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Preparation and application methods of porous boron nitride nanofiber/polyvinyl alcohol composite hydrogel

A composite hydrogel and nanofiber technology, applied in nitrogen compounds, chemical instruments and methods, nanotechnology, etc., can solve problems such as field limitations, complex methods, and hydrogels do not have self-healing properties, and achieve enhanced mechanical properties. , the preparation process is simple and the cost is low

Active Publication Date: 2020-11-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method for preparing hydroxyl-functionalized BN nanosheets is relatively complicated, and the hydrogel prepared by the method of freezing and thawing does not have self-healing properties, and the applicable fields are greatly limited (Jing L, Li H, Tay R Y, Sun B, Tsang S H. ACS Nano, 2017, 4, 3742-3751)

Method used

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  • Preparation and application methods of porous boron nitride nanofiber/polyvinyl alcohol composite hydrogel
  • Preparation and application methods of porous boron nitride nanofiber/polyvinyl alcohol composite hydrogel
  • Preparation and application methods of porous boron nitride nanofiber/polyvinyl alcohol composite hydrogel

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Experimental program
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Effect test

Embodiment 1

[0034] Select melamine and boric acid as raw materials, dissolve them in 1000 ml of deionized water, the concentration of which is 0.0126 g of melamine and 0.018 g of boric acid per ml of water, heat them at 90°C to fully dissolve them and keep them at 80°C for 6 hours, take them out and cool them naturally to room temperature, pump Filter the white solid; redissolve the white solid in deionized water at a concentration of 0.008 g of white solid per milliliter of water, keep it warm at 90°C for 3 hours, then quickly freeze the hot solution with liquid nitrogen to make the solution completely turn into a white solid, and Dry in a vacuum freeze dryer (temperature -50°C, 20Pa) for 72 hours to obtain white flocs; finally, heat treatment in a tube furnace at 1050°C for 4 hours under a nitrogen atmosphere with a heating rate of 5°C / min and a gas flow rate of 100mL / min to obtain porous BNNFs.

Embodiment 2-5

[0036] Weigh the prepared porous BNNFs 0.125, 0.175, 0.225, 0.275g, respectively dispersed in 100mL deionized water, magnetically stirred for 180min, and then 10g white flocculent PVA (molecular weight: 77000). Add to the above dispersion liquid respectively, heat and stir in a water bath for 2 hours, then turn off the stirring and keep warm for 1 hour (both heating and heat preservation temperatures are 95°C), then pour the prepared high-temperature sol into a mold and cool to room temperature, Hydrogels with high self-healing efficiency were obtained.

Embodiment 6-8

[0038] In order to further enhance the mechanical strength of the prepared porous BNNFs / PVA composite hydrogel. The prepared hydrogels (0.125, 0.175, 0.225 g of BNNFs added) were frozen at -25 °C for 1 h, and then naturally thawed to room temperature at room temperature (25 °C), resulting in better flexibility and higher mechanical strength. Hydrogel: After a short period of freeze-thaw treatment, the number of reversible hydrogen bonds in the hydrogel decreases, resulting in a decrease in self-healing efficiency, and the crystallinity of the PVA molecular chain increases, resulting in an increase in mechanical strength. It is found that the two are inversely proportional to each other. , indicating that the self-healing properties of hydrogels will be reduced while improving the mechanical properties of the hydrogel.

[0039] attached figure 1 The XRD collection of patterns in shows that without adding BN, the diffraction peaks of 10wt% (PVA / deionized water) PVA aqueous solu...

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Abstract

The invention relates to a preparation method and an application method of porous boron nitride nanofiber / polyvinyl alcohol composite hydrogel. The preparation method comprises the following steps: adding porous BNNFs into deionized water to obtain a dispersion liquid; and adding PVA into the dispersion liquid, conducting heating and stirring in a water bath at 90-100 DEG C for 2-4 hours, and naturally cooling the sol obtained after heat preservation to room temperature, thereby obtaining the porous boron nitride nanofiber / polyvinyl alcohol composite hydrogel with favorable self-healing property. The hydrogel obtained by the invention can be retreated by a short-time freeze thawing method, so the mechanical properties of the hydrogel are enhanced, and the hydrogel can be used in the fieldsof biomedicine, wearable flexible electronic devices and the like, and has higher safety usability compared with hydrogel prepared by polymerizing monomolecules via a chemical cross-linking agent.

Description

technical field [0001] The technical solution of the present invention relates to the preparation and performance regulation of a composite hydrogel, specifically a method for preparing a porous boron nitride nanofiber / polyvinyl alcohol (BNNFs / PVA) composite hydrogel and enhancing its mechanical properties , can be safely used in biomedicine, cosmetics, wearable and flexible electronic devices and other fields. Background technique [0002] Porous boron nitride (BN) nanofibers are a class of boron nitride nanofibers (BNNFs) materials with a network structure of interpenetrating or closed pores, which not only have the characteristics of porous materials, such as high specific surface area and abundant pore structure, And it also has many attractive properties of hexagonal BN materials, including high thermal conductivity, chemical inertness and high oxidation resistance, in addition, a large number of hydroxyl functional groups were introduced during the preparation process ...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L29/04C08K7/24C01B21/064B82Y30/00B82Y40/00
CPCC08J3/075C01B21/064B82Y30/00B82Y40/00C08J2329/04C08K7/24C08K2201/011C01P2004/16C01P2004/64C01P2004/61C01P2002/72C01P2004/03
Inventor 黄阳高向前林靖郁超唐成春
Owner HEBEI UNIV OF TECH
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