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Stretchable blue-phase liquid crystal elastomer and preparation method thereof

A blue-phase liquid crystal and elastomer technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as limited mechanical stretchability, and achieve the effects of good mechanical ductility, uniform coloring, and high reflectivity

Pending Publication Date: 2022-03-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited mechanical stretchability (Δλ < 140 nm, less than 1.5 times the original length) is an urgent technical challenge for blue-phase liquid crystal elastomers

Method used

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  • Stretchable blue-phase liquid crystal elastomer and preparation method thereof
  • Stretchable blue-phase liquid crystal elastomer and preparation method thereof
  • Stretchable blue-phase liquid crystal elastomer and preparation method thereof

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preparation example Construction

[0082] According to the second aspect of the present invention, there is also provided a method for preparing a stretchable blue phase liquid crystal elastomer, comprising: adding 46 to 48 wt% of achiral small molecule liquid crystal, 38.1 wt% of acrylate photopolymerizable monomer Body, 2-4wt% chiral material, 0.3wt% photoinitiator, mix and heat to isotropy, stir evenly; after cooling to room temperature, add catalyst DPA and stir evenly; then add mercaptan crosslinking monomer EDDET and stir evenly, Obtain a liquid crystal precursor; heat the mixture to the clearing point of the liquid crystal, pour it into a liquid crystal cell with a thickness of 8-60 μm; cool down the temperature of the liquid crystal cell, and let the mixture reach a blue phase state and let it stand for 0-360 min , control the cooling speed within 0.01~10℃ / min; keep the blue phase state under the light intensity of 2mW / cm 2 The above ultraviolet light is irradiated for 10 seconds to 30 minutes, taken ou...

Embodiment 1

[0088] Achiral small-molecule liquid crystals and acrylic esters with mass proportions of 47.2%, 38.1%, 2.8%, and 0.3% (together with the subsequently added catalyst and cross-linking monomer to form a 100% mass) Photopolymerizable monomer C3M is mixed with RM105, chiral material R5011, and photoinitiator IRG184;

[0089] Heat the mixture to 140°C on a hot stage to fully dissolve the above mixture, stir magnetically for 30 minutes, and cool to room temperature to obtain a homogeneous mixture;

[0090] The catalyst DPA with a mass ratio of 0.15% was added to the above mixture, and magnetically stirred at room temperature for 10 minutes;

[0091] Add thiol-based cross-linking monomer EDDET with a mass ratio of 11.4% to the above mixture, and magnetically stir at room temperature for 10 minutes to obtain a liquid crystal precursor;

[0092] The liquid crystal precursor is heated to a clearing point of 35°C, and poured into a parallel-oriented liquid crystal cell with a thickness...

Embodiment 2

[0097] Achiral small-molecule liquid crystals and acrylic esters with mass proportions of 46.9%, 38.1%, 3.1%, and 0.3% (together with the base catalyst and crosslinking monomer added later to form a whole with a mass of 100%) Photopolymerizable monomer C3M is mixed with RM105, chiral material R5011, and photoinitiator IRG184;

[0098] Heat the mixture to 140°C on a hot stage to fully dissolve the above mixture, stir magnetically for 30 minutes, and cool to room temperature to obtain a homogeneous mixture;

[0099] The catalyst DPA with a mass ratio of 0.15% was added to the above mixture, and magnetically stirred at room temperature for 10 minutes;

[0100] Add thiol-based cross-linking monomer EDDET with a mass ratio of 11.4% to the above mixture, and magnetically stir at room temperature for 10 minutes to obtain a liquid crystal precursor;

[0101] Heat the liquid crystal precursor to the clearing point of 35°C, and pour it into a parallel-oriented liquid crystal cell with ...

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Abstract

The invention provides a stretchable blue-phase liquid crystal elastomer and a preparation method thereof. The stretchable blue-phase liquid crystal elastomer is prepared from the following raw materials: achiral micromolecular liquid crystal, a photopolymerizable monomer, a chiral material, a photoinitiator and a click reaction crosslinking monomer. In the preparation method, liquid crystal molecules can be induced to be self-assembled to construct a blue-phase liquid crystal structure in a click chemical reaction process. The blue-phase liquid crystal elastomer has a synergistic response to deformation and color change and has good mechanical ductility, and the mechanically reversible reflection color of the elastomer can be flexibly adjusted in almost the whole visible light wave band and can be stretched to two times or more of the original length.

Description

technical field [0001] The invention relates to the field of liquid crystal three-dimensional photonic crystals and elastomers, in particular to a stretchable blue-phase liquid crystal elastomer and a preparation method thereof. Background technique [0002] In the blue phase liquid crystal, the double-helical cylindrical structure formed by the liquid crystal molecules under the action of the high chiral agent spontaneously forms a three-dimensional lattice structure in the form of spatial topology under the interaction between the molecules, but there is a gap between the cylinders and the cylinders. defect. Due to the existence of defect structures, the blue phase liquid crystal constitutes an unstable region with high free energy in the system. Thermal stability used to be a technical challenge for blue phases, until the introduction of polymer networks by in situ photopolymerization of mono- and diacrylate reactive mesogens to stabilize defect structures, and is known ...

Claims

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Application Information

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IPC IPC(8): C09K19/38C09K19/44C09K19/46C08F2/48C08F220/30C08F222/10
CPCC09K19/44C09K19/46C09K19/3852C08F222/102C08F220/302C08F2/48
Inventor 朱吉亮郑琳许雪敬孙冬鹏周璇
Owner HEBEI UNIV OF TECH
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