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Method for preparing NCC/CS/PVA composite nano-membrane

A nano-crystal, polyvinyl alcohol technology, applied in spinning solution preparation, textiles and papermaking, non-woven fabrics, etc., to achieve good biocompatibility

Active Publication Date: 2014-06-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no reports on the preparation of new nano-microcrystalline cellulose / chitosan / polyvinyl alcohol composite nanofiber membranes by using nano-cellulose as a green organic enhancer by sol-gel method and electrospinning technology

Method used

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  • Method for preparing NCC/CS/PVA composite nano-membrane
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  • Method for preparing NCC/CS/PVA composite nano-membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of nanocrystalline cellulose: Weigh 5 g of microcrystalline cellulose (MCC) into 50 ml of deionized water. The MCC mixture was placed in an ice-water bath, 87 g of concentrated sulfuric acid was added dropwise, heated and stirred at 44 °C for 2 h, and then 1500 ml of deionized water was quickly added to terminate the reaction. The mixture was left to stand for 3 days, during which time the supernatant was poured off 3 times, and an equal amount of deionized water was added each time to let it stand again. The resulting final suspension was centrifuged repeatedly 5 times (5 min, 10000 rpm). The centrifuged mixed solution was dialyzed until the pH of the solution outside the dialysis bag was close to 7. Pour out the solution in the dialysis bag, sonicate for 20 min, and finally lyophilize into powder;

[0023] (2) Prepare a 3wt% chitosan solution with 1 mol / L acetic acid;

[0024] (3) Mix the nano-microcrystalline cellulose prepared in step (1) with the...

Embodiment 2

[0031] (1) Preparation of nanocrystalline cellulose: Weigh 5 g of microcrystalline cellulose (MCC) into 50 ml of deionized water. The MCC mixture was placed in an ice-water bath, 87 g of concentrated sulfuric acid was added dropwise, heated and stirred at 44 °C for 2 h, and then 1500 ml of deionized water was quickly added to terminate the reaction. The mixture was left to stand for 3 days, during which time the supernatant was poured off 3 times, and an equal amount of deionized water was added each time to let it stand again. The resulting final suspension was centrifuged repeatedly 5 times (5 min, 10000 rpm). The centrifuged mixed solution was dialyzed until the pH of the solution outside the dialysis bag was close to 7. Pour out the solution in the dialysis bag, sonicate for 20 minutes, and finally lyophilize into powder;

[0032] (2) Prepare a 3wt% chitosan solution with 1 mol / L acetic acid;

[0033] (3) Mix the nano-microcrystalline cellulose prepared in step (1) with...

Embodiment 3

[0041] (1) Preparation of nanocrystalline cellulose: Weigh 5 g of microcrystalline cellulose (MCC) into 50 ml of deionized water. The MCC mixture was placed in an ice-water bath, 87 g of concentrated sulfuric acid was added dropwise, heated and stirred at 44 °C for 2 h, and then 1500 ml of deionized water was quickly added to terminate the reaction. The mixture was left to stand for 3 days, during which time the supernatant was poured off 3 times, and an equal amount of deionized water was added each time to let it stand again. The resulting final suspension was centrifuged repeatedly 5 times (5 min, 10000 rpm). The centrifuged mixed solution was dialyzed until the pH of the solution outside the dialysis bag was close to 7. Pour out the solution in the dialysis bag, sonicate for 20 min, and finally lyophilize into powder;

[0042] (2) Prepare a 3wt% chitosan solution with 1 mol / L acetic acid;

[0043] (3) Mix the nanocrystalline cellulose prepared in step (1) with the chito...

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Abstract

The invention relates to a method for preparing an NCC / CS / PVA composite nanofiber membrane. NCC is rod-shaped particles, wherein the diameter of each particle ranges from 20 nm to 60 nm, and the particles are highly crystallized. The method comprises the steps that (1) an NCC / CS solution is prepared, wherein the concentration of the NCC, by weight, ranges from 0.09% to 0.21%; (2) an NCC / PVA solution is prepared, wherein the concentration of the NCC, by weight, ranges from 0.4% to 0.8%; (3) an acetic acid solution, tetraethyl orthosilicate, the NCC / CS solution obtained in the step (1) and processed through ultrasound, and the NCC / PVA solution obtained in the step (2) and processed through ultrasound are mixed to obtain a spinning solution, and the nanofiber membrane is obtained through the electrospinning technology, wherein the mass ratio of the acetic acid solution to the tetraethyl orthosilicate to the NCC / CS solution to the NCC / PVA solution is (2.5-3.5):(1.5-2.5):5:5; (4) the obtained nanofiber membrane is immersed in an alkaline solution for 2-6 hours at the normal temperature, and the membrane structure can be stable. The method for preparing the NCC / CS / PVA composite nanofiber membrane has the advantages that the nanofiber material preparation process is simple, the preparation process is environmentally friendly and free of pollution, nanofibers are excellent in mechanical performance, the surface of the nanofiber membrane is rich in modifiable functional groups, and the nanofiber membrane has a remarkable affinity effect on biomacromolecule.

Description

technical field [0001] The invention relates to a preparation technology of a composite nanofiber film, in particular to a preparation method of a nano-microcrystalline cellulose / chitosan / polyvinyl alcohol composite nano film. Background technique [0002] Cellulose is the most abundant biodegradable and renewable natural polymer material in the world. The annual growth of plant cellulose on the earth is as high as hundreds of millions of tons, exceeding the total existing oil reserves. Nanocrystalline cellulose (NCC) can be obtained by degrading cellulose raw materials with mixed acid or sulfuric acid. In addition to the wide range of sources, it also has a series of superior characteristics: small particle size, large specific surface area (150-250 m 2 / g), high tensile strength (7500 MPa), strong hardness (Young's modulus 100-140 GPa), and the hydroxyl groups on its surface make it easy to carry out subsequent chemical modification and chemical bonding. At the same tim...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/728D01D1/02
Inventor 徐冉李风亭刘思佳
Owner TONGJI UNIV
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