Preparation method based on liquid crystal elastomer and 4D printing and product

A technology of liquid crystal elastomers and liquid crystal monomers, applied in liquid crystal materials, chemical instruments and methods, processing and manufacturing, etc., can solve the problems of single deformation and limited use of liquid crystal elastomers, and achieve superior performance, strong applicability, and efficiency. high effect

Inactive Publication Date: 2019-08-27
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a preparation method and product based on liquid crystal elastomer and 4D printing. Due to the problem of limited use, research and design a preparation method based on liquid crystal elastomer and 4D printing that can achieve multiple deformations

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  • Preparation method based on liquid crystal elastomer and 4D printing and product

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preparation example Construction

[0026] see figure 1 , the preparation method based on liquid crystal elastomer and 4D printing provided by the present invention, the preparation method mainly includes the following steps:

[0027] Step 1, mixing and stirring the liquid crystal monomer, the cross-linking agent n-butylamine and the photoinitiator to obtain an oligomer.

[0028] Specifically, after mixing the liquid crystal monomer and the crosslinking agent n-butylamine according to the molar ratio (1-1.5): 1, then add ( 1-2)% of the photoinitiator and then stirred at 80-110°C for 18h-24h to obtain oligomers.

[0029] In this embodiment, the liquid crystal monomer is liquid crystal monomer RM82, and the photoinitiator is Irgacure369; the oligomer is an opaque yellow viscoelastic material at room temperature.

[0030] In step 2, the oligomer is subjected to debubbling treatment to make the printing process smoother and to avoid quality defects of the printed product.

[0031] Specifically, the oligomer is lo...

Embodiment 1

[0039]The preparation method based on liquid crystal elastomer and 4D printing provided in Example 1 of the present invention mainly includes the following steps:

[0040] (1) Preparation of oligomer: Mix the liquid crystal monomer RM82 and the crosslinking agent n-butylamine in a round-bottomed flask at a molar ratio of 1:1, and add a mass equal to the liquid crystal to the round-bottomed flask. 1.5% photoinitiator Irgacure369 based on the mass sum of the monomer RM82 and the cross-linking agent n-butylamine was stirred in an oil bath at 110° C. for 18 hours to obtain an oligomer.

[0041] (2) Remove air bubbles: put the oligomer into the barrel of the 4D printing equipment, then put the barrel into a vacuum oven at a temperature of 80°C and a vacuum of 5×10 3 The drying time under Pa is 12h.

[0042] (3) Geometric modeling and printing rate programming design: use 3D modeling software to build a 3D model of the file to be formed and export the STL file, and use slicing soft...

Embodiment 2

[0045] The preparation method based on liquid crystal elastomer and 4D printing provided in Example 2 of the present invention mainly includes the following steps:

[0046] (1) Preparation of oligomer: Mix the liquid crystal monomer RM82 and the crosslinking agent n-butylamine in a round-bottomed flask with a molar ratio of 1.3:1, and add a mass of the liquid crystal to the round-bottomed flask. 2% photoinitiator Irgacure369 based on the mass sum of the monomer RM82 and the cross-linking agent n-butylamine was stirred in an oil bath at 80° C. for 22 hours to obtain an oligomer.

[0047] (2) Remove air bubbles: put the oligomer into the barrel of the 4D printing equipment, then put the barrel into a vacuum oven at a temperature of 100°C and a vacuum of 2×10 3 The drying time under Pa is 9h.

[0048] (3) Geometric modeling and printing rate programming design: use 3D modeling software to build a 3D model of the file to be formed and export the STL file, and use slicing software...

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Abstract

The invention belongs to the technical field of advanced material preparation and forming, and discloses a preparation method based on a liquid crystal elastomer and 4D printing and a product. The preparation method comprises the following steps of (1) mixing and stirring a liquid crystal monomer, a crosslinking agent n-butylamine and a photoinitiator to obtain an oligomer and carrying out bubbleremoval treatment on the oligomer; (2) constructing a three-dimensional model of a to-be-formed component, and adopting slicing software for carrying out printing rate programming design and slicing on the basis of the oligomer and the three-dimensional model to obtain a file which can be directly read and run by a 4D printing device; (3) taking the oligomer as a material, carrying out printing forming of the to-be-formed component through the 4D printing device according to the file, and using ultraviolet light for irradiating printed parts during printing. The method can realize the preparation of complex deformable liquid crystal elastomer components.

Description

technical field [0001] The invention belongs to the related technical field of advanced material preparation and forming, and more specifically relates to a preparation method and product based on liquid crystal elastomer and 4D printing. Background technique [0002] Liquid crystal elastomers are a class of smart materials that have only been developed in recent decades. When the temperature is higher or lower than its clearing point temperature, the internal liquid crystal elements will be rearranged, resulting in macroscopic deformation. Due to the characteristics of reversible deformation, large stimulus response and fast response rate, liquid crystal elastomers have gradually aroused people's interest. With the rise of 4D printing, liquid crystal elastomers soon showed great application prospects, such as soft robots, artificial muscles, and dynamic functional structures. [0003] At present, the forming of polymer materials mainly depends on mold forming. Although smo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F122/20C08F2/48C09K19/38B29C64/10B29C64/386B33Y10/00B33Y50/00B33Y70/00B33Y80/00
CPCB29C64/10B29C64/386B33Y10/00B33Y50/00B33Y70/00B33Y80/00C08F2/48C08F122/1006C09K19/3852
Inventor 宋波汤桂平史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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