Conductive aramid nanofiber composite aerogel and preparation method thereof
A composite aerogel and nanofiber technology, applied in electromagnetic measurement devices, electric/magnetic solid deformation measurement and other directions, can solve the problem of poor compression resilience, aramid nanofiber aerogels have no electrical conductivity, and cannot be applied to pressure sensors. and other problems, to achieve the effect of high compression resilience, simple and easy preparation process, and high strength
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[0031] A preparation method of conductive type aramid fiber nanofiber composite airgel, comprising the following steps:
[0032] Step 1: prepare aramid nanofiber dispersion liquid, 1g length is the aramid fiber chopped fiber of 6mm, 1.5g potassium hydroxide, 500ml dimethyl sulfoxide, a certain amount of deionized water, the volume of deionized water and two The volume ratio of methyl sulfoxide is (1:50~1:15); add potassium hydroxide first, then add deionized water, and stir with a magnetic stirrer for 5min~20min, then add aramid chopped fiber and The order of adding dimethyl sulfoxide is placed in a sealed beaker, and the magnetic stirrer is used to stir the reaction at a speed of 1200r / min to 1500r / min for 2h to 4h to obtain a mass concentration of 0.2% dispersed in dimethyl sulfoxide. Aramid nanofiber dispersion liquid in, wherein the diameter of aramid nanofiber is 12-15nm, and the length is 4-7μm;
[0033] Step 2: Prepare whisker carbon nanotube dispersion liquid: whisker...
Embodiment 1
[0040] A conductive aramid nanofiber composite airgel, the conductive aramid nanofiber composite airgel is composed of aramid nanofibers and carbon nanotubes, and the mass ratio of the aramid nanofibers to carbon nanotubes is 70: 30; The mass of the conductive aramid nanofiber composite airgel is 1000 mg, and the density is 50 mg / cm 3 .
[0041] A preparation method of conductive type aramid fiber nanofiber composite airgel, comprising the following steps:
[0042] Step 1: prepare aramid nanofiber dispersion liquid, 1g length is the aramid fiber chopped fiber of 6mm, 1.5g potassium hydroxide, 500ml dimethyl sulfoxide, a certain amount of deionized water, the volume of deionized water and two The volume ratio of methyl sulfoxide is 1:50; according to the order of adding potassium hydroxide first, then adding deionized water, stirring with a magnetic stirrer for 5 minutes, and then adding aramid chopped fiber and dimethyl sulfoxide in sequence Place in a sealed beaker, and use...
Embodiment 2
[0048] A conductive aramid nanofiber composite airgel, the conductive aramid nanofiber composite airgel is composed of aramid nanofibers and carbon nanotubes, and the mass ratio of the aramid nanofibers to carbon nanotubes is 65: 35; The mass of the conductive aramid nanofiber composite airgel is 800mg, and the density is 45mg / cm 3 .
[0049] A preparation method of conductive type aramid fiber nanofiber composite airgel, comprising the following steps:
[0050] Step 1: prepare aramid nanofiber dispersion liquid, 1g length is the aramid fiber chopped fiber of 6mm, 1.5g potassium hydroxide, 500ml dimethyl sulfoxide, a certain amount of deionized water, the volume of deionized water and two The volume ratio of methyl sulfoxide is 1:40; according to the order of adding potassium hydroxide first, then adding deionized water, stirring with a magnetic stirrer for 8 minutes, and then adding aramid chopped fiber and dimethyl sulfoxide in sequence Place it in a sealed beaker, and use...
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