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Full-spectrum selective reflection and photoluminescence Janus oligomer and preparation method thereof

A selective reflection and photoluminescence technology, applied in the field of optical materials, can solve the problems of no Janus oligomer, small difference in sensing color, duplication, etc., and achieve the effect of short preparation route, improved safety, and mild reaction conditions

Active Publication Date: 2020-12-29
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned color anti-counterfeiting based on chiral liquid crystals is a single-mechanism anti-counterfeiting, and the difference in the sensing color used for anti-counterfeiting is small, and there is still a risk of being copied by counterfeiters. Anti-counterfeiting technology with high security and complexity is an urgent need in the field of anti-counterfeiting
There is no literature or research report on the use of Janus oligomers as anti-counterfeiting materials

Method used

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  • Full-spectrum selective reflection and photoluminescence Janus oligomer and preparation method thereof
  • Full-spectrum selective reflection and photoluminescence Janus oligomer and preparation method thereof
  • Full-spectrum selective reflection and photoluminescence Janus oligomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A Janus oligomer with full-spectrum selective reflection and photoluminescence, its structural formula is as follows:

[0050]

[0051] The preparation method is as follows:

[0052] (1) Raw materials: undecylenyl chloride, pyrenemethanol, triethylamine, methanol, ethanol, tetrahydrofuran, chiral liquid crystal monomers containing double bonds and chiral mesogens 1: 4-allyloxybenzoic acid bile Sterol ester (prepared according to the technical scheme disclosed in CN109021981A), liquid crystal monomer 2 containing double bonds and rod-shaped mesogens: 3,4-difluorophenylbicyclohexylbutene, polymethylhydrosiloxane ( PMHS): the number of active hydrogen is about 4, catalyst: hexachloroplatinic acid.

[0053] (2) Preparation of luminescent monomer 3 containing double bonds:

[0054] Weigh pyrenemethanol (1.5g, 6.46mmol) and dissolve it in 15mL tetrahydrofuran, transfer this solution into a 100mL single-necked flask, add a small amount of triethylamine as an acid absorbin...

Embodiment 2

[0065] A Janus oligomer with full-spectrum selective reflection and photoluminescence, its structural formula is as follows:

[0066]

[0067] The preparation method is as follows:

[0068] (1) Raw materials: undecylenyl chloride, pyrenemethanol, triethylamine, methanol, ethanol, tetrahydrofuran, chiral liquid crystal monomers containing double bonds and chiral mesogens 1: 4-allyloxybenzoic acid bile Sterol esters (prepared according to the technical scheme disclosed in CN109021981A), liquid crystal monomers containing double bonds and rod-shaped mesogens 2: 4-methylphenylbicyclohexylbutene, polymethylhydrogensiloxane (PMHS) : The number of active hydrogen is about 4, catalyst: hexachloroplatinic acid.

[0069] (2) Preparation of luminescent monomer 3 containing double bonds:

[0070] Weigh pyrenemethanol (1.5g, 6.46mmol) and dissolve it in 15mL tetrahydrofuran, transfer this solution into a 100mL single-necked flask, add a small amount of triethylamine as an acid absorbi...

Embodiment 3

[0075] A Janus oligomer with full-spectrum selective reflection and photoluminescence, its structural formula is as follows:

[0076]

[0077] The preparation method is as follows:

[0078] (1) Raw materials: methanol, ethanol, tetrahydrofuran, chiral liquid crystal monomer 1 containing double bonds and chiral mesogens: cholesteryl 4-allyloxybenzoate (prepared according to the technical scheme disclosed in CN109021981A) , liquid crystal monomer containing double bond and rod-like mesogen 2: 3,4-difluorophenylbicyclohexylbutene, light-emitting monomer containing double bond and rigid benzene ring 3: undecyloxytriphenylene , Polymethylhydrogensiloxane (PMHS): the number of active hydrogen is about 4, catalyst: hexachloroplatinic acid.

[0079] (2) Preparation of full-spectrum selective reflection and photoluminescence Janus oligomers:

[0080]Chiral liquid crystal monomer 1 (0.1094g, 0.2mmol), nematic rod liquid crystal monomer 2 (0.2859g, 0.86mmol), light-emitting monomer ...

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Abstract

The invention discloses a full-spectrum selective reflection and photoluminescence Janus oligomer and a preparation method thereof, wherein the full-spectrum selective reflection and photoluminescenceJanus oligomer is constructed by graft copolymerization of a chiral liquid crystal monomer, a nematic liquid crystal monomer, fluorescent molecules and polymethyl hydrogen-containing siloxane, and the structure is shown as a formula I in the specification. According to the invention, the Janus oligomer can realize full-spectrum selective reflection in heating and cooling processes, and has high reversibility and accuracy; under the excitation of ultraviolet light, the Janus oligomer can emit fluorescence, wherein when the temperature rises to the thermal decomposition temperature of the Janusoligomer from the room temperature, the fluorescence intensity is monotonically reduced, and the fluorescence intensity still has high reversibility along with the change of the temperature; and theJanus oligomer prepared by the method has dual characteristics of dynamic reversible full-spectrum selective reflection and photoluminescence, has a wide application prospect in the anti-counterfeiting field, and is short in preparation route, safe and simple to operate and mild in reaction condition.

Description

technical field [0001] The invention relates to a Janus oligomer with full-spectrum selective reflection and photoluminescence and a preparation method thereof, belonging to the technical field of optical materials. Background technique [0002] Counterfeiting has become a global problem, many counterfeit products exist in electronic components in all consumer goods, medical products and even military applications, greatly affecting our daily life and economic development. Anti-counterfeiting technology has been widely used in banknotes, diplomas, certificates, jewelry, pharmaceuticals and electronic products. [0003] The structure of chiral nematic liquid crystal is tunable. By changing the helical pitch and refractive index of chiral nematic liquid crystal, the color of chiral nematic liquid crystal will change under different conditions, which makes it have great potential in the field of induction anti-counterfeiting. The application value, such as solvent-sensing colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/08C09K11/06
CPCC07F7/0838C07F7/0889C07F7/0878C09K11/06C09K2211/1011C09K2211/1007C07J51/00C09K19/408C09K19/406C09K2019/301C09K19/3833C09K19/32C09K19/36C09K11/59C09K2019/124
Inventor 么冰林鹏程祝恒恒罗丛丛王士凡丁跃徐艳堵锡华陈艳
Owner XUZHOU UNIV OF TECH
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