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Preparation method of hyperelastic nanocomposite hydrogel resistant to high temperature, low temperature and organic solvents

An organic solvent and nanocomposite technology, applied in the field of nanomaterials, can solve problems such as being easily affected by the external environment, singleness, and limited applications, and achieve excellent thermal stability.

Active Publication Date: 2021-05-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, most current nanocomposite hydrogels suffer from poor mechanical properties due to the single structure, lack of effective energy dissipation mechanism or agglomeration induced by the high surface energy of nanoparticles, which limits its Applications in related fields
However, due to the high water content and hydrophilic polymer network of most nanocomposite hydrogels, it is more susceptible to the influence of the external environment, such as the gel freezes below 0 °C, and the solvent is evaporated at higher temperatures. Molecular chain shrinkage in complex liquid environment, etc.

Method used

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  • Preparation method of hyperelastic nanocomposite hydrogel resistant to high temperature, low temperature and organic solvents
  • Preparation method of hyperelastic nanocomposite hydrogel resistant to high temperature, low temperature and organic solvents
  • Preparation method of hyperelastic nanocomposite hydrogel resistant to high temperature, low temperature and organic solvents

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]1. Synthetic average dispersion emulsion of about 700 nm of particle diameter. In first, 45 ml of deionized water is taken in 100 ml of transparent glass bottles, and the magnetic stirrer 300 rpm is stirred and set the temperature of 40 ° C; then slowly add 5 ml of hydroxy-block polyimethylsiloxane by pipette, and to be added After 30 minutes, 50-150 mg of sodium dodecyl sulfate was added, and stirred for 12 hours to obtain a homogeneous emulsion.

[0027]2. Add 0.1 m silver ammonia solution 800 μl to 30 minutes to the homogeneous emulsion obtained in step 1, and the mixture is warmed to 60 ° C for 2 hours to obtain a silver nanoparticle coated hydroxyl seal polydimethylsiloxane emulsion. Graphic particles.

[0028]3, add N, N'-bis (propyl) cystamine crosslinking agent to the emulsion hybrid particles obtained, stirred for 5-10 minutes, that is, the silver sulfur coordination key silver nanoparticle package is constructed. Hydroxy-hydroxyl-based polydimethylsiloxane is a cross-linki...

Embodiment 2

[0031]1. Synthesis a homogeneous dispersion emulsion of around 800 nm. In first, 45 ml of deionized water is taken in 100 ml of transparent glass bottles, and the magnetic stirrer 300 rpm is stirred and set the temperature of 40 ° C; then slowly add 5 ml of hydroxy-block polyimethylsiloxane by pipette, and to be added After 30 minutes, 50-150 mg of sodium dodecyl sulfate was added, and the mixture was given for 10 hours to obtain a homogeneous emulsion.

[0032]2, 0.1 m silver ammonia solution 800 μl was added to 30 minutes to the homogeneous emulsion, and the mixture was continued to 60 ° C for 2 hours to obtain a silver nanoparticle coated hydroxyl seal polydimethylsiloxane emulsion. Graphic particles.

[0033]3, add N, N'-bis (propyl) cystamine crosslinking agent to the emulsion hybrid particles obtained, stirred for 5-10 minutes, that is, the silver sulfur coordination key silver nanoparticle package is constructed. Hydroxy-hydroxyl-based polydimethylsiloxane is a cross-linking center...

Embodiment 3

[0036]1. Synthesis of homogeneous dispersion emulsions with a particle diameter of 900 nm. In first, 45 ml of deionized water is taken in 100 ml of transparent glass bottles, and the magnetic stirrer 300 rpm is stirred and set the temperature of 40 ° C; then slowly add 5 ml of hydroxy-block polyimethylsiloxane by pipette, and to be added After 30 minutes, 50-1500 mg of sodium dodecyl sulfate was added, and stirred for 8 hours, the homogeneous emulsion was obtained.

[0037]2, 0.1 m silver ammonia solution 800 μl was added to 30 minutes to the homogeneous emulsion, and the mixture was continued to 60 ° C for 2 hours to obtain a silver nanoparticle coated hydroxyl seal polydimethylsiloxane emulsion. Graphic particles.

[0038]3, add N, N'-bis (propyl) cystamine crosslinking agent to the emulsion hybrid particles obtained, stirred for 5-10 minutes, that is, the silver sulfur coordination key silver nanoparticle package is constructed. Hydroxy-hydroxyl-based polydimethylsiloxane is a cross-li...

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Abstract

The invention discloses a preparation method of hyperelastic nanocomposite hydrogel resistant to high temperature, low temperature and organic solvents. The preparation method comprises the following steps: firstly, forming homogeneous emulsion microspheres from hydroxyl-terminated polydimethylsiloxane and lauryl sodium sulfate; then adding a silver ammonia solution to form uniform silver nanoparticles in situ on the hydroxyl-terminated polydimethylsiloxane microspheres; and finally, preparing the nanocomposite hydrogel with a three-dimensional network from a polymer and an emulsion hybrid particle large cross-linking agent, which is constructed by a silver-sulfur coordination bond that is formed by modifying silver nano-particles with an N,N'-bis(acryloyl)cystamine cross-linking agent. According to the invention, the large cross-linking agent of a self-assembly structure and a polymer elastic network cooperate with each other, so the nanocomposite hydrogel prepared by the invention has excellent organic solvent resistance and relatively high thermal stability.

Description

Technical field[0001]The present invention relates to a method of preparing a super elastic nanocomposite hydrogel having a high and low-temperature or organic solvent, and is a nanocomposite hydrogel formed by silver nanoparticles covering emulsion microspheres, belonging to the technical field of nanomaterials.Background technique[0002]Hydrogel has been favored by materials and bioscientists due to its biocompatibility with similar physiological properties and heights with human tissue. However, the currently mature acrylamide hydrogel system has poor mechanical properties, especially in terms of stretching flexibility. The inorganic nanoparticles have a higher specific surface area and size effect, which is increasingly caused by a toughening mechanism in the nano-composite hydrogel field. In addition, most nanocomposite hydrogels are due to a single structure, lack of effective energy dissipation mechanisms or agglomerates that can be caused by high surfaces of nanoparticles, li...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J9/00C08F283/12C08F220/56C08K3/08C08L51/08
CPCC08J3/075C08J9/00C08F283/12C08K3/08C08J2351/08C08K2003/0806C08F220/56
Inventor 从怀萍李政秦海利姚元清
Owner HEFEI UNIV OF TECH
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