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A kind of nanocellulose-based composite membrane and its preparation method and use

A nanocellulose and nanofiber technology, applied in the field of materials, can solve the problems of single function, low strength of pure nanocellulose membrane, restricting the development of nanocellulose, etc., to expand the application range, excellent humidity response ability, and realize high value The effect of using

Active Publication Date: 2022-05-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure nanocellulose membranes have limitations of low strength and single function, which limit the development of nanocellulose in the field of emerging smart materials.
How to introduce functional materials into nanocellulose to endow the body with high mechanical properties and multifunctionality without affecting the humidity response is a huge challenge.

Method used

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  • A kind of nanocellulose-based composite membrane and its preparation method and use
  • A kind of nanocellulose-based composite membrane and its preparation method and use
  • A kind of nanocellulose-based composite membrane and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The 0.3 wt% aqueous solution of micene nanosheets and the 0.3 wt% aqueous nanofiber dispersion liquid are stirred and mixed according to the macene content of 75% to obtain a uniform nanofiber-micene nanosheet mixed solution; then, the tannic acid solution is mixed. Drop into the mixed solution of nanofiber filaments and micene nanosheets, the mass of tannic acid is 2.5% of that of nanocellulose, and stir at room temperature for 6-12 hours to obtain a uniform mixed solution; take 12 ml of the uniform mixed solution and place it in a Vacuum filtration in the filter cup, natural drying for 6 hours, and carefully peeled off from the polytetrafluoroethylene filter membrane to obtain a nanocellulose composite membrane with a thickness of 15 μm. The nanocellulose composite membrane has a mechanical strength of up to 260 MPa, bends 180° in 6s in response to humidity stimuli, and has Joule heating and antibacterial capabilities. It can be used as smart clothes to effectively di...

Embodiment 2

[0051] The nanocellulose composite film was prepared according to the same procedure as in Example 1, except that the mass of tannic acid was 5% of the nanocellulose. The mechanical strength of the nanocellulose composite membrane can reach 275.4MPa, and it can bend 180° in 3.5s in response to humidity stimulation, and can achieve a temperature increase of 17°C by applying a voltage of 5V, and is resistant to Escherichia coli and Staphylococcus aureus. Applying it to smart clothes can effectively dissipate moisture and lower the temperature by 1.8°C in summer or during vigorous exercise; supply voltage in winter to achieve thermal insulation.

Embodiment 3

[0053] The nanocellulose composite membrane was prepared according to the same procedure as in Example 1, except that the mass of tannic acid was 10% of the nanocellulose. The nanocellulose-based composite membrane has a mechanical strength of up to 248.2 MPa, bends 180° in 4.5 s in response to humidity stimuli, and has Joule heating and antibacterial capabilities. Applying it to smart clothes can effectively dissipate moisture and lower the temperature by 1.5 °C in summer or during vigorous exercise; in winter, supply voltage can achieve thermal insulation.

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Abstract

A nanocellulose-based composite membrane, comprising nanofibrous filaments, micene nanosheets, and polyphenolic compounds, and forming a uniform film-like structure through hydrogen bonding, prepared by the following steps: 1) taking nanofibrous filaments, micene nanosheets, and flakes and polyphenolic compounds, respectively prepared into nanofiber filament dispersion liquid, micene nanosheet dispersion liquid, and polyphenolic compound dispersion liquid; 2) mixing nanofiber filament dispersion liquid and micene nanosheet dispersion liquid to obtain a mixed solution 3) drop the polyphenolic compound dispersion into the mixed solution of step 2), and stir for 6-12h to obtain a uniform mixed solution; 4) filter the uniformly mixed solution with suction, and dry the filter cake for 6-8h to obtain a thickness of 10‑30μm nanocellulose-based composite membrane. The nanocellulose-based composite film prepared by the invention has high mechanical strength and excellent Joule heat and antibacterial properties.

Description

technical field [0001] The invention relates to the field of materials, in particular to a nanocellulose-based composite membrane and a preparation method and application thereof. Background technique [0002] In today's society pursuing green energy saving and intelligence, researchers have succeeded in being inspired by biological behaviors (chameleons automatically change body color to resist foreign enemies, mate, and forage; Venus flytrap controls the opening and closing of leaves to catch food, etc.) Various intelligent actuators capable of reversibly deforming in response to external stimuli (such as humidity, electricity, light, temperature, magnetism) have been designed and developed. In particular, humidity-responsive actuators have attracted much attention due to their environmental friendliness and humidity availability, and have great development potential in many cutting-edge fields, including smart wearables, soft robots, artificial muscles, energy converters,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/04C08K3/14C08K5/1545C08K5/18
CPCC08J5/18C08J2301/04C08K3/14C08K2201/011C08K5/1545C08K5/18C08K2201/005
Inventor 邵自强魏洁贾帅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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