Porous polyvinylidene fluoride-carbon nanotube composite material and preparation method thereof

A polyvinylidene fluoride and carbon nanotube technology, which is applied in the field of porous polyvinylidene fluoride-carbon nanotube composite materials and their preparation, can solve the problems of limiting the wide application of thermoelectric fields, high price, environmental pollution, etc., and achieves reduction of thermal conductivity. coefficient, high Seebeck coefficient, effect of high conductivity

Active Publication Date: 2015-04-22
广东碳语新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, thermoelectric materials with application value are mainly based on Bi 2 Se 3 and Bi 2 Te 3 Mainly inorganic semiconductor materials, their ZT can reach about 1, but the

Method used

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  • Porous polyvinylidene fluoride-carbon nanotube composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A porous polyvinylidene fluoride-carbon nanotube composite material is prepared by the following steps:

[0026] 1) Add 10 g of single-walled carbon nanotubes with a diameter of about 40 to 60 nm and a length of about 5 to 15 μm into a mixed acid of concentrated sulfuric acid (50 ml, a concentration of 98 wt %) and concentrated nitric acid (150 ml, a concentration of 65 wt %), After ultrasonic dispersion for 1 hour, the temperature was raised to 80°C and refluxed at 80°C for 6 hours, then the mixed solution was poured into deionized water for dilution, filtered and dried to obtain black powder, that is, acidified carbon nanotubes.

[0027] 2) Add 1000 mg of the obtained acidified carbon nanotubes and 4 ml of polyethylene glycol-400 into 40 ml of DMF solvent, heat and stir in a water bath at 60 ° C for 4 hours, and then ultrasonically disperse for 2 hours to fully disperse the carbon nanotubes in the DMF solvent , to obtain acidified carbon nanotube dispersion.

[0028]...

Embodiment 2

[0033] A porous polyvinylidene fluoride-carbon nanotube composite material is prepared by the following steps:

[0034] 1) Add 1 mg of multi-walled carbon nanotubes with a diameter of about 40 to 60 nm and a length of about 5 to 15 μm into a mixed acid of concentrated sulfuric acid (50 ml, concentration 98 wt %) and concentrated nitric acid (150 ml, concentration 68 wt %), After ultrasonic dispersion for 0.5 h, the temperature was raised to 60° C. and refluxed for 8 h, then poured into deionized water for dilution, and then subjected to suction filtration and drying to obtain black powder of acidified carbon nanotubes.

[0035]2) Add 2 mg of the obtained acidified carbon nanotubes and 1 ml of polyethylene glycol-400 into 20 ml of DMF (N-N dimethylformamide) solvent, heat and stir in a water bath at 50° C. for 2 h, and then ultrasonically disperse for 1 h to make the carbon The nanotubes are fully dispersed in the DMF solvent to obtain an acidified carbon nanotube dispersion. ...

Embodiment 3

[0040] A porous polyvinylidene fluoride-carbon nanotube composite material is prepared by the following steps:

[0041] 1) Add 500 mg of multi-walled carbon nanotubes with a diameter of about 40 to 60 nm and a length of about 5 to 15 μm into a mixed acid of concentrated sulfuric acid (50 ml, concentration 98 wt %) and concentrated nitric acid (150 ml, concentration 68 wt %), After ultrasonic dispersion for 50 minutes, the temperature was raised to 70° C. and refluxed for 7 hours, then poured into deionized water for dilution, and then subjected to suction filtration and drying to obtain a black powder of acidified carbon nanotubes.

[0042] 2) Add 300 mg of the obtained acidified carbon nanotubes and 1.5 ml of polyethylene glycol-800 into 30 ml of DMF solvent, heat and stir in a water bath at 60°C for 3 hours, and then ultrasonically disperse for 1.5 hours to fully disperse the carbon nanotubes in DMF solvent to obtain acidified carbon nanotube dispersion.

[0043] 3) Add 2.7...

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Abstract

The invention discloses a porous polyvinylidene fluoride-carbon nanotube composite material and a preparation method thereof. The method comprises the following steps: uniformly dispersing carbon nanotubes in a polyvinylidene fluoride base under the action of ultrasonic dispersion to form a conducting network structure, and forming pores in the film forming process of the polyvinylidene fluoride base by utilizing the volatilization of the poor solvent and the phase separation effect of the carbon nanotubes and polyvinylidene fluoride, thereby preparing the porous polyvinylidene fluoride base. By using the porous structure of the polyvinylidene fluoride base, the porous polyvinylidene fluoride-carbon nanotube composite material becomes a poor conductor of heat. The conducting network structure formed by the carbon nanotubes in the polyvinylidene fluoride base can effectively enhance the electric conductivity and Seebeck coefficient of the porous polyvinylidene fluoride-carbon nanotube composite material. The prepared porous polyvinylidene fluoride-carbon nanotube composite material has excellent pyroelectricity.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a porous polyvinylidene fluoride-carbon nanotube composite material and a preparation method thereof. Background technique [0002] Thermoelectric materials are functional materials that convert heat and electricity into each other. The Seebeck effect discovered in 1823 and the Peltier effect discovered in 1834 provided a theoretical basis for the application of thermoelectric energy conversion and thermoelectric refrigeration. Excellent thermoelectric materials must have high Seebeck coefficient, high electrical conductivity and low thermal conductivity, so as to ensure more obvious thermoelectric effect, less Joule heat loss, and maximum heat retention at the contact point, that is, excellent thermoelectricity The material should have a high thermoelectric figure of merit ZT. At present, thermoelectric materials with application value are mainly based on Bi ...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/02C08K7/24C08J9/28C08J5/18
CPCC08J5/18C08J9/286C08J2327/16C08K7/24C08K9/02C08K2201/011C08L27/16C08L2203/16C08L71/02
Inventor 杜飞鹏沈天涵谢岁岁张芳鄢国平李亮郭庆中张桥
Owner 广东碳语新材料有限公司
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