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A kind of polydimethylsiloxane/nanometer cellulose composite film and preparation method thereof

A technology of polydimethylsiloxane and dimethylsiloxane, which is applied in the field of polydimethylsiloxane/nanocellulose composite film and its preparation, and can solve problems such as poor mechanical strength and easy breakage

Active Publication Date: 2021-04-23
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that polydimethylsiloxane has poor mechanical strength and is easy to break under the action of external force, such as tensile force, and provides a polydimethylsiloxane / nanocellulose composite film And provide the preparation method of this composite film

Method used

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  • A kind of polydimethylsiloxane/nanometer cellulose composite film and preparation method thereof
  • A kind of polydimethylsiloxane/nanometer cellulose composite film and preparation method thereof
  • A kind of polydimethylsiloxane/nanometer cellulose composite film and preparation method thereof

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preparation example Construction

[0034] A preparation method of polydimethylsiloxane / nanocellulose composite film, comprising the following process steps:

[0035] S01 Extraction of cellulose from bamboo powder

[0036] Preparation of Nanocellulose by S02 Mechanical Grinding-High Pressure Homogenization

[0037] Preparation of Nanocellulose Membrane by S03 Vacuum Filtration

[0038] Preparation of Polydimethylsiloxane / Nanocellulose Composite Membrane by S04 Solvent Displacement-Dipping Method

[0039] The step S01 extracts cellulose from bamboo powder, and has the following process steps:

[0040] (1) Add an appropriate amount of 80-100 mesh bamboo powder into deionized water, prepare 1700-2000ml of a suspension with a mass fraction of 1-1.5wt%, and stir magnetically for 0.5-1h to fully contact the bamboo powder with deionized water. Set 10h~12h.

[0041] (2) Weigh an appropriate amount of sodium chlorite to prepare a sodium chlorite solution with a concentration of 0.8-1 wt%; weigh the acetic acid soluti...

Embodiment 1

[0062] A kind of polydimethylsiloxane / nanometer cellulose composite membrane, is made up of following process steps:

[0063] (1) Add 10 g of 80-mesh bamboo powder into deionized water, prepare a suspension with a mass fraction of 1 wt%, stir it magnetically for 0.5 h, make the bamboo powder fully contact with deionized water, and let stand for 10 h.

[0064] (2) Weigh 10g of sodium chlorite and make it into a sodium chlorite solution with a concentration of 0.8wt%; weigh the acetic acid solution with a mass ratio of sodium chlorite and acetic acid solution of 4:1, first take the required solution Add 1 / 3 into the beaker of (1), heat and stir in a water bath at 80°C for 1 hour, then add the remaining solution in 2 times according to the above process, and vacuum filter the obtained sample with a Buchner funnel. Then rinse repeatedly with deionized water, and vacuum filter the sample with a Buchner funnel until the filtered solution is neutral.

[0065] (3) Weigh potassium hyd...

Embodiment 2

[0073] In Example 2, the impregnation concentration of polydimethylsiloxane is 1 wt%, that is, the nanocellulose membrane is dipped in a 1 wt% polydimethylsiloxane prepolymer solution, and then cured by heating. The polydimethylsiloxane content in the prepared polydimethylsiloxane / nanocellulose composite film was calculated to be 23.7%±4.1%. The polydimethylsiloxane / nanocellulose composite film was cut into a width of 5 mm and a length of 35 mm. Measure and record the thickness and width of the sample, clamp the sample between the fixtures, and ensure that the span is between 20-30mm. The universal mechanical testing machine (Model3365; Instron Corp., Canton, MA) was set with a load of 1 kN and a loading speed of 2 mm / min to test the tensile strength and Young's modulus of the samples. The test results of tensile properties show that the elongation at break of the composite film is 3.03%, the modulus of elasticity is 1617MPa, and the tensile strength is 32MPa; the elongation ...

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Abstract

The invention relates to a preparation method of a polydimethylsiloxane / nanocellulose composite film, comprising the following steps: S01 extracting cellulose, S02 preparing nanocellulose, S03 preparing nanocellulose film, and S04 preparing polydimethylsiloxane oxane / nanocellulose composite film. It also relates to the polydimethylsiloxane / nanometer cellulose composite film prepared by the method, and the film has better flexibility.

Description

technical field [0001] The invention relates to a composite film and a preparation method thereof, in particular to a polydimethylsiloxane / nanocellulose composite film and a preparation method thereof. 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, and has applications in various fields such as medicine, food, and construction. The disadvantage of polydimethylsiloxane is that its mechanical strength is poor, and it is easy to break under the action of external force, such as tensile force. Therefore, further improving its mechanical properties will help to broaden its application in biosensors, wearable flexible energy storage devices And the applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/04C08L83/04
CPCC08J5/18C08J2301/04C08J2383/04
Inventor 陈楚楚卜香婷王怡仁王然靳昊李大纲
Owner NANJING FORESTRY UNIV
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