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Preparation method of 4D printing liquid crystal elastomer and application of 4D printing liquid crystal elastomer in actuator

A technology of liquid crystal elastomers and liquid crystal monomers, which is applied in the preparation of 4D printing liquid crystal elastomers based on water-based solvent curing, and in the application field of actuators. It can solve the problem of incomplete cross-linking and curing of materials and poor overall mechanical properties of materials. To effectively improve and enhance problems, to achieve the effect of improving mechanical properties and realizing mechanical properties

Active Publication Date: 2021-03-19
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as the printing progresses, the surface of the liquid crystal elastomer formed by photocuring also changes from transparent to milky white, making it difficult for light to pass through and cannot enter the interior of the material or the printed device, resulting in the incomplete crosslinking and curing of the material inside, so the material The overall mechanical properties cannot be effectively improved and enhanced

Method used

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  • Preparation method of 4D printing liquid crystal elastomer and application of 4D printing liquid crystal elastomer in actuator
  • Preparation method of 4D printing liquid crystal elastomer and application of 4D printing liquid crystal elastomer in actuator
  • Preparation method of 4D printing liquid crystal elastomer and application of 4D printing liquid crystal elastomer in actuator

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Embodiment 1

[0052] Using the preparation method of the present invention to prepare 4D printing liquid crystal elastomer material, the specific operation steps are as follows:

[0053] S1. Preparation of precursor ink: take liquid crystal monomer RM257, linker EDDET, and catalyst n-dipropylamine, dissolve them in a mixed solvent of tetrahydrofuran and dichloromethane and continue to react for 12 hours. After the reaction, add cross-linking agent PETMP and 30% The hydrogen oxide solution was stirred for 6 hours to obtain the printing precursor ink; the molar ratio of RM257, EDDET, and PETMP was 1:1.2:0.2; the catalyst n-dipropylamine accounted for 0.74% of the total liquid crystal monomer RM257.

[0054] S2. Preparation of a solvent bath: uniformly mix ethanol and 30% hydrogen peroxide solution at a volume ratio of 3:1, place in a 15cm×15cm container, and obtain a solvent bath for use;

[0055] S3.4D printing: inject the precursor ink prepared in S1 into the printing cylinder, place the so...

Embodiment 2

[0059] Using the preparation method of the present invention to prepare 4D printing liquid crystal elastomer material, the specific operation steps are as follows:

[0060] S1. Preparation of precursor ink: take liquid crystal monomer RM257, linker PDT, and catalyst triethylamine, dissolve in tetrahydrofuran solvent and continue to react for 12 h. After the reaction, add cross-linking agent PETMP and peracetic acid solution and stir for 6 h. The printing precursor ink can be obtained; the molar ratio of RM257, EDDET and PETMP is 1:1.1:0.1; the catalyst triethylamine accounts for 0.74% of the total liquid crystal monomer RM257.

[0061] S2. Preparation of a solvent bath: uniformly mix water and peracetic acid solution at a volume ratio of 2:1, and place them in a 15cm×15cm container to obtain a solvent bath for use;

[0062] S3.4D printing: inject the precursor ink prepared in S1 into the printing cylinder, place the solvent bath prepared in step S2 on the printing table, adjus...

Embodiment 3

[0066] Using the preparation method of the present invention to prepare 4D printing liquid crystal elastomer material, the specific operation steps are as follows:

[0067] S1. Prepare the precursor ink: take the liquid crystal monomer RM257, the linker GDMP, and the catalyst sodium ethoxide to dissolve in dichloromethane solvent and continue to react for 12 h. After the reaction, add the cross-linking agent PETMP and elemental iodine solution and stir for 6 h. The printing precursor ink can be obtained; the molar ratio of RM257, EDDET, and PETMP is 1:1.1:0.1; the catalyst sodium ethoxide accounts for 0.74% of the total liquid crystal monomer RM257.

[0068] S2. Prepare a solvent bath: uniformly mix ethanol, acetone and 30% hydrogen peroxide solution at a volume ratio of 4:1:1, and place them in a 15cm×15cm container to obtain a solvent bath for use;

[0069] S3.4D printing: inject the precursor ink prepared in S1 into the printing cylinder, place the solvent bath prepared in ...

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Abstract

The invention relates to a preparation method of a 4D printing liquid crystal elastomer and an application of the 4D printing liquid crystal elastomer in an actuator, a liquid crystal elastomer oligomer containing a dynamic disulfide bond is used as printing precursor liquid ink, a device of the 4D printing liquid crystal elastomer is realized by adopting aqueous solvent curing, and the 4D printing liquid crystal elastomer is applied in the actuator. Meanwhile, a freeze-drying technology is adopted, so that the shrinkage rate of the device is effectively improved, and the printing device can better maintain the overall morphological characteristics. The invention provides an effective rapid curing method for 4D printing material forming and structural design. Meanwhile, water-based solventcuring is systematically applied to the 4D printing material, the manufacturing and processing limitation of a traditional photocuring or photo-thermal curing 4D printing process method is broken through, and a new method is provided for deep curing of 4D printing of opaque materials.

Description

technical field [0001] The invention relates to a preparation method of a 4D printing liquid crystal elastomer, in particular to a preparation method based on aqueous solvent curing of a 4D printing liquid crystal elastomer and its application in an actuator. Background technique [0002] 4D printing technology is an emerging manufacturing technology that combines 3D printing technology with intelligent structures. Its fourth dimension has the same characteristics as sensing materials, that is, sensing external stimuli such as stress, strain, heat, light, electricity, magnetism, chemistry, and radiation. and respond accordingly. As a class of responsive smart materials, liquid crystal elastomers have potential applications in artificial muscles, soft robots, and dynamic reversible functional structures. [0003] A variety of material strategies have emerged to realize the deformable structures of 4D printed liquid crystal elastomers, and the printed polymers can be machined...

Claims

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Application Information

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IPC IPC(8): C09D11/30B33Y10/00B33Y70/00
CPCC09D11/30B33Y10/00B33Y70/00C09D11/03
Inventor 袁宁一江瑶瑶丁建宁董旭戴胜平许意达李绿洲
Owner CHANGZHOU UNIV
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