Mxene@chitosan@polyurethane foam three-dimensional composite material, and preparation method and application thereof

A technology of polyurethane foam and composite materials, which is applied in the measurement of the property force of piezoelectric resistance materials and the measurement of fluid pressure by changing the ohmic resistance. It can solve the problems of cumbersome preparation methods, high cost and limitations, and avoid operation The effect of simple process and preparation method and convenient operation

Active Publication Date: 2019-03-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on using polyurethane foam as the sensor skeleton (documents 1, 2, 3) and the research on using Mxene as a conductive filler (documents 4, 5)

Method used

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  • Mxene@chitosan@polyurethane foam three-dimensional composite material, and preparation method and application thereof
  • Mxene@chitosan@polyurethane foam three-dimensional composite material, and preparation method and application thereof
  • Mxene@chitosan@polyurethane foam three-dimensional composite material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The preparation method of Mxene nano sheet is as follows:

[0054] (1) The MAX precursor is sieved with 500 mesh;

[0055] (2) Add 10ml of deionized water into the polytetrafluoroethylene container, and put it in an ice bath, so that the temperature of the deionized water drops below 5°C, slowly add 20ml of HCl under the condition of magnetic stirring, and continue to stir until the temperature drops to 5°C Next, add 1g LiF and stir for 1h;

[0056] (3) Divide the screened MAX precursor into 5 times and add slowly at an interval of 12 minutes each time. After the addition, naturally raise the temperature to room temperature for 30 minutes, and then raise the temperature to 35°C for 25-28 hours;

[0057] (4) Centrifuge the reacted product at 3500rpm for 5min, repeat N times until the pH of the supernatant reaches about 7;

[0058] (5) Collect the final neutral or near-neutral suspension, and ultrasonically strip it for 0-1h under the protection of argon;

[0059] (6) ...

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Abstract

The invention relates to a Mxene@chitosan@polyurethane foam three-dimensional composite material and a high-sensitivity and high-reliability piezoresistive sensor constructed by using the material, and preparation methods thereof. The structure control of a conductive network and micro-cracks in the sensor and introduction of the structure system of Mxene@chitosan make a polyurethane skeleton firmly and closely coated with a conductive filler, so the stability of long-term recycling is greatly improved; and Mxene nanosheets have a small size, and the number of the micro-cracks produced by thepolyurethane-coated skeleton is high, and the detection under small strain is accurate. The Mxene@CS@PU composite three-dimensional structure with good stress strain can be obtained by optimizing theimpregnation frequency (1 to 5, and preferably 2) of a conductive filler in the preparation process of the sensor and the treatment steps of a technology of centrifugal removal of the Mxene nansheetsnot completely coating the skeleton and the drying temperature in the preparation process.

Description

technical field [0001] The invention belongs to the field of flexible and wearable electronics and new material technology, and specifically relates to a novel composite piezoresistive polyurethane foam, a preparation method thereof, and a piezoresistive sensor assembled using the composite polyurethane foam. Background technique [0002] The two-dimensional sheet-like nanomaterial Mxene-transition metal carbide is a new type of conductive material, which was jointly discovered by Professor Yuri Gao Guoqi and his colleagues from Drexel University in the United States in 2011. Mxene is obtained by etching the MAX phase of its precursor material. Among them, M is a transition group metal, A is mainly a group III or IV element, and X is a C or N element. Since Mxene has a two-dimensional sheet structure similar to graphene, and has the characteristics of large specific surface area, many active sites, and atomic layer thickness, it also has the advantages of good hydrophilicit...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08J9/40G01L1/18G01L9/06C08L75/04C08L5/08
CPCC08J9/40C08J9/42C08J2375/04C08J2405/08G01L1/18G01L9/06
Inventor 李晓锋李晓鹏李岳宋德奎胡晨闵芃张好斌于中振
Owner BEIJING UNIV OF CHEM TECH
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