Repairable and multi-response deformable liquid crystal elastomer film as well as preparation method and application thereof
A liquid crystal elastomer and film technology, applied in the direction of coating, etc., can solve the problems of complicated process steps, long time required, difficult to repair covalent bonds, etc., and achieve the effect of simple process, avoiding complicated steps, and excellent properties.
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Embodiment 1
[0028] Embodiment 1: the synthesis of four-arm liquid crystal block copolymer
[0029] This example provides four-arm-poly(ethylene glycol)-block-poly{11-[4-(4-succinimidyl phenylazo)phenoxy]undecyl methacrylate }With the synthesis of active ester reactive terminal azobenzene block copolymer, the specific implementation steps are:
[0030]Add 0.5 g of four-arm polyethylene glycol macroinitiator (molecular weight 5000 g / mol) in the polymerization tube, monomer 11-[4-(4-succinimidyl ester phenylazo) phenoxy] undecane Base methacrylate 1.73g, catalyst cuprous chloride 38.8mg, ligand tris(2-dimethylaminoethyl)amine 320.4μL, solvent chlorobenzene 8mL, magnetic stirring rotor, and then carry out a series of deoxygenation operations ( Freeze in liquid nitrogen-vacuumize-thaw under the protection of high-purity nitrogen, repeat the cycle three times), and seal under vacuum. Put the reaction device in an oil bath at 90°C. After 20 hours of reaction, take it out, quench it in liquid ni...
Embodiment 2
[0031] Example 2: Preparation and Characterization of Repairable Multi-Response Deformable Liquid Crystal Elastomer Films
[0032] This embodiment is a star-shaped azobenzene block copolymer with active ester reactive end, four-arm-poly(ethylene glycol)-block-poly{11-[4-(4-succinimide ester phenylazo)phenoxy]undecyl methacrylate}, cross-linked with polyethyleneimine (PEI) rich in active amino groups, using the response of azophenyl group to ultraviolet light and polyethyleneimine Amine Response to Humidity to Fabricate Healable, Multi-Responsive Deformable Liquid Crystal Elastomer Films. Specifically include the following steps:
[0033] (1) Preparation of cross-linked liquid crystal film:
[0034] After the PTFE plate was cut into 15×15mm slices, ultrasonically cleaned with ethanol for 30 minutes; DMF solution of 40 mg / mL of block copolymer was prepared, and 1 mL was taken; DMF of 20 mg / mL of polyethyleneimine (molecular weight 70 k g / mol) was prepared Solution, add 20% gl...
Embodiment 3
[0041] Example 3 Application of Liquid Crystal Elastomer Film in Intelligent Switch
[0042] In this embodiment, polyethyleneimine (PEI) is used for its excellent complexing ability to metal ions, and the film is compounded with silver nanowires (AgNWs) to prepare a conductive deformable film, which is applied in the field of deformable smart switches.
[0043] (1) Preparation of conductive liquid crystal elastomer film:
[0044] Disperse the silver nanowires in ethanol at a concentration of 3 mg / mL, and oscillate with a shaker for 20 minutes to disperse evenly. Take 100 μL of silver nanowire ethanol dispersion, drop evenly on the surface of the film provided in Example 2, spin coat with a coater, spin coat at a speed of 2000 rpm, spin coat for 30 seconds, spin coat once and wait for the liquid on the film surface to volatilize , and spin coating for the second time to obtain a conductive silver nanowire composite liquid crystal elastomer film with a film resistance of about ...
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Abstract
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