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A kind of preparation method of cellulose nanopaper with circularly polarized fluorescence emission

A fluorescence emission, cellulose technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as non-ideal brittleness, affecting the mechanical properties of nanoparticles, fragmentation, etc.

Active Publication Date: 2022-03-11
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CNCs nanoparticles become fragmented in the final stage of the EISA process
The undesired brittleness is actually a significant defect. On the other hand, the incompatibility of the interface between lanthanide compounds and CNCs also seriously affects the mechanical properties of nanoparticles. However, only a few researchers have focused on the mechanical brittleness of nano-CNCs. They Use water-soluble polymers such as polyethylene glycol, polyvinyl alcohol, CNFs, amphiphilic surfactants as plasticizers to improve their mechanical properties

Method used

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  • A kind of preparation method of cellulose nanopaper with circularly polarized fluorescence emission
  • A kind of preparation method of cellulose nanopaper with circularly polarized fluorescence emission
  • A kind of preparation method of cellulose nanopaper with circularly polarized fluorescence emission

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preparation example Construction

[0032] A kind of preparation method of the cellulose nano paper of circularly polarized fluorescence emission of the present invention, specifically comprises the following steps:

[0033] Step 1, synthesizing 4-(4-vinylbenzyl)acetophenone (VBAP). Specifically: add 4-vinylbenzyl chloride (2-200mmol), 4-hydroxyacetophenone (4-400mmol), potassium hydroxide (4-400mmol) and N,N-dimethyl formamide (2-200mL) to obtain a mixed solution A, then stirred at 45°C for 12h under nitrogen, after the reaction, cooled the mixed solution A to room temperature, and used deionized water (20-2000mL) to precipitate the mixed solution A, It was then washed with deionized water, filtered, and dried in a vacuum oven at 45°C to obtain 4-(4-vinylbenzyl)acetophenone (VBAP) crude oil, which was recrystallized with ether to purify VBAP.

[0034] Step 2, synthesis of 1-(4-(4-vinylbenzyl)phenyl)-trifluorobutane-1,3-dione (VBTF);

[0035] Dissolve ethyl trifluoroacetate (1-100mmol) and sodium hydride (1-10...

Embodiment 1

[0044] Step 1, synthesizing 4-(4-vinylbenzyl)acetophenone (VBAP). Specifically: add 4-vinylbenzyl chloride (2mmol), 4-hydroxyacetophenone (4mmol), potassium hydroxide (4mmol) and N,N-dimethylformamide (2mL) to the reflux device respectively, The mixed solution A was obtained, and then stirred at 45° C. for 12 h under nitrogen. After the reaction, the mixed solution A was cooled to room temperature, and the mixed solution A was precipitated with deionized water (20 mL), then washed with deionized water, and filtered. The crude oil of 4-(4-vinylbenzyl)acetophenone (VBAP) was obtained by drying in a vacuum oven at 45° C., and the VBAP was purified by recrystallization with ether, with a yield of 93.2%.

[0045] Step 2, synthesis of 1-(4-(4-vinylbenzyl) phenyl)-trifluorobutane-1,3-dione (VBTF); ethyl trifluoroacetate (1mmol) and sodium hydride ( 1mmol) was dissolved in tetrahydrofuran (3mL), and stirred at room temperature for 10min to obtain a mixed solution B. The VBAP (0.5mmol...

Embodiment 2

[0053] Step 1, synthesizing 4-(4-vinylbenzyl)acetophenone (VBAP). Specifically: add 4-vinylbenzyl chloride (2mmol), 4-hydroxyacetophenone (4mmol), potassium hydroxide (4mmol) and N,N-dimethylformamide (2mL) to the reflux device respectively, The mixed solution A was obtained, and then stirred at 45° C. for 12 h under nitrogen. After the reaction, the mixed solution A was cooled to room temperature, and the mixed solution A was precipitated with deionized water (20 mL), then washed with deionized water, and filtered. The crude oil of 4-(4-vinylbenzyl)acetophenone (VBAP) was obtained by drying in a vacuum oven at 45° C., and the VBAP was purified by recrystallization with ether, with a yield of 93.2%.

[0054] Step 2, synthesis of 1-(4-(4-vinylbenzyl) phenyl)-trifluorobutane-1,3-dione (VBTF); ethyl trifluoroacetate (1mmol) and sodium hydride ( 1mmol) was dissolved in tetrahydrofuran (3mL), and stirred at room temperature for 10min to obtain a mixed solution B. The VBAP (0.5mmol...

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Abstract

The invention discloses a preparation method of circularly polarized fluorescent emission cellulose nano paper, specifically comprising the following steps: step 1, synthesizing 4-(4-vinylbenzyl)acetophenone VBAP; step 2, preparing according to step 1 Synthetic 1-(4-(4-vinylbenzyl) phenyl)-trifluorobutane-1,3-diketone VBTF of 4-(4-vinylbenzyl) acetophenone; Step 3, according to step 2. Synthesize the water-soluble polymer PVD from the prepared product; step 4, synthesize the water-soluble lanthanide polymer PVD-Eu according to the product obtained in step 3; step 5, prepare circularly polarized fluorescence-emitting cellulose nanopaper based on the product obtained in step 4. The invention adopts the EISA method to co-assemble the water-soluble lanthanide polymer and the cellulose nano crystal to prepare the toughened and optically adjustable CPL nano material.

Description

technical field [0001] The invention belongs to the technical field of nano-polymer materials, and relates to a preparation method of circularly polarized fluorescence emitting cellulose nano-paper. Background technique [0002] In the past few decades, more and more researchers have begun to pay attention to cellulose, the most abundant natural polymer, and cellulose derivatives have gradually become a substitute for traditional petroleum, thereby reducing environmental pollution caused by petroleum products and excessive consumption of non-renewable resources. Nanocellulose crystal (NCC) is a kind of nanoscale cellulose extracted from natural fibers, which not only has the characteristics of nanoparticles, but also has some unique strength and optical properties, such as biodegradation and biocompatibility, High crystallinity of 55%-95%, high axial tensile modulus of 150GPa, high temperature resistance of 300°C, rich hydroxyl groups can be chemically modified and self-ass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F212/32C08F8/42C08L1/02C08L33/24C09K11/06
CPCC08F220/58C08F8/42C08L1/02C08L33/24C09K11/06C09K2211/182C08F212/32
Inventor 张召李新平刘刚常慧陈奕羽李怡蕾李娜肖钰
Owner SHAANXI UNIV OF SCI & TECH
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