Light response liquid crystal elastomer fiber membrane and preparation method thereof

A technology of liquid crystal elastomer and photoresponse, which is applied in fiber processing, liquid crystal materials, chemical instruments and methods, etc. It can solve problems such as difficulty in orientation of liquid crystal polymers, long time, and difficulty in preparing multi-layer films.

Active Publication Date: 2020-05-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although photoresponsive liquid crystal polymers have very good performance in terms of photoexcitation, they have not overcome the defects of liquid crystal polymers such as difficult orientation, long time, and incomplete orientation of trad

Method used

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  • Light response liquid crystal elastomer fiber membrane and preparation method thereof
  • Light response liquid crystal elastomer fiber membrane and preparation method thereof
  • Light response liquid crystal elastomer fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Polymerization and purification were carried out according to the free radical polymerization method commonly used in the literature. The structural formula and monomer structure of the synthesized polymer are shown below, named P6AZCN 1 -co-M4OH 1 .

[0048]

[0049] Put 2 g of the prepared copolymer in a 25 ml single-necked flask, add 8 g of N,N'-dimethylformamide at 60°C, and stir for 12 hours to prepare a spinning solution. The concentration of the spinning solution was 20 wt%, and the spinning solution was transferred to a 10 mL syringe, and defoamed overnight at 4°C.

[0050] Spinning is carried out by using an electrostatic spinning machine with a receiving roller, and the temperature inside the spinning machine is controlled below 20° C., and the humidity is below 20% rh. The propulsion speed is 0.004ml / min, the receiving distance is 10cm, the voltage is 10kV, and the rotating speed of the receiving roll is 500r / min fixed axis spinning for 4h to obtain a f...

Embodiment 2

[0052] Polymer using P6AZ 2 -co-M4OH 1 , the molecular formula and monomer structure are shown in the figure, m:n=2:1.

[0053]

[0054]Mix with dimethylformamide solution of 8wt% polyamic acid to prepare a solution containing 5wt% photoresponsive liquid crystal polymer (the mass ratio of non-azo polymer to azo liquid crystal polymer is 95:5), spin The concentration of silk liquid is 30wt%. Transfer the solution to a 10 mL syringe and defoam overnight at 4 °C.

[0055] Spinning is carried out by using an electrostatic spinning machine with a receiving roller, and the temperature inside the spinning machine is controlled below 20° C., and the humidity is below 20% rh. The propulsion speed is 0.004ml / min, the receiving distance is 10cm, the voltage is 10kV, and the receiving roll speed is 1000r / min fixed axis spinning for 4h to obtain a fiber film with a thickness of 20μm. The cross-linked fiber membrane was obtained by immersing in medium overnight, and the properties ar...

Embodiment 3

[0057] Polymer using P6AZC4 2 -co-M4OH 1 , the molecular formula is as follows.

[0058]

[0059] Mix with 10wt% polyurethane elastomer solution [solvent is dimethylformamide] to prepare a solution containing 10wt% photoresponsive liquid crystal polymer composite material, the mass ratio of non-azo polymer to azo liquid crystal polymer is 90:10 . The concentration of the spinning solution was 30 wt%, and the solution was transferred to a 10 mL syringe and defoamed overnight at 4°C.

[0060] Spinning is carried out by using an electrostatic spinning machine with a receiving roller, and the temperature inside the spinning machine is controlled below 20° C., and the humidity is below 20% rh. The propulsion speed is 0.004ml / min, the receiving distance is 10cm, the voltage is 10kV, and the receiving roll speed is 1000r / min fixed axis spinning for 4h to obtain a fiber film with a thickness of 20μm. The cross-linked fiber membrane was obtained by immersing in medium overnight,...

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Abstract

The invention discloses a light response liquid crystal elastomer fiber membrane and a preparation method thereof. The fiber membrane is prepared by adopting a cross-linkable light response liquid crystal polymer or mixing the cross-linkable light response liquid crystal polymer and a high polymer material, performing high-voltage electrostatic spinning, and adding a cross-linking agent for reaction, wherein the diameter of the fiber is 10 nm-100 [mu]m, and the thickness of the fiber membrane is 100 nm-1 mm. According to the method, the fiber membrane of a side chain type light response liquidcrystal polymer is prepared by electrostatic spinning, so that the liquid crystal polymer is subjected to dual orientation of an electric field and a force field simultaneously under a high pressurefield, and the orientation of liquid crystal units in each fiber can be greatly improved. Meanwhile, the preparation of the overall high-orientation fiber membrane is easily realized by controlling the spinning condition and changing a receiver.

Description

technical field [0001] The invention relates to the technical field of liquid crystal polymer materials, in particular to a light-responsive liquid crystal elastic fiber film and a preparation method thereof. Background technique [0002] With the increasing application of liquid crystal polymers in information technology, artificial intelligence, robotics and software bionics, it has received increasing attention. Among them, the liquid crystal elastomer material is a rising star in the past 10 years. [0003] When we define the nature of the excitation as light excitation, the photoresponsive liquid crystal elastomer material is the most excellent form of realization. Taking azobenzene as an example, its molecular formula is that two benzene rings are connected by an azo bond. As a representative substance of azoaromatic molecules, the absorption spectrum of azobenzene can be moved by changing the substituent groups on the benzene rings. Move from ultraviolet light to vi...

Claims

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Application Information

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IPC IPC(8): D04H1/728D01D5/00C09K19/38C08F220/34C08F220/40C08F220/38C08F222/02C08F220/20D06M13/395D06M13/192
CPCC08F220/20C08F220/34C08F220/38C08F220/40C08F222/02C09K19/3852C09K19/3861D01D5/003D01D5/0076D01D5/0092D04H1/728D06M13/192D06M13/395
Inventor 宋天夫张立群于海峰雷环宇
Owner BEIJING UNIV OF CHEM TECH
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