Fluorescent conjugated polymer, preparation method and application in development of grease fingerprints and blood fingerprints

A technology of conjugated polymers and polymers, which is applied in the field of fluorescent polymer materials, can solve problems such as research and application that have not been reported, and achieve the effects of clear fingerprint lines, low toxicity, and non-volatile effects

Active Publication Date: 2021-07-09
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the previous research on the application of conjugated polymers in the field of fingerprint visualization only involves the visualization of grease fingerprints or blood fingerprints, and there is no report on the research and application of materials that can be used for both fingerprint visualization

Method used

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  • Fluorescent conjugated polymer, preparation method and application in development of grease fingerprints and blood fingerprints
  • Fluorescent conjugated polymer, preparation method and application in development of grease fingerprints and blood fingerprints
  • Fluorescent conjugated polymer, preparation method and application in development of grease fingerprints and blood fingerprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a cationic polyphenylene acetylene thienylene fluorescent conjugated polymer.

[0048] See attached figure 1 , is a preparation roadmap of a cationic polyphenyleneethynylenethienylene fluorescent conjugated polymer provided in this example; the precursor polymer (denoted as PPETE -Br), and then undergo a substitution reaction to obtain a cationic polyphenylene acetylene thienylene fluorescent conjugated polymer.

[0049] In this embodiment, the structure of monomer M1 is:

[0050] ,

[0051] The preparation process of M1 is as follows:

[0052] Dissolve 3-thiophenemethanol (2.63 g, 23.1 mmol) in tetrahydrofuran (60.0 mL). N-Bromosuccinimide (8.53 g, 47.9 mmol) was added in four portions. The reaction was quenched after stirring the mixture in the dark at room temperature for 24 hours. An appropriate amount of diethyl ether was added to the mixture, and after washing three times with 1 M sodium hydroxide and deionized water, the organic ...

Embodiment 2

[0063] This example provides a cationic polyphenyleneethynylenethienylene fluorescent conjugated polymer PPETE-NMe 3 + The preparation of fingerprint revealing liquid, concrete steps are as follows:

[0064] Weigh 10 mg of the PPETE-NMe prepared in Example 1 3 + , add 10 mL N, N-dimethylformamide to dissolve the polymer with a pipette gun to prepare a 1 mg / mL polymer mother solution, dilute 10 times with N, N-dimethylformamide before use, and PPETE- NMe 3 + Prepare a 0.1 mg / mL N, N-dimethylformamide solution, namely the developing solution.

[0065] The developing solution has good photostability, see attached Figure 5 , the developing solution was continuously irradiated with 365 nm ultraviolet light for 20 minutes to measure the fluorescence spectrum every 1 minute, and the fluorescence emission intensity at 490 nm was plotted. It can be seen that within 20 minutes, the fluorescence intensity of the developing solution at 490 nm has almost no change, indicating that ...

Embodiment 3

[0067] This example provides a method for developing grease fingerprints for aluminum foil objects, using the cationic polyphenyleneethynylenethienylene fluorescent conjugated polymer PPETE-NMe prepared in Example 2 3 + The fingerprint revealing liquid is used to reveal grease fingerprints and obtain fingerprint pictures under ultraviolet light. The specific steps are as follows:

[0068] (1) Leave the fingerprint to be revealed at room temperature for 24 hours;

[0069] (2) Carefully drop 100 μL of the visualization solution on the object, incubate the visualization solution with the fingerprint for 60 s, absorb the excess visualization solution, and let it dry naturally;

[0070] (3) Observe bright and clear yellow-green fingerprint lines under the excitation of a multi-band light source (wavelength 365nm), and take pictures and record them with a camera.

[0071] See attached Figure 6 , which is the cationic polyphenylene ethynylene thienylene fluorescent conjugated pol...

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Abstract

The invention relates to a fluorescent conjugated polymer, a preparation method and an application of the fluorescent conjugated polymer in development of grease fingerprints and blood fingerprints. The preparation method comprises the following steps: synthesizing a cationic polyphenyleneethynylene thienyl fluorescent conjugated polymer through a Sonogashira coupling reaction and a subsequent substitution reaction, and dissolving the cationic polyphenyleneethynylene thienyl fluorescent conjugated polymer in a solvent to obtain the fingerprint developing liquid. The fingerprint developing liquid provided by the invention is effective for grease fingerprints and blood fingerprints, after a proper amount of developing liquid is dropwise added to an object and incubated together with the fingerprints for a period of time, and redundant developing liquid is absorbed and naturally aired, the bright fingerprint streaklines can be observed under 365 nm ultraviolet light. The fingerprint development liquid based on the cationic polyphenyleneethynylene thienyl fluorescent conjugated polymer provided by the invention can overcome the interference of background patterns, can develop grease fingerprints and blood fingerprints on different objects, and has the characteristics of simple preparation process and convenient development operation.

Description

technical field [0001] The invention relates to a fingerprint display technology, in particular to a polyphenylene acetylene thienylene fluorescent conjugated polymer, a preparation method and its application in the display of grease fingerprints and blood fingerprints, belonging to the application field of fluorescent polymer materials. Background technique [0002] There are uneven patterns on the skin of the palms and soles of people. The raised places are called "ridges", the sunken places are called "grooves", and the traces left by the ridges on the object are called fingerprints. The ridges and grooves on human skin are formed in the embryonic period, and they hardly change during the growth process, that is, fingerprints have the characteristics of "lifetime change"; secondly, there are countless combinations of details such as the starting point, bifurcation, and ending point of the ridges This shows that everyone's fingerprints are unique, that is, the second featu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12C09K11/06A61B5/1172
CPCC08G61/126C09K11/06A61B5/1172C08G2261/314C08G2261/124C08G2261/146C08G2261/1424C08G2261/18C08G2261/3223C08G2261/3422C08G2261/522C09K2211/1458C09K2211/1425
Inventor 范丽娟张弛马荣梁樊智楠周红
Owner SUZHOU UNIV
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