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A kind of preparation method of nanocellulose/graphene nanosheet composite film

A graphene nanosheet and nanocellulose technology, applied in the field of composite materials, can solve the problems of inability to reliably prepare a large number of large-sized graphenes, severe production conditions of epitaxial growth methods, and difficulty in controlling the size of graphenes. Fewer defects, low equipment requirements, and the effect of being conducive to industrialized production

Active Publication Date: 2021-02-19
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of graphene prepared by mechanical exfoliation is not easy to control, and a large amount of large-size graphene cannot be reliably prepared; the production conditions of epitaxial growth method are harsh, and the requirements for equipment are high; the thickness of graphene prepared by orientation epitaxy is not uniform and The interaction between graphene and the substrate will affect the characteristics of graphene; the preparation of graphene oxide by redox method no longer has the large π bond on the surface of graphene, and the oxygen-containing functional group breaks the large π bond and hinders the electron transport efficiency, so Its electrical conductivity is much lower than that of graphene; the electrical properties of reduced graphene oxide are improved compared with graphene oxide, but the structure has defects

Method used

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  • A kind of preparation method of nanocellulose/graphene nanosheet composite film
  • A kind of preparation method of nanocellulose/graphene nanosheet composite film

Examples

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Embodiment 1

[0037] Preparation of nanocellulose / graphene nanosheet composite film, the steps are as follows:

[0038] 1) Preparation of nanocellulose dispersion: take 0.01g TEMPO and 0.1g NaBr, add them together into 1000mL deionized water, stir magnetically at 10°C and 300r / min for 10min to fully mix until TEMPO and NaBr are completely dissolved, Then add 1g of cotton linters to the above system, then add 0.1g NaClO to the system, keep the pH of the system at 9 by dropwise adding 0.1mol / L NaOH solution, react at 10°C for 5h, and oxidize the fiber Then, it was washed with deionized water for more than 3 times, and dried to obtain TEMPO oxidized cellulose; then it was put into a beaker, added with deionized water to disperse, then mechanically stirred for 6 minutes and ultrasonically treated for 12 minutes to obtain a concentration of 0.3%. Nanocellulose dispersion liquid, namely 0.3% nanocellulose dispersion liquid;

[0039]2) Preparation of graphene nanosheets by liquid phase exfoliatio...

Embodiment 2

[0043] Preparation of nanocellulose / graphene nanosheet composite film, the steps are as follows:

[0044] 1) Preparation of nanocellulose dispersion: Take 0.01g TEMPO and 0.01g NaBr, add them together into 100mL deionized water, stir magnetically at 30°C and 600r / min for 20min to make them fully mix until TEMPO and NaBr are completely dissolved, Then add 0.1g of softwood bleached pulp to the above system, then add 1g of NaClO to the system, keep the pH of the system at 11 by adding 0.5mol / L NaOH solution dropwise, react at 30°C for 7h, and then oxidize the fiber Then, it was washed with deionized water for more than 3 times, and dried to obtain TEMPO oxidized cellulose; then it was put into a beaker, added with deionized water to disperse, then mechanically stirred for 6 minutes and ultrasonically treated for 6 minutes to obtain a concentration of 0.5%. Nanocellulose dispersion liquid, namely 0.5% nanocellulose dispersion liquid;

[0045] 2) Preparation of graphene nanosheets...

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Abstract

The invention discloses a method for preparing a nanocellulose / graphene nanosheet composite film, specifically: preparing a nanocellulose dispersion liquid, preparing a graphene nanosheet by a liquid phase exfoliation method, and preparing a nanocellulose / graphene nanosheet composite film membrane. The method adopts a liquid phase exfoliation method to prepare graphene nanosheets, the method is convenient and the exfoliation method without ultrasonic action can obtain natural graphene nanosheets with a size similar to the raw material; the graphene nanosheets with a diameter of 2 to 30nm , and nanocellulose with a length of 100nm to 5μm, the resulting nanocellulose / graphene composite film has high electrical conductivity and mechanical strength, which is of great significance for the development of environmentally friendly and low-cost flexible conductive materials.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing a nanocellulose / graphene nanosheet composite film. Background technique [0002] Nanocellulose is a new type of bio-based highly crystalline nanofiber, which not only has good environmental compatibility, but also has unique properties of nanomaterials. 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO) catalytic oxidation system to extract nanocellulose is an effective and simple method, when TEMPO catalytic oxidation enters into On the surface of cellulose, almost all primary hydroxyl groups at the C6 position can be selectively converted into carboxylate groups to obtain nanocellulose with a high aspect ratio, which can be used in the production of electronic devices and energy storage devices to reduce manufacturing costs and reduce environmental pollution. However, electronic components have certain requirements on the conductivity of the mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/02C08K3/04C01B32/19
Inventor 熊传溪詹阳杨全岭杨俊伟石竹群
Owner WUHAN UNIV OF TECH
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