Chiral nematic cellulose nanocrystal-glycerol composite film and preparation method and application thereof

A nanocrystal and chiral nematic technology, which is applied in the field of chiral nematic cellulose nanocrystal-glycerol composite film and its preparation, can solve the problem that the detection effect of humidity sensitive indicator materials is not intuitive, and achieve a good humidity detection effect. Effect

Active Publication Date: 2018-07-24
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the detection effect of the humidity-sensitive indicator material prepared by using cellulose nanocrystals is not intuitive, and it cannot be applied to the field of humidity detection simply and quickly.

Method used

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  • Chiral nematic cellulose nanocrystal-glycerol composite film and preparation method and application thereof
  • Chiral nematic cellulose nanocrystal-glycerol composite film and preparation method and application thereof

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preparation example Construction

[0025] The invention provides a preparation method of a chiral nematic cellulose nanocrystal-glycerol composite film, comprising the following steps:

[0026] Mixing fibers and sulfuric acid for hydrolysis reaction to obtain cellulose nanocrystal suspension;

[0027] The cellulose nanocrystal suspension is washed and concentrated in sequence to obtain a chiral nematic cellulose nanocrystal suspension with a mass concentration of 1.5-5.5%;

[0028] The chiral nematic cellulose nano crystal suspension is mixed with glycerol aqueous solution to form a film to obtain a chiral nematic cellulose nano crystal-glycerol composite film.

[0029] The invention mixes fiber and sulfuric acid to carry out hydrolysis reaction to obtain cellulose nano crystal suspension. In the present invention, the fiber preferably includes pulp fiber, bamboo fiber or microcrystalline cellulose; the pulp fiber preferably includes pulp cotton fiber or kraft bleached coniferous pulp, more preferably pulp cot...

Embodiment 1

[0045] Mix 15g of pulp fiber with 150mL of sulfuric acid with a mass concentration of 70%. Under 700rpm, carry out the hydrolysis reaction in a water bath at 25°C for 1.5h, mix the obtained hydrolyzed material with 1500mL of distilled water, and let it settle for 20h to obtain the supernatant and The lower turbid liquid; the supernatant is poured out, the remaining lower turbid liquid is cleaned with distilled water, and then the obtained material is centrifuged 3 times to obtain a centrifuged material with a pH value of 2.0, wherein the upper layer obtained after each centrifugation Pour it away at night, wash the resulting lower layer of turbid liquid with distilled water, and then perform the next centrifugation, the centrifugal speed is 3000rpm, and the time of single centrifugation is 6min; the obtained centrifuged material is dialyzed for 7 days with a molecular weight cut-off of 8000 to obtain pH The dialysis material with a value of 6.0; the obtained dialysis material i...

Embodiment 2

[0052] Mix 20g of pulp fiber with 250mL of sulfuric acid with a mass concentration of 75%. Under 900rpm, carry out the hydrolysis reaction in a 75°C water bath for 3h, mix the obtained hydrolyzed material with 2500mL of distilled water, and let it settle for 30h to obtain the supernatant and the lower layer. Turbid liquid; pour out the supernatant, wash the remaining lower turbid liquid with distilled water, then centrifuge the obtained material 3 times to obtain a centrifuged material with a pH value of 2.0, wherein the supernatant obtained after each centrifugation Pour it away, wash the resulting lower layer of turbid liquid with distilled water, and then perform the next centrifugation, the centrifugal speed is 5000rpm, and the time of single centrifugation is 7min; the obtained centrifuged material is dialyzed for 5 days with a molecular weight cut-off of 10000 to obtain the pH value The dialysis material is 7.0; the obtained dialysis material is concentrated to a mass con...

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Abstract

The invention provides a chiral nematic cellulose nanocrystal-glycerol composite film preparation method which comprises the steps: mixing fiber with sulfuric acid to perform hydrolysis reaction to obtain cellulose nanocrystal suspension liquid; sequentially washing and concentrating the cellulose nanocrystal suspension liquid to obtain chiral nematic cellulose nanocrystal suspension liquid with amass concentration of 1.5 to 5.5%; mixing the chiral nematic cellulose nanocrystal suspension liquid with a glycerol aqueous solution to form a film to obtain a chiral nematic cellulose nanocrystal-glycerol composite film. The chiral nematic cellulose nanocrystal-glycerol composite film prepared by the preparation method disclosed by the invention not only has the excellent optical characteristicof cellulose nanocrystal, but also has the humidity sensitive characteristic of the glycerol; the chiral nematic cellulose nanocrystal-glycerol composite film has a very good humidity detecting effect when being used as a humidity sensitive indication material; furthermore, raw materials are easy to obtain, and simpleness in operation is achieved.

Description

technical field [0001] The invention relates to the technical field of composite film materials, in particular to a chiral nematic cellulose nanocrystal-glycerol composite film and a preparation method and application thereof. Background technique [0002] Humidity indication is very important in people's production and life, and is widely used in environmental detection, medical electronic equipment, industrial and agricultural production fields. Cellulose nanocrystals (CNCs) widely exist in nature and are environmentally friendly and biocompatible. Materials based on cellulose nanocrystals have good mechanical properties and thermal stability. Through evaporation-induced self-assembly, a chiral nematic liquid crystal phase structure with iridescent properties can be formed, which endows cellulose nanocrystal composites with excellent optical properties. performance. [0003] As the humidity changes, the color of the cellulose nanocrystals will change, and the moisture-se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08K5/053C08J5/18C08B15/02G01N21/78
Inventor 李伟刘守新徐明聪马春慧黄琼涛吴义强李坚
Owner NORTHEAST FORESTRY UNIVERSITY
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