Bacterial cellulose nanocrystalline/chiral azobenzene composite film and preparation method thereof

A technology of bacterial cellulose and azobenzene, which is applied in the field of bacterial cellulose nanocrystal/chiral azobenzene composite film and its preparation, can solve the problems such as difficult adjustment of pitch and liquid crystal control, and achieve green and environmental protection in the production process , Easy to operate, simple condition control effect

Inactive Publication Date: 2019-12-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent (Application No. CN201510773696.6) "Preparation method of cellulose nanocrystal cholesteric liquid crystal texture anti-counterfeit mark", the self-assembly of cellulose contain

Method used

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  • Bacterial cellulose nanocrystalline/chiral azobenzene composite film and preparation method thereof
  • Bacterial cellulose nanocrystalline/chiral azobenzene composite film and preparation method thereof

Examples

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Example Embodiment

[0043] Example 1

[0044] A preparation method of bacterial cellulose nanocrystal / chiral azobenzene composite film includes the following steps:

[0045] (1) Add the dry bacterial cellulose (10g) and 150g of a 64wt% concentrated sulfuric acid solution to a three-necked flask and mix, and then conduct the hydrolysis reaction under a stirring state of 300r / min. The temperature of the hydrolysis reaction is 50 ℃, the hydrolysis reaction time is 50min, after the hydrolysis reaction is over, pour it into a beaker, add 10 times the volume of the concentrated sulfuric acid solution to deionized water to stop the sulfuric acid hydrolysis, mix well to obtain a white emulsion;

[0046] (2) Centrifuge the emulsion described in step (1), the rotation speed of the centrifugal treatment is 10000r / min, the time of the centrifugal treatment is 8min, and the upper suspension is taken;

[0047] (3) Pour the suspension described in step (2) into a dialysis bag (with a molecular weight cut-off of 14000) ...

Example Embodiment

[0051] Example 2

[0052] A preparation method of bacterial cellulose nanocrystal / chiral azobenzene composite film includes the following steps:

[0053] (1) Add absolutely dry bacterial cellulose (10g) and 200g of concentrated sulfuric acid solution with a mass percentage concentration of 55wt% into a three-necked flask and mix, and then conduct the hydrolysis reaction under stirring at 350r / min. The temperature of the hydrolysis reaction is 60°C, the hydrolysis reaction time is 1h. After the hydrolysis reaction is completed, pour it into a beaker, add 12 times the volume of the concentrated sulfuric acid solution to deionized water to stop the sulfuric acid hydrolysis, mix well to obtain a white emulsion;

[0054] (2) Centrifuge the emulsion described in step (1), the rotation speed of the centrifugal treatment is 10000r / min, the time of the centrifugal treatment is 10min, and the upper suspension is taken;

[0055] (3) Pour the suspension described in step (2) into a dialysis bag (...

Example Embodiment

[0059] Example 3

[0060] A preparation method of bacterial cellulose nanocrystal / chiral azobenzene composite film includes the following steps:

[0061] (1) Add absolutely dry bacterial cellulose (10g) and 150g of concentrated sulfuric acid solution with a mass percentage concentration of 70wt% into a three-necked flask and mix, and then conduct the hydrolysis reaction under stirring at 250r / min. The temperature of the hydrolysis reaction is At 40°C, the hydrolysis reaction time is 40min. After the hydrolysis reaction is completed, pour it into a beaker, add 15 times the volume of concentrated sulfuric acid solution to deionized water to stop the hydrolysis of sulfuric acid, mix well to obtain a white emulsion;

[0062] (2) Centrifuge the emulsion described in step (1), the rotation speed of the centrifugal treatment is 9000 r / min, the time of the centrifugal treatment is 12 min, and the upper suspension is taken;

[0063] (3) Pour the suspension of step (2) into a dialysis bag (with...

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Abstract

The invention discloses a bacterial cellulose nanocrystalline/chiral azobenzene composite film and a preparation method thereof. The method comprises the following steps: hydrolyzing bacterial cellulose by a sulfuric acid method to obtain a bacterial cellulose nanocrystalline suspension, chemically synthesizing chiral azobenzene with a long biphenyl rigid chain, mixing the prepared bacterial cellulose nanocrystalline suspension with a chiral azobenzene solution, evaporating the uniformly mixed suspension under a condition that the temperature is 30 DEG C and the humidity is 60%, and performingself-assembly to form a film, thereby obtaining the bacterial cellulose nanocrystalline/chiral azobenzene composite film. According to the preparation method provided by the invention, the adopted evaporation-induced self-assembly method is convenient to operate, and is simple in condition control and good in controllability. The bacterial cellulose nanocrystalline/chiral azobenzene composite film has color change and morphology change under regulation and control of light, and can be used as a functional film material to be applied to the fields of photonic devices, intelligent display, photosensitive devices and the like.

Description

technical field [0001] The invention belongs to the field of functional membrane materials, and in particular relates to a bacterial cellulose nanocrystal / chiral azobenzene composite membrane and a preparation method thereof. Background technique [0002] Bacterial cellulose is a new type of fiber obtained after microbial treatment. It has three-dimensional space network structure, high crystallinity, high air permeability, good biocompatibility, high mechanical strength, and good biodegradability. These excellent The characteristics make bacterial cellulose widely used in various research fields. Cellulose nanocrystals prepared by bacterial cellulose through the sulfuric acid method can form both nematic liquid crystal and chiral nematic liquid crystal under certain conditions. This characteristic provides many possibilities for bacterial cellulose in the field of liquid crystal film formation . [0003] Chiral azobenzene materials have unique structural characteristics. ...

Claims

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Application Information

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IPC IPC(8): C08L1/04C08K5/23C08J5/18C09K19/38C09K19/02
CPCC08J5/18C08J2301/04C08K5/23C09K19/02C09K19/3819
Inventor 王斌段承良李金鹏葛洲陈克复曾劲松徐峻高文花
Owner SOUTH CHINA UNIV OF TECH
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