Preparation method of cellulose nanocrystal and chitosan composite membrane

A technology of nanocrystals and cellulose, which is applied in the field of preparation of cellulose nanocrystals/chitosan composite membranes, can solve the problems of uneven dispersion and poor mechanical properties, and achieve simple process, less pollution, good mechanical properties and water resistance The effect of swelling properties

Active Publication Date: 2016-06-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the dispersion of CNC in the chitosan matrix is ​​not uniform, and the mechanical properties of the prepared CNC / chitosan composite film are worse than those of the chitosan homogeneous film.

Method used

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  • Preparation method of cellulose nanocrystal and chitosan composite membrane
  • Preparation method of cellulose nanocrystal and chitosan composite membrane
  • Preparation method of cellulose nanocrystal and chitosan composite membrane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] (4) Preparation of CDAC / chitosan composite film.

[0018] Each performance of CDAC / chitosan composite membrane of the present invention can adopt following index to detect:

[0019] The cellulose nanocrystals before and after modification were diluted to a solute mass fraction of 0.5% and dispersed ultrasonically, and a drop of the solution was dropped on a copper grid and dried. Under the condition of an accelerating voltage of 80KV, the morphology was observed with a transmission electron microscope (JEM-2100, JEOL Ltd.).

[0020] Put the CDAC / chitosan composite film into a constant temperature and humidity chamber (temperature is 25°C, relative humidity is 65%) to balance for 48h, and cut into strips with a width of 1cm; Calculate the average value of 5 points to test the thickness of the film, and use a computer-controlled universal material testing machine (WDW-20 Shanghai Hualong Testing Instrument Co., Ltd.) to measure the tensile breaking strength and elongatio...

Embodiment 1

[0025] (1) Add 1 part of microcrystalline cellulose to 20 parts of 64% concentrated sulfuric acid, mechanically stir at 45°C and 600r / min for 1 hour, and centrifuge at 10000r / min at high speed to collect the upper layer of white CNC sol, dialyze for 3 days and then add 0.1N sodium hydroxide solution adjusts the pH of the sol to 6.5;

[0026] (2) Add 3 parts of sodium periodate to the CNC sol prepared in step (1), react at 45°C for 5 hours in the dark; add 3 parts of ethylene glycol to react for 1 hour and dialyze for 5 days to obtain dialdehyde cellulose Nanocrystalline (DAC) sol;

[0027] (3) 4 parts of Geraldt reagent T were added to the DAC sol prepared in step (3), and reacted at 60°C for 5 hours; after dialysis for 5 days, a cationized cellulose nanocrystal (CDAC) sol was obtained;

[0028] (4) 1 part of chitosan is dissolved in 100 parts of 1% (w / v) acetic acid solution at room temperature, 4.5 parts of CDAC sol prepared by step (3) are mixed with chitosan acetic acid s...

Embodiment 2

[0030] (1) Add 1 part of microcrystalline cellulose to 20 parts of 64% concentrated sulfuric acid, mechanically stir at 45°C and 600r / min for 1 hour, and centrifuge at 10000r / min at high speed to collect the upper layer of white CNC sol, dialyze for 3 days and then add 0.1N sodium hydroxide solution adjusts the pH of the sol to 6.5;

[0031] (2) Add 3 parts of sodium periodate to the CNC sol prepared in step (1), react at 45°C for 5 hours in the dark; add 3 parts of ethylene glycol to react for 1 hour and dialyze for 5 days to obtain dialdehyde cellulose Nanocrystalline (DAC) sol;

[0032] (3) 4 parts of Geraldt reagent T were added to the DAC sol prepared in step (3), and reacted at 60°C for 5 hours; after dialysis for 5 days, a cationized cellulose nanocrystal (CDAC) sol was obtained;

[0033] (4) 1 part of chitosan is dissolved in 100 parts of 1% (w / v) acetic acid solution at room temperature, and 9 parts of CDAC sols prepared in step (3) are mixed evenly with chitosan ace...

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Abstract

The invention discloses a preparation method of a cellulose nanocrystal and chitosan composite membrane, and belongs to the field of modification of natural polymers. The method comprises the steps that cellulose nanocrystal (CNC) sol is prepared by conducting concentrated sulfuric acid hydrolysis on microcrystalline cellulose; the cellulose nanocrystal (CNC) sol is reacted with sodium periodate to prepare dialdehyde cellulose nanocrystal (DAC) sol and the cellulose nanocrystal (CNC) sol is reacted with a Girard's reagent T to prepare cationic cellulose nanocrystal (CDAC) sol. The CDAC sol is directly mixed with a chitosan-acetic acid solution, vacuum defoamation tape casting is conducted in a polytetrafluoroethylene mold, drying at room temperature is conducted, and the membrane is obtained. Compared with a pure chitosan membrane, the mechanical property of the prepared cellulose nanocrystal and chitosan composite membrane can be obviously improved, and the swelling degree in water is obviously reduced.

Description

technical field [0001] The invention relates to a preparation method of a cellulose nanocrystal / chitosan composite film, which belongs to the field of modification of natural macromolecules. Background technique [0002] Chitosan is the deacetylation product of chitin, which has the characteristics of non-toxic, biodegradable and biocompatible. In recent years, membrane materials made of chitosan have been widely used in the fields of material separation, biological materials, drug release, environmental protection, food preservation, cell culture and other fields. Chitosan film is easy to prepare, has strong alkali resistance and organic solvent resistance, and has certain corrosion resistance after crosslinking. However, after chitosan is formed into a film alone, it is easy to curl, shrink and brittle in dry weather, and absorb water in wet weather. [0003] Cellulose is the most abundant natural polymer on earth, and strong acid hydrolysis of cellulose can produce rod-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/08C08L5/08C08B15/06
CPCC08B15/06C08J5/18C08J2301/08C08J2405/08C08L1/08C08L2203/16C08L5/08
Inventor 田秀枝蒋学闫德东王树根
Owner JIANGNAN UNIV
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