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Bacterial cellulose nano fiber based directionally-arranged macro fiber and preparation method thereof

A technology of bacterial cellulose and nanofibers, which is applied to artificial filaments made of cellulose derivatives, chemical post-processing of cellulose/protein artificial filaments, etc., can solve the problems that the excellent properties of nanocellulose are not fully exhibited. Achieve strong cross-linking, improve Young's modulus and tensile strength, and increase the effect of force

Active Publication Date: 2016-09-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bacterial cellulose nanofibers have a high aspect ratio (>100) and high crystallinity (>80%), which makes the nanofibers have excellent mechanical properties, with a Young's modulus of 114 GPa, but reported disordered bacterial cellulose The Young's modulus of the film can only reach about 10GPa, which is far lower than the theoretical value, and does not fully express the excellent performance of nanocellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for preparing macroscopic fibers with directional arrangement of bacterial cellulose nanofiber bases. First, a high-speed homogenizer is used to crush and beat bacterial cellulose wet film at a rate of 4000rpm / min to obtain bacterial cellulose slurry; then the TEMPO / NaBr aqueous solution is dripped Add to bacterial cellulose slurry, adjust the pH value of slurry to 9.5, wherein, TEMPO, NaBr and H 2 The mass ratio of O is 1:6:600, the mass ratio of TEMPO and bacterial cellulose is 1:60, continue to add the NaClO solution that concentration is 5wt%, the mass ratio of TEMPO and NaClO is 1:125, control the pH value of slurry 10, mechanically stirred and reacted for 0.5 hour; then centrifuged and concentrated to form an aqueous suspension, the solid content of the suspension was 1wt%, wherein the degree of polymerization of bacterial cellulose was 250, the diameter of bacterial cellulose nanofibers was 15nm, and the length was 5.1 μm , the content of carboxyl groups...

Embodiment 2

[0051] A method for preparing macroscopic fibers with directional arrangement of bacterial cellulose nanofiber bases, first using a roller mill to pulverize and beat bacterial cellulose wet film at a rate of 5000rpm / min to obtain bacterial cellulose slurry; then add TEMPO / NaBr aqueous solution dropwise In the bacterial cellulose slurry, adjust the pH value of the slurry to 10.5, wherein, TEMPO, NaBr and H 2 The mass ratio of O is 1:10:600, the mass ratio of TEMPO and bacterial cellulose is 1:120, continue to add the NaClO solution that concentration is 10wt%, the mass ratio of TEMPO and NaClO is 1:250, control the pH value of slurry 10.5, mechanically stirred and reacted for 2 hours; then centrifuged and concentrated to form an aqueous suspension, the solid content of the suspension was 2wt%, wherein the degree of polymerization of bacterial cellulose was 300, the diameter of bacterial cellulose nanofibers was 18nm, and the length was 5.2 μm , the content of carboxyl groups in...

Embodiment 3

[0054] A method for preparing macroscopic fibers with directional arrangement of bacterial cellulose nanofiber bases, first using a microfluidic jet high-pressure homogenizer to pulverize and beat bacterial cellulose wet film at a rate of 6000rpm / min to obtain bacterial cellulose slurry; then TEMPO / NaBr aqueous solution was added dropwise to the bacterial cellulose slurry, and the pH value of the slurry was adjusted to 10, wherein TEMPO, NaBr and H 2 The mass ratio of O is 1:7:600, the mass ratio of TEMPO and bacterial cellulose is 1:70, continue to add the NaClO solution that concentration is 6wt%, the mass ratio of TEMPO and NaClO is 1:150, control the pH value of slurry 10.2, mechanically stirred and reacted for 1 hour; then centrifuged and concentrated to form an aqueous suspension, the solid content of the suspension was 3wt%, wherein the degree of polymerization of bacterial cellulose was 350, the diameter of bacterial cellulose nanofibers was 20nm, and the length was 5....

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Abstract

The invention relates to a bacterial cellulose nano fiber based directionally-arranged macro fiber and a preparation method thereof. Oxidized and homogeneous bacterial cellulose nano fibers are directionally arranged and assembled into the nano fiber based macro fiber under the action of a shear force by adopting a wet-spinning forming and crosslinking process. A system method for continuously preparing a bacterial cellulose nano fiber based directionally-arranged one-dimensional flexible material is established by regulating and controlling the structures, sizes and dispersion degree of the nano fibers, the order degree of the nano fibers and the acting force of the nano fibers. The macro fiber prepared by adopting the method has a strong mutual acting force, the highest Young modulus of the macro fiber can be up to 24 GPa, the tensile strength can be up to 398 MPa, accordingly the excellent mechanical properties and flexibility of the bacterial cellulose nano fibers are effectively widened from nano scale to macro size, and the bacterial cellulose nano fiber based directionally-arranged macro fiber having high crystallinity degree (cellulose I crystal form) and high performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparing macroscopic fibers from nanofibers, and relates to macroscopic fibers with directional arrangement of bacterial cellulose nanofiber bases and a preparation method thereof. Background technique [0002] The research and development of bio-based fibers is of great significance to the sustainable development of the industry and even the country. With the growth of the global population, the human demand for energy continues to increase, and the reduction of non-renewable resources is a problem that human beings have to face in the future development. Therefore, the pursuit of renewable energy and raw materials is a global development trend, and the biomanufacturing industry will be a strategic field that will affect the future. "The Twelfth Five-Year Plan for the Development of National Strategic Emerging Industries" lists the bio-industry as one of the seven strategic emerging industries; the "Tw...

Claims

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Application Information

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IPC IPC(8): D01F2/24D01F11/02
CPCD01F2/24D01F11/02
Inventor 王华平姚晶晶陈仕艳王宝秀关方怡陈燕江振林
Owner DONGHUA UNIV
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