Preparation method of cellulose-based flexible stress-strain sensitive material

A technology of sensitive materials and cellulose, applied in the direction of measuring force, instruments, measuring devices, etc., can solve problems such as high cost, environmental pollution, resource shortage and so on

Inactive Publication Date: 2016-06-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the research reports on flexible stress sensors are based on nanomaterials such as ZnO nanowires, gold-silver nanowires, carbon nanotubes, graphene, etc., but these flexible stress sensors generally have problems such as complex preparation process and high cost.
[0003] In addition, with the rapid development of the global economy in recent years, a large amount of non-renewable resources such as coal and oil have been continuously consumed, resulting in a shortage of resources; at the same time, a large amount of CO 2 , SO 2 The emission of harmful gases such as pollution pollutes the environment and triggers the "greenhouse effect", which seriously threatens the living environment of human beings.

Method used

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  • Preparation method of cellulose-based flexible stress-strain sensitive material
  • Preparation method of cellulose-based flexible stress-strain sensitive material
  • Preparation method of cellulose-based flexible stress-strain sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ① Add 10 g of pulp cellulose to 1000 g of water, and stir for 1 hour with a mixer to form a uniform solution to obtain a 1 wt % pulp cellulose aqueous solution.

[0026] ② The pulp cellulose aqueous solution prepared in step ① is frozen into a solid, and then dried by a freeze dryer to obtain the cellulose airgel.

[0027] ③ The cellulose airgel prepared in step ② was cracked under nitrogen protection at 800° C. for 2 hours to obtain a cellulose-based carbon gel material.

[0028] ④The carbon gel material prepared in step ③ was poured with 1.2 times the volume of PDMS resin, vacuum degassed, and then cured at 80°C for 1 hour to obtain a flexible stress-strain sensitive material based on cellulose.

[0029] The scanning electron microscope (TEM) photos of the prepared cellulose carbon sol are as follows: figure 2 As can be seen from the figure: the cellulose carbon sol prepared by the present invention has a large number of voids, a large number of contact points betwe...

Embodiment 2

[0031] ① Add 2 g of cellulose nanocrystals to 1000 g of water, and use an ultrasonic instrument to sonicate for 30 minutes to form a uniform solution to obtain a 0.2 wt % aqueous solution of cellulose nanocrystals.

[0032] ② The cellulose nanocrystal aqueous solution prepared in step ① is frozen into a solid, and then dried by a freeze dryer to obtain the cellulose aerogel.

[0033] ③ The cellulose airgel prepared in step ② was cracked under the protection of argon at 1000° C. for 0.5 hour to obtain a cellulose-based carbon gel material.

[0034] ④Pouring polymethylsiloxane resin (Sylgard184, DowCorning) with 1 times its volume on the carbon gel material prepared in step ③, vacuum defoaming, and then curing at 80°C for 1h, the cellulose-based flexible stress - Strain sensitive materials.

[0035] The cellulose carbon sol prepared by using the method provided by the invention has a three-dimensional network structure, and the conductivity is 0.82Sm -1 . The prepared stress-...

Embodiment 3

[0037] ①Add 50g of chitin cellulose to 1000g of water, and stir for 5 hours with a mixer to form a homogeneous solution to obtain a 5wt% chitin cellulose aqueous solution.

[0038] ② The chitin cellulose aqueous solution prepared in step ① is frozen to become solid, and then dried by a freeze dryer to obtain the cellulose airgel.

[0039] ③ The cellulose airgel prepared in step ② was cracked under vacuum at 600° C. for 5 hours to obtain a cellulose-based carbon gel material.

[0040] ④The carbon gel material prepared in step ③ was poured with PDMS resin twice its volume, vacuum degassed, and then cured at 80°C for 1 hour to obtain a flexible stress-strain sensitive material based on cellulose.

[0041] The cellulose carbon sol prepared by the method provided by the invention has a three-dimensional network structure, and the conductivity is 0.0012Sm -1 . The prepared stress-strain sensitive material has good flexibility, and the electrical resistance of the material is sensi...

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Abstract

The invention provides a preparation method of a cellulose-based flexible stress-strain sensitive material. The preparation method comprises the steps of: 1) adding cellulose into water and mixing uniformly to form a 0.2-5wt% aqueous solution, and freeze-drying the aqueous solution to prepare a cellulose aerogel; 2) subjecting the cellulose aerogel prepared in the step 1) to pyrolysis processing at high temperature of 600-1000 DEG C for 0.5 to 5 hours under the protection of vacuum or inert atmosphere to prepare a carbon gel; 3) and pouring PDMS resin in the carbon gel, and carrying out vacuum defoamation, thereby the flexible stress-strain sensitive material with high sensitivity is obtained after resin is solidified. The preparation method has the advantages of rich, chip and renewable raw materials, simple and controllable preparation process, and wide strain range and high sensitivity of the prepared stress-strain sensitive material; and the preparation method has good application prospect in aspects of structural health monitoring, electronic skin, biological medicine, wearable electronic product and the like.

Description

technical field [0001] The invention relates to a preparation method of a stress-strain sensitive material, more specifically, the invention relates to a preparation method of a cellulose-based flexible stress-strain sensitive material, which can be used as a core element of a flexible stress-strain sensor. Background technique [0002] Pressure sensors are the most common sensors in various fields, and are widely used in aerospace, military industry, transportation, construction, medical health and other fields. Traditional stress sensors (such as electrical resistance strain gauges, semiconductor strain gauges, etc.) have the problems of poor flexibility and low strain range, and it is difficult to adapt to the requirements of the new generation of sensors in terms of flexibility and convenience, and their application range is limited. The new flexible stress sensor has a soft substrate, which can adapt to complex uneven surfaces and withstand large deformations, which gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22C04B35/524
Inventor 李元庆付绍云
Owner CHONGQING UNIV
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