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Preparation method of chiral nematic phase porous aerogel

A chiral nematic phase and airgel technology, applied in the field of material science, can solve the problems of no literature or patent reports, etc., and achieve the effect of simple method and good application prospect

Active Publication Date: 2020-02-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are no documents or patents for nano-cellulose porous airgel with chiral nematic phase structure, which not only retains the raw material of cellulose but also retains the structure of cellulose, and gives full play to the advantages of environmental protection and regeneration of cellulose materials. to report

Method used

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  • Preparation method of chiral nematic phase porous aerogel
  • Preparation method of chiral nematic phase porous aerogel
  • Preparation method of chiral nematic phase porous aerogel

Examples

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Effect test

Embodiment 1

[0034] A method for preparing a nano-cellulose airgel with an ordered chiral nematic phase structure, specifically comprising the following steps:

[0035] (1) Preparation of nanocellulose suspension: add microcrystalline cellulose to 64wt% concentrated sulfuric acid solution, heat and stir for hydrolysis, the heating temperature is 45° C., and the heating time is 1 hour. After the hydrolysis is completed, add water to dilute to terminate the hydrolysis, and let it stand Finally, take out the lower layer of sediment, wash with water and centrifuge 2-3 times, then dialyze to stabilize the pH value to obtain a cellulose suspension, then evaporate and concentrate until the mass fraction of the cellulose suspension is 3 wt%;

[0036] (2) Preparation of nanocellulose film: take 16 g of nanocellulose suspension, add it to a polystyrene watch glass with a diameter of 55 mm, and dry it at 20° C. for 4 days;

[0037] (3) N-methylmorpholine-N-oxide treated nanocellulose film:

[0038] ...

Embodiment 2

[0051] A method for preparing a nano-cellulose airgel with an ordered chiral nematic phase structure, specifically comprising the following steps:

[0052] (1) Preparation of nanocellulose suspension: Add pulp fibers to 36 wt% hydrochloric acid solution, heat and stir for hydrolysis, the heating temperature is 55°C, and the heating time is 1 hour. After the hydrolysis is completed, add water to dilute to terminate the hydrolysis, and take out the lower layer after standing Precipitation, washed with water and centrifuged for 2-3 times, then dialyzed to stabilize the pH value to obtain a cellulose suspension, and then concentrated by evaporation until the mass fraction of the cellulose suspension is 5%;

[0053] (2) Preparation of nanocellulose film: take 16 g of nanocellulose suspension, add it to a polystyrene watch glass with a diameter of 55 mm, and dry it at 20° C. for 4 days;

[0054] (3) N-methylmorpholine-N-oxide treated nanocellulose film:

[0055] 1. Take 0.7g of 25w...

Embodiment 3

[0064] A method for preparing a nano-cellulose airgel with an ordered chiral nematic phase structure, specifically comprising the following steps:

[0065] (1) Preparation of nanocellulose suspension: adding microcrystalline cellulose to 30wt% hydrogen peroxide solution to oxidize and stir for hydrolysis, the oxidation temperature is 30° C., and the oxidation time is 3 hours. After the hydrolysis is completed, add water to dilute to terminate the hydrolysis, and statically After placing, take out the lower sediment, wash with water and centrifuge 2-3 times, then dialyze to stabilize the pH value to obtain a cellulose suspension, then evaporate and concentrate until the mass fraction of the cellulose suspension is 7%;

[0066] (2) Preparation of nanocellulose film: take 16 g of nanocellulose crystal suspension, add it to a polystyrene watch glass with a diameter of 55 mm, and dry it at 20° C. for 4 days;

[0067] (3) Trimethylamine oxide treated nanocellulose film:

[0068] ① ...

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Abstract

The invention relates to a preparation method of a chiral nematic phase porous aerogel. According to the method, a chiral nematic phase nanocellulose film is obtained based on evaporation and self-assembly of a nanocellulose suspension liquid, the film is subjected to soaking and swelling treatment by a cellulose good solvent, a volume of the film is expanded, and a chiral nematic phase pitch is increased significantly. Then the cellulose good solvent in the film is washed and removed with a suitable solvent, and then freeze-drying or supercritical carbon dioxide drying is performed to obtainthe nanocellulose aerogel with a chiral nematic phase structure. The aerogel with an ordered structure can be used as an ordered framework for synthesis of composite materials, can also be used as a hard template to prepare other functional ordered materials, and can also be used to synthesize ordered optical carbon materials and the like. Therefore, the preparation of the nanocellulose aerogel with the chiral nematic phase structure has important application values.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a preparation method of chiral nematic nano-cellulose porous airgel. Background technique [0002] Cellulose is the most abundant renewable polymer in nature. Its nanocrystalline form, that is, cellulose nanocrystalline cellulose, not only has the basic structure and properties of cellulose, but also has a high Young's modulus and a large specific surface area. , high reactivity and strong adsorption capacity. Cellulose is a linear macromolecular polysaccharide composed of D-glucose connected by β-1,4-glycosidic bonds, and dimer cellobiose is the repeating unit of cellulose. Natural cellulose fibers contain amorphous and crystalline regions. The structure of the non-crystalline region is relatively loose, and solutions such as acids, alkalis, and oxidants can easily penetrate into it, so that the cellulose molecules in the non-crystalline region are prefere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08L1/04
CPCC08J9/28C08J2201/0502C08J2201/05C08J2301/02C08J2301/04
Inventor 苑再武张宇
Owner QILU UNIV OF TECH
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