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Preparation method and application of nanocellulose polymer optical composite hydrogel

A nanocellulose and composite hydrogel technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of hard, brittle and easily damaged, sudden decrease in strength, uneven color dispersion, etc., and achieve low content and uniform color. Effect

Active Publication Date: 2021-05-28
广东省科学院生物与医学工程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-assembly time required for the preparation of nanocellulose color film is long, and the size polydispersity and defects in the self-assembly process will cause uneven color.
In addition, the required content of cellulose nanocrystals in the color film is high (generally higher than 50wt%), which is hard and brittle, and the hydrogen bonds between cellulose nanocrystals are destroyed in the water environment, and the strength will also drop sharply, so it is still necessary Development of new cellulose optical materials

Method used

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  • Preparation method and application of nanocellulose polymer optical composite hydrogel
  • Preparation method and application of nanocellulose polymer optical composite hydrogel
  • Preparation method and application of nanocellulose polymer optical composite hydrogel

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Experimental program
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Effect test

Embodiment 1

[0031] Configuration contains 2.0wt% nanocellulose, 2mol / L acrylamide, relative monomer content 0.2wt% initiator 2-hydroxyl-4-(2-hydroxyethoxy)-2-methyl propiophenone, relative monomer content 0.1wt% crosslinking agent N,N-methylenebisacrylamide, 5wt% lithium magnesium silicate solution, and mix well. Using a 340 μm inner diameter needle, 10 4 Pa / s extrusion pressure, 12mm / s needle moving speed, print 3 layers with 3D printer. The sample was placed in a UV light box for 10 minutes to initiate cross-linking polymerization, and unreacted monomers, initiators, and cross-linking agents were removed to obtain a nanocellulose / polyacrylamide composite hydrogel. The sample showed a uniform yellow color under crossed polarized light. Such as figure 1 shown.

Embodiment 2

[0033] Configuration contains 0.2wt% nanocellulose, 2mol / L acrylamide, relative monomer content 0.2wt% initiator 2-hydroxyl-4-(2-hydroxyethoxy)-2-methyl propiophenone, relative monomer content 0.1wt% crosslinking agent N,N-methylenebisacrylamide, 5wt% lithium magnesium silicate solution, and mix well. Using a 340 μm inner diameter needle, 10 4Pa / s extrusion pressure, 12mm / s needle moving speed, print 3 layers with 3D printer. The sample was placed in an ultraviolet light box for 10 minutes to initiate cross-linking polymerization, and unreacted monomers, initiators, and cross-linking agents were removed to obtain nanocellulose / polyacrylamide composite hydrogel. Under crossed polarized light, when the printing direction of the sample is 45° to the polarizing direction of the polarizer, the polarization intensity is the strongest and shows uniform white color; when the printing direction of the sample is rotated parallel to the polarization direction of the polarizing plate, th...

Embodiment 3

[0035] Configuration contains 4.0wt% nanocellulose, 2mol / L acrylamide, relative monomer content 0.2wt% initiator 2-hydroxyl-4-(2-hydroxyethoxy)-2-methylpropiophenone, relative monomer content 0.1wt% crosslinking agent N,N-methylenebisacrylamide, 5wt% lithium magnesium silicate solution, and mix well. Using a 340 μm inner diameter needle, 10 4 Pa / s extrusion pressure, 12mm / s needle moving speed, print 3 layers with 3D printer. Place the sample in a UV light box for 10 minutes to initiate cross-linking polymerization, remove unreacted monomers, initiators, and cross-linking agents, and obtain nanocellulose / polyacrylamide composite hydrogel. The sample shows a uniform orange-red color under crossed polarized light .

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Abstract

The invention discloses a preparation method and application of nanocellulose polymer optical composite hydrogel. Nanocellulose is arranged in a parallel orientation mode, the ordered arrangement structure of the nanocellulose is fixed by initiating macromolecule cross-linking, and the optical composite hydrogel which shows uniform interference color under an orthogonal polaroid is successfully prepared and the color of the optical composite hydrogel is fixed. The brightness difference or color difference is changed by changing the orientation direction of the nanocellulose, the concentration of the nanocellulose, the material thickness and other factors to form optical materials with different patterns, and the optical materials have the stimulation responsiveness of soft materials at the same time and have wide application prospects in the aspects of anti-counterfeiting, information storage, sensing and the like.

Description

Technical field: [0001] The invention relates to the technical fields of intelligent polymer materials and optical materials, in particular to a preparation method and application of a nano-cellulose polymer optical composite hydrogel. Background technique: [0002] The formation of color in nature is divided into pigment color and structural color according to the principle of color rendering. Pigment color is produced by pigment molecules through selective absorption, reflection and transmission of light, which belongs to chemical coloration. Structural color is produced by the special physical structure of the object itself and the diffraction, interference and scattering of light, which belongs to physical color. Since the structural color is not affected by the environment and will fade, it has obvious advantages over the pigmented color. The structural color of organisms in nature plays an important role in daily life activities such as communication, warning, and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F251/02C08F220/56C08F222/38C08F220/54C08F220/06G02F1/00C08L51/02C08L1/02C08L5/04
CPCC08J3/075C08F251/02G02F1/0009C08J2351/02C08J2301/02C08J2405/04C08J2305/04C08J2401/02C08F220/56C08F222/385C08F220/54C08F220/06
Inventor 程巧云陈晓初陈建津高裕峰余构彬
Owner 广东省科学院生物与医学工程研究所
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