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Liquid crystal elastic body or fiber with bidirectional shape memory effect and preparation method thereof

A technology of liquid crystal elastomer and memory effect, applied in liquid crystal materials, chemical characteristics of fibers, chemical instruments and methods, etc., can solve the problems of small deformation of photoinduced two-way shape memory polymers, temperature stimulation, and influence on application promotion.

Inactive Publication Date: 2009-10-21
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deformation of photoinduced two-way shape memory polymer is small, and the temperature stimulation is limited, which greatly affects its application and promotion.

Method used

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  • Liquid crystal elastic body or fiber with bidirectional shape memory effect and preparation method thereof
  • Liquid crystal elastic body or fiber with bidirectional shape memory effect and preparation method thereof
  • Liquid crystal elastic body or fiber with bidirectional shape memory effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] raw material:

[0046] 1) Liquid crystal monomer M1 ( 1 H-NMR (CDCl3), δ: 8.11 (4H, CH), 7.37-7.59 (3H CH), 7.14 (4H, CH), 5.59-6.27 (3H, CH=CH2), 5.16 (2H, OCH2), 4.06 (4H, OCH2), 1.76(4H, CH2), 1.45(4H, CH2), 0.9(6H, CH3)), for the synthesis method see: Mi Qiding, Wan Xinhua and Zhou Qifeng, Chemical Journal of Chinese Universities, 5, 822( 2000)), whose structure is:

[0047]

[0048] 2) Crosslinkable monomer: hydroxybutyl acrylate (HBA);

[0049] 3) Crosslinking agent: hexamethylene diisocyanate (HDI).

[0050] Preparation:

[0051]

[0052] First synthesize the liquid crystal monomer M1 according to the liquid crystal monomer preparation method recorded in the literature, the DSC curve of the temperature rise and the temperature drop of the gained liquid crystal monomer M1 is as follows figure 1 shown. It can be seen from the figure that on the heating curve, a glass transition occurs at Tg=88.8°C, and then enters the liquid crystal phase, and enters th...

Embodiment 2

[0055] raw material:

[0056] (a) liquid crystal monomer M2 ( 1 H-NMR (CDCl3) δ: 8.30-7.97 (3H CH), 7.26 (4H, CH), 7.06 (4H, CH), 5.59-6.27 (3H, CH=CH2), 4.06 (4H, CH2), 1.76 ( 4H, CH2), 1.45(4H, CH2), 0.9(6H, CH3)), its structure is as follows, the synthesis method can be found in the literature: Mi Qiding, Wan Xinhua and Zhou Qifeng, Chemical Journal of Chinese Universities, 5, 822 (2000).

[0057]

[0058] (b) near liquid crystal comonomer M3 ( 1 H-NMR (CDCl3) δ: 7.41-7.19 (3H CH), 6.27-5.59 (3H, CH=CH2), 5.16 (2H, OCH2), 2.27 (2H, CH), 1.79-1.47 (20H, CH2)) , its structure is as follows, and the synthesis method is referred to: D. Zhang, Y. Liu, X. Wan, Q. F. Zhou, Macromolecular, 32, 4494 (1999).

[0059]

[0060] (c) Cross-linkable monomer: hydroxyethyl acrylate (HEA)

[0061] (d) Crosslinking agent: diphenylmethane diisocyanate (MDI)

[0062] Preparation:

[0063]

[0064] First, the liquid crystal monomers M2 and M3 were synthesized according to the liqu...

Embodiment 3

[0068] raw material:

[0069] (a) liquid crystal monomer M4 ( 1 H-NMR (CDCl3) δ: 7.35-8.09 (3H CH), 7.79 (4H, CH), 7.19 (4H, CH), 5.59-6.27 (3H, CH=CH2), 4.09 (4H, OCH2), 4.06 ( 2H, OCH2), 3.97 (2H, OCH2), 1.89-1.62 (4H, CH2), 1.32 (6H, CH3)), preparation method reference. M.H.Liet al., Adv.Mater., 2003, 15 (7- 8), 569-572. Its structure is as follows:

[0070]

[0071] (b) Cross-linkable monomer: hydroxybutyl acrylate (HPA)

[0072] (c) Crosslinking agent: diphenylmethane diisocyanate (MDI)

[0073] Preparation:

[0074]

[0075] First, the liquid crystal monomer M4 was synthesized according to the preparation method of the liquid crystal monomer provided in the literature. Then adopt atomic free radical polymerization method (concrete method is referred to literature.M.H, Li, et al, Adv.Mater.2004,16(27),1922-1925), with dibromobutyl adipate / CuBr2, CuBr / The ternary initiation system of bpy, the polymerization reaction is initiated at 80 ℃ for 24 hours to obtain...

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Abstract

The invention discloses a liquid crystal elastic body and fiber with bidirectional shape memory effect and a preparation method thereof. The liquid crystal elastic body or a fiber molecular structure is a mixed body of one or two polymers in two general formula polymers disclosed as right. The liquid crystal polymer is mainly made of a waist connecting type liquid crystal monomer and a crosslinkable monomer. The preparation method of the liquid crystal elastic body or fiber comprises the steps: firstly, the waist connecting type liquid crystal monomer, the smectic liquid crystal monomer and the crosslinkable monomer carry out polyreaction to obtain the liquid crystal polymer, and then, the liquid crystal polymer is heated to be in a liquid crystal phase state; and under the action of an outfield, the liquid crystal matrixes of the liquid crystal polymer are sequentially arrayed and then the crosslinking treatment is carried out to obtain the liquid crystal elastic body or prepare the liquid crystal fiber. The obtained liquid crystal elastic body or fiber has the advantages of large bidirectional distortion, sensitive response for temperature stimulation, low deformation response temperature and easy regulation. The preparation method has simple technology and wide application prospect.

Description

technical field [0001] The invention belongs to the field of new functional materials and intelligent materials, and relates to a novel liquid crystal elastomer or fiber and a preparation method thereof, in particular to a liquid crystal elastomer and fiber with two-way shape memory effect and a preparation method thereof. Background technique [0002] Shape memory material is a smart material that can memorize macroscopic shapes, that is, it can fix a temporary shape under certain external conditions; it can return to its original original shape when it is exposed to temperature, electric field or other environmental stimuli. It has some singular properties, such as shape memory effect, pseudoelasticity, high damping, etc.; it has great scientific significance and important engineering significance, and is one of the research hotspots of new materials. Shape memory materials that have been widely studied are shape memory alloys, shape memory ceramics, and shape memory polym...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L33/14C08K5/29C08F287/00C08L83/06D01F6/00C09K19/38C09K19/40
Inventor 胡金莲陈少军
Owner THE HONG KONG POLYTECHNIC UNIV
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