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A kind of nanocellulose/carbon nanotube/polydimethylsiloxane conductive composite film and preparation method thereof

A composite technology of dimethylsiloxane and carbon nanotubes, applied in the field of conductive composite film and its preparation, nanocellulose/carbon nanotube/polydimethylsiloxane conductive composite film, can solve the problem of carbon The nanotube wall is prone to damage, the electron transmission path is disconnected, and the enhancement effect cannot be achieved. It achieves the effect of low price, easy processing and large mechanical deformation

Active Publication Date: 2021-02-02
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Introducing carbon nanotubes into polymer substrates can endow them with electrical conductivity. However, carbon nanotubes have a large specific surface area, strong van der Waals force and π-π conjugation between the tubes, and are prone to agglomeration in polymers, resulting in It is easy to slip and fall during the stress process, resulting in stress concentration, which cannot achieve the reinforcement effect
Moreover, the density of conductive paths formed by low-concentration carbon nanotubes in polymers is low, which limits the improvement of its conductive properties.
The traditional dispersion method needs to "chemically modify" carbon nanotubes, but this method not only increases the preparation price of carbon nanotubes, but also easily destroys the walls of carbon nanotubes during the modification process, making it difficult for electron transport The path is broken, resulting in a decrease in conductivity

Method used

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preparation example Construction

[0029] A preparation method of nanocellulose / carbon nanotube / polydimethylsiloxane conductive composite film, comprising the following process steps:

[0030] (a) Extraction of cellulose from wood flour

[0031] (b) One-time mechanical grinding method to prepare nanocellulose

[0032] (c) Preparation of nanocellulose / carbon nanotube composite membrane by ultrasonic dispersion-vacuum filtration method

[0033] (d) Preparation of nanocellulose / carbon nanotubes / polydimethylsiloxane conductive composite film by impregnation method

[0034] The step (a) extracting cellulose from wood flour has the following process steps:

[0035] (1) Take an appropriate amount of 60~100 mesh wood powder in a beaker, add an appropriate amount of deionized water, and prepare a 1600~1800ml suspension with a mass fraction of 1.5~2.0wt%. Stir with a glass rod to make the wood powder and deionized water fully Contact, let stand for 12h.

[0036] (2) Acid treatment to remove lignin: Weigh an appropria...

Embodiment 1

[0050] A nanocellulose / carbon nanotube / polydimethylsiloxane conductive composite film is composed of the following process steps:

[0051] (1) Take 20g of 60-mesh wood powder in a beaker, add appropriate amount of deionized water to make a suspension with a mass fraction of 1.5wt%, stir with a glass rod to make the wood powder fully contact with deionized water, and let it stand for 12 hours.

[0052] (2) Acid treatment to remove lignin: Weigh 15g of 80% sodium chlorite and deionized water to prepare a sodium chlorite solution with a concentration of 0.7wt%; according to the mass ratio of sodium chlorite and acetic acid solution Weigh the acetic acid solution at a ratio of 5:1, stir it evenly and add it into the beaker of (1), heat and stir in a water bath at 75°C for 1 hour, repeat this process four times; The resulting sample was filtered until the sample was neutral.

[0053] (3) Alkali treatment to remove hemicellulose: Prepare 500ml of potassium hydroxide solution with a...

Embodiment 2

[0064] A nanocellulose / carbon nanotube / polydimethylsiloxane conductive composite film is composed of the following process steps:

[0065] (1) Take 30g of 80-mesh wood powder in a beaker, add appropriate amount of deionized water to make a suspension with a mass fraction of 1.8wt%, stir with a glass rod to make the wood powder fully contact with deionized water, and let it stand for 12 hours.

[0066] (2) Acid treatment to remove lignin: Weigh 18g of 80% sodium chlorite and deionized water to prepare a sodium chlorite solution with a concentration of 0.8wt%; according to the mass ratio of sodium chlorite and acetic acid solution Weigh the acetic acid solution at a ratio of 5:1, stir it evenly and add it into the beaker of (1), heat and stir in a water bath at 80°C for 1 hour, repeat this process four times; The resulting sample was filtered until the sample was neutral.

[0067] (3) Alkali treatment to remove hemicellulose: Prepare 600ml of potassium hydroxide solution with a...

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Abstract

The invention relates to a method for preparing a nanocellulose / carbon nanotube / polydimethylsiloxane conductive composite film, and the conductive composite film prepared by the method. The preparation method comprises the following steps: extracting cellulose from wood powder Preparation of nanocellulose by mechanical grinding method; preparation of nanocellulose / carbon nanotube composite film; preparation of nanocellulose / carbon nanotube / polydimethylsiloxane conductive composite film by impregnation method; preparation of nanocellulose / carbon nanotube by this method The carbon nanotube / polydimethylsiloxane conductive composite film has good flexibility and conductivity.

Description

technical field [0001] The invention relates to a conductive composite film and a preparation method thereof, in particular to a preparation method of a nanocellulose / carbon nanotube / polydimethylsiloxane conductive composite film, which belongs to the field of new energy and electronic materials. Background technique [0002] Polydimethylsiloxane is a hydrophobic high-molecular organic polymer with a silicon-oxygen structure as the main chain. It has good tensile properties and biocompatibility. It can be used without destroying the molecular chain structure. Withstanding large mechanical deformation, it is an ideal matrix material for stretchable electronic devices. Polydimethylsiloxane exhibits high elongation at break in terms of tensile properties, but its low elastic modulus and tensile strength severely limit its application in the research field of stretchable energy electronics. [0003] As the main chemical component of plant fiber raw materials, cellulose is the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/00C08J5/18C08L1/02C08L83/04C08K3/04
CPCC08J5/18C08J7/00C08J2301/02C08J2483/04C08K2201/011C08K3/041
Inventor 陈楚楚卜香婷王怡仁罗德丹刘育绮李大纲
Owner NANJING FORESTRY UNIV
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