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Flexible luminescent material and preparation method and application thereof

A luminescent material and flexible technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of insignificant mechanical responsiveness, hinder the practical application of cellulose nanocrystalline films, limited elongation at break, etc., and achieve good mechanical response. performance, good application prospects, high efficiency and fast cost

Inactive Publication Date: 2019-08-30
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent rigidity of cellulose nanocrystals, the cellulose nanocrystal film with a monochromatic structure makes the film material brittle and has limited elongation at break, which hinders the practical application of cellulose nanocrystal films, especially in fields such as wearable sensors
The photonic resin templated with cellulose nanocrystals is prepared by in-situ polymerization, but because the resin is insoluble in water, the prepared film needs to etch away the cellulose nanocrystals and only leave the polymer film, so the preparation process is complicated. And the cost is high, the environmental pollution is large, and the elongation at break of the stretched film is limited, and the mechanical response is not significant

Method used

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  • Flexible luminescent material and preparation method and application thereof
  • Flexible luminescent material and preparation method and application thereof
  • Flexible luminescent material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of flexible luminescent materials

[0034] (1) Cotton was treated with 2% NaOH solution, then hydrolyzed with 64% sulfuric acid, washed 5 times, and dialyzed to pH 5.0 to obtain a cellulose nanocrystal suspension.

[0035] (2) The cellulose nanocrystal suspension prepared in the step (1) is ultrasonically treated under the condition of 300W and 40kHz at a power of 300W for 10min, and polyacrylamide is dissolved in the suspension to obtain a mixed solution. In the mixed solution The mass fraction of polyacrylamide is 1%, and the mass fraction of cellulose nanocrystals is 0.5%. The mixed solution is again subjected to ultrasonic treatment for 10 min under the condition of power of 300W and frequency of 40kHz, and then left to stand until there are no bubbles in the mixed solution. Then vertically immerse the substrate in the mixed liquid, and after standing still for 5 days under the condition of temperature of 30° C. and humidity of 30%, a thin film is formed...

Embodiment 2

[0037] Preparation of flexible luminescent materials

[0038] (1) Cotton was treated with 2% NaOH solution, then hydrolyzed with 64% sulfuric acid, washed 5 times, and dialyzed to pH 7.0 to obtain a cellulose nanocrystal suspension.

[0039] (2) The cellulose nanocrystal suspension prepared in the step (1) was subjected to an ultrasonic treatment for 15 min at a power of 200W and a frequency of 37kHz, and polyvinyl alcohol was dissolved in the suspension to obtain a mixed solution. In the mixed solution The mass fraction of polyvinyl alcohol is 2%, and the mass fraction of cellulose nanocrystals is 2%. The mixed solution is once again subjected to ultrasonic treatment for 10 min under the condition of 200W power and 37kHz frequency, and then left to stand until there is no bubble in the mixed solution. Then vertically immerse the substrate in the mixed liquid, and after standing for 3 days at a temperature of 35° C. and a humidity of 20%, a thin film is formed on the substrate...

Embodiment 3

[0041] Preparation of flexible luminescent materials

[0042] (1) Cotton was treated with 2% NaOH solution, then hydrolyzed with 64% sulfuric acid, washed three times, and dialyzed to pH 6.0 to obtain a cellulose nanocrystal suspension.

[0043] (2) The cellulose nanocrystal suspension prepared in the step (1) is treated at a power of 300W and a frequency of 40kHz for 10min, and polyvinyl alcohol is dissolved in the suspension to obtain a mixed solution. In the mixed solution The mass fraction of polyvinyl alcohol is 3%, the mass fraction of cellulose nanocrystals is 2%, the mixed solution is once again under the condition of power 300W, and the frequency is 40kHz under the condition of sonication for 10min and then left to stand until there is no bubble in the mixed solution. Then vertically immerse the substrate in the mixed solution, and after standing still for 5 days under the conditions of a temperature of 30° C. and a humidity of 20%, a thin film is formed on the substr...

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Abstract

The invention relates to a flexible luminescent material and a preparation method and application thereof, and belongs to the technical field of luminescent material preparation. The preparation method of the material is as follows: dissolving water-soluble polymer in ultrasonically-treated cellulose nanocrystal or surface functionalization-modified cellulose nanocrystal suspension to obtain a mixed solution, ultrasonically treating the mixed solution again, standing until no bubbles are in the mixed solution, then vertically immersing a substrate in the mixed solution, and standing for 3-5 dunder the conditions that the temperature is 25-35 DEG C and the humidity is 20-50% thus forming a film on the substrate to obtain the flexible luminescent material. The material is degradable and environmentally friendly, has good mechanical responsiveness, and has good application prospect in anti-counterfeiting, sensing and other aspects, and a preparation process of the flexible luminescent material is simple, efficient, fast and low-cost, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of luminescent material preparation, and in particular relates to a flexible luminescent material and its preparation method and application. Background technique [0002] Cellulose, which is abundant and renewable, and its crystalline form, cellulose nanocrystals, is widely used as a reinforcing agent. When evaporated, the aqueous suspension of cellulose nanocrystals can form a structure in which the chiral nematic type remains in the cured film, and the film with a highly ordered and periodic chiral nematic structure can selectively reflect circularly polarized light, resulting in Structural color appearance. One advantage of photonic films based on cellulose nanocrystals over other films is that the structural color can be easily tuned by various additives. However, because the assembly period of the cellulose nanocrystal film is too small, the diffraction wavelength changes too fast, resulting in an ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L33/26C08L1/02C08L29/04C08L39/06C08L1/28C08L79/02C08L71/02C08L33/24C08L1/12C09K11/02C09K11/06
CPCC08J5/18C08J2301/02C08J2301/28C08J2329/04C08J2333/24C08J2333/26C08J2339/06C08J2371/02C08J2401/02C08J2401/12C08J2401/28C08J2479/02C09K11/025C09K11/06C09K2211/1088
Inventor 黄进甘霖刘思源
Owner SOUTHWEST UNIV