution was then transferred into cuboid molds. The mold was irradiated under an ultraviolet lamp with an intensity of 8W and a wavelength of 365nm for 2h to form a pectin / PAAm single network (...

Embodiment 2

[0040] Example 2: Fe 3 o 4 Preparation of nanoparticle high-strength magnetically responsive double network hydrogel

[0041] (1) Weigh 0.5g Fe 3 o 4 Add nanoparticles to 20ml deionized water, ultrasonically disperse to obtain magnetic fluid, add 0.005mol pectin and 0.005mol acrylamide, then add 0.05mol% of the photoinitiator 2-hydroxyl-4-(2-hydroxyethyl Oxygen)-2-methylpropiophenone (Irgacure 2959) and 0.01mol% (3% of AM molar concentration) cross-linking agent N,N-methylenebisacrylamide (MBA) were added to it, and the temperature was raised to After stirring for 1 h at 50°C, a homogeneous solution was obtained.

[0042] (2) The resulting solution was vacuumized twice and filled with N 2 remove O from the solution 2 . The solution was then transferred into cuboid molds. The mold was irradiated for 1 h under a UV lamp with an intensity of 5 W and a wavelength of 365 nm to form a pectin / PAAm single network (SN) hydrogel.

[0043] (3) Soak the pectin / PAAm single network...

Embodiment 3

[0044] Example 3: Fe 3 o 4 Preparation of nanoparticle high-strength magnetically responsive double network hydrogel

[0045] (1) Weigh the Fe prepared by 50g 3 o 4 Nanoparticles are added to 2000ml deionized water, ultrasonically dispersed to obtain a magnetic fluid, add 0.5mol pectin and 5.5mol acrylamide, then add 2mol% (1% of AM molar concentration) photoinitiator 2-hydroxyl-4-(2 -Hydroxyethoxy)-2-methylpropiophenone (Irgacure 2959) and 0.1mol% (3% of AM molar concentration) cross-linking agent N,N-methylenebisacrylamide (MBA) were added to it, and the The temperature was raised to 80° C., and a homogeneous solution was obtained after stirring for 2 h.

[0046] (2) The resulting solution was vacuumized twice and filled with N 2 remove O from the solution 2 . The solution was then transferred into cuboid molds. The mold was irradiated for 5 hours under an ultraviolet lamp with an intensity of 10W and a wavelength of 365nm to form a pectin / PAAm single network magneti...

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Abstract

The invention discloses high-strength magnetic responsiveness double-network hydrogel based on Fe3O4 nanoparticles and a preparation method thereof. The hydrogel is formed by introducing Fe3O4 nanoparticles into double-network (DN) hydrogel, and the hydrogel utilizes carboxyl groups on molecular chains of natural anionic polysaccharide pectin and trivalent iron ions to form coordination complexesto construct a first network, and a covalently crosslinked polyacrylamide network is taken as a second network. The hydrogel can achieve a tensile strength of 1.20+ / -0.07 MPa, a tensile strain of 1600+ / -232 percent, and an elastic modulus of 1.10 MPa+ / -0.08 MPa by adjusting the content of Fe3O4. More importantly, the hydrogel not only has good mechanical properties, but also has good magnetic responsiveness, can achieve different degrees of bending under an external magnetic field, and can be applied to the field of soft brakes.

Description

technical field [0001] The invention relates to a Fe-based 3 o 4 The invention relates to a preparation method of magnetic responsiveness of nanoparticles and high-strength double-network hydrogel, which belongs to the field of functional materials. Background technique [0002] Magnetically responsive brakes have the characteristics of accurate controllability, fast response speed, and high stability, and are widely used in electronic equipment, medical equipment, biomedicine and other fields. Due to its unique 3D network structure, good flexibility and biocompatibility, high water content and other properties, hydrogel can be effectively used in the field of magnetically responsive brakes, thereby preparing magnetically responsive hydrogel brakes. For magnetically responsive hydrogels, mechanical properties, sensitivity, and fatigue resistance are important performance parameters. However, the mechanical properties of current magnetically responsive hydrogels are weak, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/26C08L5/06C08K3/22C08K3/16C08J3/075
CPCC08J3/075C08J2305/06C08J2333/26C08J2405/06C08J2433/26C08K3/16C08K2003/2275C08K2201/01C08K2201/011
Inventor 姚芳莲于庆雨牛锐李俊杰于超杰
Owner TIANJIN UNIV
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