Method for preparing electrochromic fibers without external electrodes by coaxial microfluidic spinning method

An electrochromic and liquid crystal fiber technology, which is applied in the fields of fine chemicals and material science, can solve the problems that cannot meet the requirements of breathable and flexible textiles, cannot get rid of the application restrictions of external electrodes, and liquid crystal staining, so as to meet the needs of individualization and diversity. Requirements, controllable optical appearance, effect of uniform interference color

Active Publication Date: 2021-11-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are not suitable for the preparation of electrochromic liquid crystal fibers, because liquid crystals are easily doped in the polymer matrix during the preparation of microcapsules, resulting in staining, and the microcapsule coating method still cannot get rid of the application of external electrodes. Restricted, cannot meet the wearing requirements of textiles breathable and flexible

Method used

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  • Method for preparing electrochromic fibers without external electrodes by coaxial microfluidic spinning method
  • Method for preparing electrochromic fibers without external electrodes by coaxial microfluidic spinning method
  • Method for preparing electrochromic fibers without external electrodes by coaxial microfluidic spinning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for preparing electrochromic liquid crystal fibers by a coaxial microfluid spinning method, comprising the following steps:

[0054] (1) Preparation of transparent conductive outer layer injection 1: Disperse 0.05g sodium alginate powder, 0.5g glucose powder, 1.5g silver nanowires (length, diameter: 10 μm, 60 nm) (Sigma company) in 10 mL of water with magnetic stirring 10min, to prepare a uniform injection 1, wherein the mass fraction of silver nanowires relative to water is 0.15wt%;

[0055] (2) Preparation of black conductive inner layer injection 2: 0.05g sodium alginate powder, 0.5g glucose powder, 0.15g poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) ( Sinopharm Shanghai Test Co., Ltd.) was dispersed in 10 mL of water with magnetic stirring for 10 min to prepare a uniform injection 2, in which the mass fraction of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) relative to water was 0.015wt%;

[0056] (3) Preparation of electrochr...

Embodiment 2

[0062] The 90wt% red cholesteric liquid crystal in injection 3 of Example 1 was adjusted to 80wt% blue cholesteric liquid crystal (U10-006G-480, Shijiazhuang Chengzhi Yonghua Company), metal nanowires in injection 1 Copper nanowires were used, wherein the mass fraction of copper nanowires was 0.3 wt %; other electrochromic liquid crystal microfibers were prepared according to the same preparation steps in Example 1.

[0063] The electrochromic liquid crystal fibers prepared above were tested for optoelectronic properties (see Table 1) and water and solvent resistance properties (see Table 2). It can be seen from the test results that: with the electrochromic liquid crystal fiber obtained in Comparative Example 1, as the concentration of cholesteric liquid crystal decreases, the thickness of the liquid crystal layer also becomes thinner, and the required electrochromic driving voltage also increases. .

Embodiment 3

[0065] The 90wt% red cholesteric liquid crystal in injection 3 of Example 1 was adjusted to 70wt% yellow cholesteric liquid crystal (U10-006G-580, Shijiazhuang Chengzhi Yonghua Co., Ltd.), and the others were prepared in the same manner as in Example 1. The steps are to prepare electrochromic liquid crystal microfibers.

[0066] The photoelectric performance test (see Table 1) and the water and solvent resistance performance test (see Table 2) were carried out on the electrochromic liquid crystal fibers prepared above. It can be seen from the test results that: with the electrochromic liquid crystal fiber obtained in Comparative Example 1, as the concentration of cholesteric liquid crystal continues to decrease, the thickness of the liquid crystal layer continues to become thinner, and the required electrochromic driving voltage also continues to increase.

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Abstract

The invention discloses a coaxial microfluid spinning method for preparing electrochromic fibers without external electrodes, and belongs to the technical fields of fine chemical industry and material science. The invention adopts the coaxial micro-flow spinning method to prepare the electrochromic liquid crystal fiber with the black conductive polymer as the inner conductive layer, the transparent metal nanowire layer as the outer conductive layer, and the polymer dispersed cholesteric liquid crystal as the electrochromic layer , wherein the mass ratio of the metal nanowire layer, the black conductive layer, and the cholesteric liquid crystal layer is 5-30:100:5-30. The electrochromic liquid crystal fiber prepared by the method of the present invention can change color reversibly under electric field stimulation, and can realize a continuous and stable state of a certain discoloration state under the condition of power failure, not only the color is bright and changeable, but also the driving voltage is low and low. It is lower than 23.9V (lower than the human body safety voltage of 36V), and has good solvent resistance and water resistance.

Description

technical field [0001] The invention relates to a method for preparing electrochromic fibers without external electrodes by coaxial microfluid spinning, and belongs to the technical fields of fine chemical industry and material science. Background technique [0002] The ever-increasing demand for technology and individualization has become a new challenge and new trend for the development of the textile and garment industry. Smart textiles refer to a new class of textiles that are based on the basic materials and technical characteristics of textiles, simulate life systems, and have dual functions of perception and reflection. It not only has the performance of general fabrics, but also can intelligently sense changes in external conditions, and then process information through its own perception, issue instructions and execute actions. Among them, electrochromic materials can change the optical properties of textiles (reflectivity, transmittance, absorption rate, etc.) und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/18D01F1/09D01F1/10D01D5/34D01D5/06C09K9/02
CPCC09K9/02C09K2211/1011C09K2211/1088C09K2211/145D01D5/06D01D5/34D01F1/09D01F1/10D01F8/18
Inventor 付少海张丽平盛明非
Owner JIANGNAN UNIV
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