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Cellulose nanofiber/carbon fluoride tube flexible composite film and preparation method thereof

A nanofiber and cellulose technology, applied in plant fiber, fiber treatment, inorganic compound addition, etc., to achieve the effects of simple preparation conditions, convenient operation, and broad application prospects

Active Publication Date: 2020-05-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon fluoride tubes are extremely hydrophobic, and their uniform dispersion has become a serious challenge.

Method used

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  • Cellulose nanofiber/carbon fluoride tube flexible composite film and preparation method thereof
  • Cellulose nanofiber/carbon fluoride tube flexible composite film and preparation method thereof
  • Cellulose nanofiber/carbon fluoride tube flexible composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 4 g of cellulose products, 50 mg of TEMPO, 0.5 g of sodium bromide and 2.976 g of sodium hypochlorite into 400 ml of deionized water, then stir at room temperature for 6 h, during which time 0.5 mol / L of hydroxide is used to Sodium is used to regulate the pH value of the mixture to maintain around 10. The oxidized cellulose is filtered and washed. Then re-disperse in water and conduct probe ultrasonication for 30min. Then it was centrifuged at 8000 rpm for 10 min, and the supernatant was obtained as the oxidatively separated cellulose nanofibers (denoted as NFC). Prepare NFC aqueous solution with a concentration of 2 mg / ml.

[0027] (2) Add the diluted NFC aqueous dispersion to the membrane pumping device, use the mixed cellulose acetate as the base membrane, and control the vacuum degree to 0.1 MPa. After the film pumping is completed, soak in acetone to remove the base film, and dry naturally to obtain a pure NFC composite film.

[0028] figure 1 Shown ...

Embodiment 2

[0030](1) Weigh 4 g of cellulose products, 50 mg of TEMPO, 0.5 g of sodium bromide and 2.976 g of sodium hypochlorite into 400 ml of deionized water, then stir at room temperature for 6 h, during which time 0.5 mol / L of hydroxide is used to Sodium is used to regulate the pH value of the mixture to maintain around 10. The oxidized cellulose is filtered and washed. Then re-disperse in water and conduct probe ultrasonication for 30min. Then it was centrifuged at 8000 rpm for 10 min, and the supernatant was obtained as the oxidatively separated cellulose nanofibers (denoted as NFC). The concentration of the NFC aqueous solution was configured to be 2 mg / ml.

[0031] (2) Weigh 30 mg of fluorinated carbon nanotubes (denoted as FCNT) and 30 ml of NFC aqueous solution into 50 ml of deionized water, and sonicate the probe for 5 min to obtain a uniform dispersion of FCNT / NFC.

[0032] (3) Add the uniformly dispersed FCNT / NFC aqueous dispersion to the membrane pumping device, use the ...

Embodiment 3

[0035] (1) Weigh 4 g of cellulose products, 50 mg of TEMPO, 0.5 g of sodium bromide and 2.976 g of sodium hypochlorite into 400 ml of deionized water, then stir at room temperature for 6 h, during which time 0.5 mol / L of hydroxide is used to Sodium is used to regulate the pH value of the mixture to maintain around 10. The oxidized cellulose is filtered and washed. Then re-disperse in water and conduct probe ultrasonication for 30min. Then it was centrifuged at 8000 rpm for 10 min, and the supernatant was obtained as the oxidatively separated cellulose nanofibers (denoted as NFC). The concentration of the NFC aqueous solution was configured to be 2 mg / ml.

[0036] (2) Weigh 5 mg of fluorinated carbon nanotubes (referred to as FCNT) and 30 ml of NFC in water and add them to 50 ml of deionized water. The probe is sonicated for 5 min to obtain a uniform dispersion of FCNT / NFC.

[0037] (3) Add the uniformly dispersed FCNT / NFC aqueous dispersion to the membrane pumping device, u...

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Abstract

The invention belongs to the technical field of a heat-conducting composite material and particularly relates to a cellulose nanofiber / fluorinated carbon tube flexible composite membrane and a preparation method thereof. The preparation method comprises the following steps: firstly, promoting dispersion of a fluorinated carbon tube in water through TEMPO oxidation separated cellulose nanofiber toobtain uniform fluorinated carbon tube dispersing liquid; secondly, promoting a self-assembling technology by utilizing vacuum filtration to obtain a flexible heat-conducting composite membrane, wherein one-dimensional fluorinated carbon tubes and one-dimensional cellulose nano-cellulose are stacked along the in-plane direction layer by layer. The composite membrane still has excellent heat-conducting property while maintaining high insulating property; and the in-plane thermal conductivity reaches to 14.04 W / mK and the vertical in-plane thermal conductivity reaches to 0.83 W / mK when the fluorinated carbon tube content is 35 percent by weight. The fluorinated carbon tube serves as heat-conducting filler, and the heat-conducting property of the composite membrane has higher competitivenesscompared with that of the published similar study. The method is simple in operation, lower in production cost and easy in batch and large-scale production, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting composite materials, and in particular relates to a flexible heat-conducting composite film of cellulose nanofibers and carbon fluoride tubes and a preparation method thereof. Background technique [0002] With the development of various power electronic devices, especially some portable or wearable electronic devices, towards integration and high power, they will inevitably generate a lot of heat during their work. If the heat cannot be dissipated in a timely and effective manner, it will seriously affect the life of the equipment, work stability and even safety. Therefore, it is of great significance to develop and utilize some flexible insulating and thermally conductive films that can be used in portable and wearable electronic devices. [0003] Recently, many ceramic filler-based polymer composite thermal insulating materials have been extensively studied. However, these composite m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/69D06M11/30D06M11/13D06M13/388D06M101/06
CPCD06M11/13D06M11/30D06M13/388D06M2101/06D21H17/69
Inventor 王雄伟武培怡
Owner FUDAN UNIV