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A kind of conductive aramid nanofiber composite aerogel and preparation method thereof

A composite airgel and nanofiber technology, applied in the direction of electromagnetic measuring devices, electric/magnetic solid deformation measurement, etc., can solve the problem that aramid nanofiber airgel has no conductivity, poor compression resilience, and cannot be used as a pressure sensor And other problems, to achieve cycle stability and long service life, extended service life, excellent temperature resistance effect

Active Publication Date: 2022-07-26
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a conductive aramid nanofiber composite airgel and its preparation method, to overcome the lack of electrical conductivity, poor compression resilience and inability to be applied to pressure sensors, etc. The problem of application in the field, the present invention adopts new process and new method to develop and produce conductive aramid nanofiber composite airgel with low density, high strength, high sensitivity, long cycle stability and service life, and the preparation process is simple and feasible , with broad application prospects

Method used

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  • A kind of conductive aramid nanofiber composite aerogel and preparation method thereof
  • A kind of conductive aramid nanofiber composite aerogel and preparation method thereof
  • A kind of conductive aramid nanofiber composite aerogel and preparation method thereof

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preparation example Construction

[0031] A preparation method of conductive aramid nanofiber composite aerogel, comprising the following steps:

[0032] Step 1: Prepare aramid nanofiber dispersion, mix 1 g of aramid chopped fibers with a length of 6 mm, 1.5 g of potassium hydroxide, 500 ml of dimethyl sulfoxide, a certain amount of deionized water, and the volume of deionized water is the same as that of 2 The volume ratio of methyl sulfoxide is (1:50~1:15); firstly add potassium hydroxide, then add deionized water, stir with magnetic stirrer for 5min~20min, then add aramid chopped fibers and The order of addition of dimethyl sulfoxide was placed in a sealed beaker, and a magnetic stirrer was used to stir and react for 2h to 4h at a rotational speed of 1200r / min to 1500r / min, to obtain a mass concentration of 0.2% dispersed in dimethyl sulfoxide. The aramid nanofiber dispersion in the aramid nanofiber, wherein the diameter of the aramid nanofiber is 12-15nm and the length is 4-7μm;

[0033] Step 2: Prepare th...

Embodiment 1

[0040] A conductive aramid nanofiber composite aerogel, the conductive aramid nanofiber composite aerogel is composed of aramid nanofibers and carbon nanotubes, and the mass ratio of aramid nanofibers to carbon nanotubes is 70: 30; the mass of the conductive aramid nanofiber composite aerogel is 1000mg, and the density is 50mg / cm 3 .

[0041] A preparation method of conductive aramid nanofiber composite aerogel, comprising the following steps:

[0042] Step 1: Prepare aramid nanofiber dispersion, mix 1 g of aramid chopped fibers with a length of 6 mm, 1.5 g of potassium hydroxide, 500 ml of dimethyl sulfoxide, a certain amount of deionized water, and the volume of deionized water is the same as that of 2 The volume ratio of methyl sulfoxide is 1:50; according to the order of adding potassium hydroxide first, then adding deionized water, mixing and stirring with a magnetic stirrer for 5 minutes, then adding aramid chopped fibers and dimethyl sulfoxide in turn It was placed in...

Embodiment 2

[0048] A conductive aramid nanofiber composite aerogel, the conductive aramid nanofiber composite aerogel is composed of aramid nanofibers and carbon nanotubes, and the mass ratio of aramid nanofibers to carbon nanotubes is 65: 35; the conductive aramid nanofiber composite aerogel has a mass of 800 mg and a density of 45 mg / cm 3 .

[0049] A preparation method of conductive aramid nanofiber composite aerogel, comprising the following steps:

[0050] Step 1: Prepare aramid nanofiber dispersion, mix 1 g of aramid chopped fibers with a length of 6 mm, 1.5 g of potassium hydroxide, 500 ml of dimethyl sulfoxide, a certain amount of deionized water, and the volume of deionized water is the same as that of 2 The volume ratio of methyl sulfoxide is 1:40; according to the order of adding potassium hydroxide first, then adding deionized water, mixing and stirring with a magnetic stirrer for 8 minutes, then adding aramid chopped fibers and dimethyl sulfoxide in turn It was placed in a ...

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Abstract

The invention discloses a conductive aramid nanofiber composite aerogel and a preparation method thereof. The aramid nanofiber with nanoscale structure, high strength, large aspect ratio and high temperature resistance is used as a matrix to have high Whisker carbon nanotubes with crystallinity and high rigidity structure are used as conductive fillers and reinforcing filler materials to prepare conductive aramid nanofiber composite aerogels with low density, high strength and high compression resilience, including the preparation of aramid fibers Nanofiber dispersion, preparation of whisker carbon nanotube dispersion, preparation of whisker carbon nanotube / aramid nanofiber composite dispersion, preparation of gelatinous whisker carbon nanotube / aramid nanofiber composite material, etc., to obtain conductive Aramid nanofiber composite aerogel. The preparation process of the invention is simple and feasible, and the obtained conductive aramid nanofiber composite aerogel has broad application prospects in the fields of pressure sensing, smart sensors, wearable devices and the like.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials and strain sensors, in particular to a conductive aramid nanofiber composite aerogel and a preparation method thereof. Background technique [0002] Due to its high porosity, low density, and controllable three-dimensional porous structure, aerogels show broad application prospects in the fields of adsorption, heat insulation, and energy storage. Conductive aerogels not only have the advantages of the above-mentioned aerogels, but also have great application potential in the fields of fuel cells, catalysis, supercapacitors, sensors, and wearable devices due to their excellent electrical conductivity. At present, most of the conventional conductive aerogels are carbon-based aerogels obtained by pyrolysis at high temperature (>1000 °C). Oxygen-free and other harsh conditions, so it is usually impossible to mass-produce. In addition, traditional carbon-based aerogels often exhibit lower mech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L77/10C08L39/06C08K7/06G01B7/16
CPCC08J9/28G01B7/16C08J2377/10C08J2439/06C08K2201/011C08K2201/003C08K2201/004C08K2201/001C08K7/06C08J2205/026C08J2201/0482C08J2201/0484
Inventor 杨斌王琳张美云谭蕉君宋顺喜丁雪瑶
Owner SHAANXI UNIV OF SCI & TECH
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