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Preparation method and application of large strain superelastic PVA(polyvinyl alcohol)/MCNTS (multi-walled carbon nanotube) hydrogel

A hydrogel and superelastic technology, which is applied in the field of preparation of large strain superelastic PVA/MCNTS hydrogel, can solve the problems of poor conductivity and limitations of polyvinyl alcohol hydrogel, and achieve the solution of uneven distribution of carbon tubes, Large strain, high superelastic effect

Inactive Publication Date: 2019-10-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a biocompatible organic polymer, polyvinyl alcohol exhibits large tensile strain and toughness, but the non-recovery during stretching limits its ability as a substrate for strain sensors.
The polyvinyl alcohol hydrogel prepared by freezing cycle has a large number of three-dimensional physical cross-linked network, which makes it have large strain and good elasticity, but the conductivity of polyvinyl alcohol hydrogel is poor

Method used

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  • Preparation method and application of large strain superelastic PVA(polyvinyl alcohol)/MCNTS (multi-walled carbon nanotube) hydrogel
  • Preparation method and application of large strain superelastic PVA(polyvinyl alcohol)/MCNTS (multi-walled carbon nanotube) hydrogel
  • Preparation method and application of large strain superelastic PVA(polyvinyl alcohol)/MCNTS (multi-walled carbon nanotube) hydrogel

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Effect test

preparation example Construction

[0026] Such as figure 1 Shown, a kind of preparation method of large strain hyperelastic PVA / MCNTS hydrogel comprises the following steps:

[0027] 01. Adopt CVD tube furnace, use 100ml dichlorobenzene as carbon source, 0.6g ferrocene as catalyst, in the atmosphere of 2000sccm hydrogen and argon mixed gas, the reaction temperature is 850℃, grow disordered on the wall of quartz tube MCNTS powder;

[0028] 02. Soak the MCNTS powder in 20% dilute nitric acid for 12 hours. After acidification, the MCNTS powder is washed to neutrality by a suction filter and then separated from the solid and liquid. The separated MCNTS is dried in a vacuum oven at 60°C for 12 hours. The dried MCNTS powder is ground into finer particles with a mortar;

[0029] 03. Add 10g of PVA powder into 90ml of water, heat and stir in a water bath at 85°C for 3h to prepare a 10wt.% PVA aqueous solution, add the MCNTS powder treated in step 02 into the PVA aqueous solution, and heat in a water bath at 65°C for ...

Embodiment 1

[0034] Add 10g of PVA powder into 90ml of water, heat and stir in a water bath at 85°C for 3h to obtain PVA in water. MCNTS powder was prepared by chemical vapor deposition. After the MCNTS powder was acidified, dried, and ground, 0.2 g of MCNTS powder was added to 30 ml of the PVA solution, heated and stirred in a water bath at 65 ° C for 3 h, and the PVA / MCNTS mixed solution obtained was poured into the mold. It was frozen in the refrigerator for 12 hours, and then thawed at room temperature for 12 hours. The freezing and thawing process was repeated several times to obtain the PVA / MCNTS hydrogel.

Embodiment 2

[0036] Add 10g of PVA powder into 90ml of water, heat and stir in a water bath at 85°C for 3h to obtain PVA in water. MCNTS powder was prepared by chemical vapor deposition. After the MCNTS powder was acidified, dried, and ground, 0.6g of MCNTS powder was added to 30ml of the PVA solution, heated and stirred in a water bath at 65°C for 3h, and the PVA / MCNTS mixed solution obtained was poured into the mold. It was frozen in the refrigerator for 12 hours, and then thawed at room temperature for 12 hours. The freezing and thawing process was repeated several times to obtain the PVA / MCNTS hydrogel.

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Abstract

The invention provides a preparation method and application of a large strain superelastic PVA / MCNTS(multi-walled carbon nanotube) hydrogel. The preparation method comprises the following steps: 01. preparing disordered MCNTS powder by chemical vapor deposition; 02. acidifying, separating, drying and grinding the MCNTS powder; 03. preparing a PVA aqueous solution, adding the MCNTS powder treated in the step 02 into the PVA aqueous solution, and heating and stirring in a water bath to fully disperse the MCNTS powder to prepare a PVA / MCNTS mixed solution; and 04. pouring the PVA / MCNTS mixed solution in the step 03 into a mold, and then freezing and thawing for many times to obtain the PVA / MCNTS hydrogel. The polyvinyl alcohol / multi-walled carbon nanotube hydrogel prepared by the method has uniform components, has large tensile strain and compressive strain at the same time, and has superelasticity and sensitivity factors in the tensile process and the compression process. Due to excellent performance, the hydrogel can be used as a strain sensor in the field of flexible stretchable devices.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a preparation method and application of a large-strain superelastic PVA / MCNTS hydrogel, which can be used as a strain sensor in the field of flexible and wearable electronic devices. Background technique [0002] With the development of science and technology and artificial intelligence, the demand for flexible and wearable electronic devices is increasing. Currently, most flexible wearable devices use organic polymer flexible substrates and conductive dielectric fillers. Carbon nanotubes are a typical one-dimensional tubular nanomaterial with good electrical and thermal conductivity and good mechanical properties, and are widely used in strain sensors. As an organic polymer with good biocompatibility, polyvinyl alcohol has large tensile strain and toughness, but the non-recovery during stretching limits its ability as a substrate for strain sensors. The polyvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K9/02C08K3/04C08J3/075
CPCC08J3/075C08J2329/04C08K9/02C08K3/041
Inventor 上媛媛常书龙孙玉平侯思羽
Owner ZHENGZHOU UNIV
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