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CN-122013358-A - Microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber and preparation method thereof

CN122013358ACN 122013358 ACN122013358 ACN 122013358ACN-122013358-A

Abstract

The invention discloses a microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber and a preparation method thereof, and relates to the technical field of structural color fibers, wherein the preparation method of the structural color fiber comprises the following steps of S1, dissolving a cellulose-based cholesteric liquid crystal polymer in a first solvent to obtain a core layer liquid crystal phase solution; and S2, conveying the core layer liquid crystal phase solution through an inner layer channel of the coaxial microfluidic chip, conveying the shell layer solution through an intermediate layer channel, conveying the sheath layer solution through an outer layer channel, and collecting in a coagulating bath to obtain the structural color fiber. The invention realizes the accurate regulation and control of the fiber size through the microfluidic platform, combines a rapid self-assembly and in-situ curing mechanism to endow the fiber with tunable structural color and excellent mechanical property, has strong process controllability and is green and environment-friendly, and the prepared structural color fiber has wide application prospect in the fields of intelligent sensing, flexible display, biomedical and the like.

Inventors

  • LIU JIDONG
  • TANG YIQI
  • DU XIANGYUN
  • LIU XINHUA

Assignees

  • 安徽工程大学

Dates

Publication Date
20260512
Application Date
20251218

Claims (10)

  1. 1. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber is characterized by comprising the following steps of: S1, dissolving a cellulose-based cholesteric liquid crystal polymer in a first solvent to obtain a nuclear layer liquid crystal phase solution, and dissolving a shell polymer or a polymer precursor solution in a second solvent to obtain a shell solution; S2, conveying the nuclear layer liquid crystal phase solution through an inner layer channel of the coaxial microfluidic chip, conveying the shell layer solution through an intermediate layer channel, conveying the sheath layer solution through an outer layer channel, and collecting in a coagulating bath to obtain the structural color fiber.
  2. 2. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 1, wherein the cellulose-based cholesteric liquid crystal polymer is one or more of hydroxypropyl cellulose, cellulose acetate, carbamoylethyl cellulose, ethyl cellulose, acetylethyl cellulose, acetoxypropyl cellulose, acetylhydroxypropyl cellulose, ethylcyanoethyl cellulose and cellulose nanocrystals; the first solvent is one or more of deionized water, ethanol, acetone, dimethyl sulfoxide, dimethylformamide and dimethylacetamide.
  3. 3. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 1, wherein the shell polymer is one or more of polyvinyl alcohol, polyacrylic acid, chitosan, sodium alginate, gelatin, silk fibroin and polyurethane; the second solvent is one or more of water, acetic acid, formic acid and glycerin.
  4. 4. The method for preparing the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 1, wherein the polymer precursor solution consists of a polymerization monomer, a cross-linking agent, an initiator and a third solvent.
  5. 5. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 4, wherein the polymerization monomer is one or more of acrylic acid, gelatin methacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, hexanediol diacrylate, hydroxybutyl acrylate, isopropyl acrylamide, glycidyl methacrylate and polyurethane oligomer; the mass fraction of the polymerized monomer in the polymer precursor solution is 40% -70%; The third solvent is one or more of water, acetic acid and formic acid.
  6. 6. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 4, wherein the cross-linking agent is one or more of ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, trimethylolpropane triacrylate and methylenebisacrylamide; The mass fraction of the cross-linking agent in the polymer precursor solution is 0-5%, and the addition amount of the cross-linking agent is not 0.
  7. 7. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 4, wherein the initiator is one or more of 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide, 2-hydroxy-2-methyl-1-phenylpropion and 2-hydroxy-4' - (2-hydroxyethoxy) -2-methylpropionne; The mass fraction of the initiator in the polymer precursor solution is 0-5%, and the addition amount of the initiator is not 0.
  8. 8. The method for preparing the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 1, wherein the inner diameter ratio of the inner layer channel to the middle layer channel to the outer layer channel is 1:1.5-5:3-10; The flow rate ratio of the inner layer channel, the middle layer channel and the outer layer channel is 1:1-8:10-30.
  9. 9. The preparation method of the microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber according to claim 1, wherein the sheath solution is one or more of ethanol, methanol, water, alkane and metal ion solution; the metal ion is one or more of Ca 2+ 、Ba 2+ 、Sr 2+ 、Cu 2+ and Zn 2+ , and the concentration of the metal ion is 0.1-5%.
  10. 10. A microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber, characterized in that it is prepared by the preparation method according to any one of claims 1-9.

Description

Microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber and preparation method thereof Technical Field The invention relates to the technical field of structural color fibers, in particular to a microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber and a preparation method thereof. Background The structural color is generated by interaction of the microstructure periodic arrangement and light, is different from the traditional chemical dye coloring mode, and has the advantages of environmental protection, no fading, capability of responding to external stimulus and the like. The cellulose-based polymer is taken as a natural high molecular derivative, has excellent green reproducibility, biocompatibility and self-assembly performance, can spontaneously form a cholesteric liquid crystal structure at a specific concentration, and can selectively reflect visible light with a specific wavelength by periodic spiral arrangement to generate structural color. At present, preparation methods of structural color materials based on cellulose mainly comprise solution casting, electrostatic spinning and the like, but the methods have the problems of low assembly efficiency, low structural color strength, poor uniformity, narrow tunable range and the like. It is therefore a great challenge in this field to explore a solution for large-scale efficient assembly of structural color fibers. The micro-fluidic technology is an emerging method for precisely controlling micro-fluid by using a micro-channel, utilizes coaxial shearing, substance diffusion, energy exchange and chemical reaction to lead fluid flow behavior, can prepare nano-to-micron-sized fibers, has the advantages of high size uniformity, designable structure, high raw material utilization rate, easiness in integrating components and the like, is expected to realize continuous assembly and mass production of materials, and is widely applied to the fields of tissue engineering, photoelectric materials, intelligent fabrics, flexible sensing and the like. However, single-phase cellulose-based structural color fibers often have the problems of low mechanical properties, poor flexibility, easily damaged structural color and the like. Disclosure of Invention Based on the technical problems in the background art, the invention provides the micro-fluidic induced self-assembled core-shell structure cellulose-based structural color fiber and the preparation method thereof, and the prepared cellulose-based structural color fiber has the characteristics of bright and uniform structural color, high strength and good flexibility. The invention provides a preparation method of a microfluidic induced self-assembled core-shell structure cellulose-based structural color fiber, which comprises the following steps: S1, dissolving a cellulose-based cholesteric liquid crystal polymer in a first solvent to obtain a nuclear layer liquid crystal phase solution, and dissolving a shell polymer or a polymer precursor solution in a second solvent to obtain a shell solution; S2, conveying the nuclear layer liquid crystal phase solution through an inner layer channel of the coaxial microfluidic chip, conveying the shell layer solution through an intermediate layer channel, conveying the sheath layer solution through an outer layer channel, and collecting in a coagulating bath to obtain the structural color fiber. Preferably, the cellulose-based cholesteric liquid crystal polymer is one or more of hydroxypropyl cellulose, cellulose acetate, carbamoylethyl cellulose, ethyl cellulose, acetyl ethyl cellulose, acetoxypropyl cellulose, acetyl hydroxypropyl cellulose, ethyl cyanoethyl cellulose and cellulose nanocrystals. Preferably, the first solvent is one or more of deionized water, ethanol, acetone, dimethyl sulfoxide, dimethylformamide, dimethylacetamide and other polar solvents. Preferably, the shell polymer is one or more of polyvinyl alcohol, polyacrylic acid, chitosan, sodium alginate, gelatin, silk fibroin and polyurethane. Preferably, the second solvent is one or more of water, acetic acid, formic acid and glycerin. Preferably, the polymer precursor solution is composed of a polymerized monomer, a crosslinking agent, an initiator, and a third solvent. Preferably, the polymerization monomer is one or more of acrylic acid, gelatin methacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, hexanediol diacrylate, hydroxybutyl acrylate, isopropyl acrylamide, glycidyl methacrylate and polyurethane oligomer. Preferably, the third solvent is one or more of water, acetic acid and formic acid. Preferably, the cross-linking agent is one or more of ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, trimethylolpropane triacrylate and methylene bisacrylamide. Preferably, the mass fraction of the crosslinking agent in the polymer precursor solution is 0-5%, and the addition amount o