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Method for preparing cellulose composite aerogel

A technology of composite aerogel and cellulose, which is applied in the field of fine chemical materials to achieve the effects of less solvent pollution, wide source of raw materials and low price

Inactive Publication Date: 2012-05-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of carbon materials as modifiers to enhance cellulose composite aerogels has not been reported

Method used

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  • Method for preparing cellulose composite aerogel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Sodium hydroxide / thiourea / water is formulated according to the ratio of 9.5:4.5:86. After freezing for 8 hours at -8°C, add cellulose dried in a vacuum oven at 50°C for 24 hours. The viscosity-average molecular weight is 5.4×10 4 , at room temperature using a stirring rate of 3000 rpm mechanical stirring for 5 minutes to prepare a concentration of 10% cellulose solution, then add 0.1% graphene oxide relative to the cellulose mass, the surface area and thickness of graphene oxide About 100:1, ultrasonic dispersion for 1 hour to obtain a composite solution. The composite solution was left at room temperature for half an hour to obtain a composite gel, and the gel was placed in deionized water to exchange the solvent, and the water was changed every 1 hour until the pH value of the exchange water reached neutrality. Then the obtained solid was freeze-dried at -50°C, 60Pa for 24 hours to obtain the final cellulose composite airgel. The compression performance test results ...

Embodiment 2

[0022] Sodium hydroxide / thiourea / water is prepared according to the ratio of 10:6:84. After freezing for 15 hours at -8°C, add cellulose, and its viscosity-average molecular weight is 5.4×10 4 , at room temperature using a stirring rate of 5000 rev / min mechanical stirring for 10 minutes to prepare a cellulose solution with a concentration of 10%, then add 0.1% single-walled carbon nanotubes relative to the cellulose mass, the aspect ratio is about 50:1, ultrasonic dispersion for 1 hour to obtain a complex solution. Place the composite solution at room temperature for half an hour to obtain a composite gel and place the gel in 5% sulfuric acid solution for 5 minutes, then put it into deionized water to exchange the solvent, and change the water every 1 hour until the pH value of the exchange water Reach 8. The resulting solid was then freeze-dried for 12 hours to obtain the final cellulose composite airgel. The compressive performance test results show that the compressive st...

Embodiment 3

[0024] Others are the same as in Example 1, but the solvent used is sodium hydroxide / urea / water in a proportion of 9:5:85 as a solution. Compared with the pure cellulose aerogel, the compressive strength and modulus of the final prepared cellulose composite airgel were increased by 12 and 30%, respectively.

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Abstract

The invention belongs to the field of fine chemical materials, and more particularly relates to a method for preparing cellulose composite aerogel. The method is mainly characterized by taking a carbon material as a modifying agent, and comprises the following main processes of: firstly dissolving cellulose in a sodium hydroxide / thiourea aqueous solution, a sodium hydroxide / urea aqueous solution or other solvents to prepare a cellulose solution with a certain concentration, adding a carbon nanotube (CNT), graphene oxide (GOS), reduced graphene oxide (rGO) and other modifying agents, standing for carrying out gelation, carrying out solvent exchange on the obtained gel, and drying the composite gel to obtain the cellulose composite aerogel. The preparation technique provided by the invention has a simple process and convenience for operation, and can obviously shorten the time of forming the gel from the solution; and the prepared composite aerogel has higher compressive strength and modulus as well as good heat stability, and has wide application prospects in the biomedical, biological sensing and detecting and other fields.

Description

technical field [0001] The invention belongs to the field of fine chemical materials, and in particular relates to a method for preparing cellulose composite airgel. The method mainly shortens the gelation time by adding a carbon-based modifier capable of interacting with cellulose, and obtains a composite airgel with the characteristics of high strength, high modulus, good thermal stability and the like. This preparation technology has important applications in fields such as biosensing, biomedicine loading and biodevices. Background technique [0002] Cellulose is widely used in food, biomedicine, packaging materials and other fields due to its abundant content in nature, environmental friendliness and renewable characteristics. In recent years, environmental and energy issues have become increasingly severe, and the research on high-performance materials based on cellulose materials has received more extensive attention. Among many cellulose materials, cellulose aerogel...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L1/02C08K3/04
Inventor 冯嘉春张菁曹也文
Owner FUDAN UNIV
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