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 thawi

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

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

Example Embodiment

[0035] Example 2-5

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

Example Embodiment

[0037] Example 6-8

[0038] In order to further enhance the mechanical strength of the prepared porous BNNFs / PVA composite hydrogel. Frozen the prepared hydrogels (with 0.125, 0.175, 0.225g of BNNFs) at -25°C for 1h, and then thaw them naturally to room temperature at room temperature (25°C) to obtain a more flexible and mechanically strong one Hydrogel: After a short period of freeze-thaw treatment, the number of reversible hydrogen bonds in the hydrogel is reduced, which leads to a decrease in the 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. , Which means that while improving the mechanical properties of the hydrogel, it will reduce its self-healing properties.

[0039] Attached figure 1 The XRD pattern in, shows that the diffraction peak of 10wt% (PVA / deionized water) PVA aqueous solution at room temperature without BN is flat, indicating...

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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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