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Preparation and testing method of a non-conjugated fluorescent polymer

A fluorescent polymer, non-conjugated technology, used in luminescent materials, fluorescence/phosphorescence, chemical instruments and methods, etc., can solve the problem of not finding yellow and red emission, and achieve the effect of expanding the test method

Active Publication Date: 2021-11-05
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they often show excitation-dependent photoluminescence, efficient yellow and red emissions are rarely found

Method used

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  • Preparation and testing method of a non-conjugated fluorescent polymer
  • Preparation and testing method of a non-conjugated fluorescent polymer
  • Preparation and testing method of a non-conjugated fluorescent polymer

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Experimental program
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Embodiment 1

[0025] Preparation of fluorescent polylactic acid: anhydrous glucose, lactide, stannous octoate Sn(Oct) 2 The molar ratio is 1:70:0.35; weigh anhydrous glucose, lactide, stannous octoate Sn(Oct) according to the above molar ratio 2 In the flask, add a small amount of toluene to dissolve, and reflux at 140°C for 24 hours. After the reaction solution was concentrated, it was dropped into anhydrous ether for recrystallization, filtered, and the obtained solid was vacuum-dried for 12 hours to obtain a brown solid. For NMR characterization, see figure 1 .

[0026] Dissolve 0.1 g of the prepared brown solid in 5 mL of DMF solution with a concentration of 10 mg / mL, gradually dilute and prepare polymer solutions of various concentrations, and test the fluorescence spectrum from low concentration to high concentration, the entrance slit is 1.75 nm, and the exit slit is 1.25nm, the excitation wavelength is 380nm, the emission wavelength is 425nm and 485nm, and the maximum concentratio...

Embodiment 2

[0028] Preparation of fluorescent polylactic acid: anhydrous glucose, lactide, stannous octoate Sn(Oct) 2 The molar ratio is 1:120:0.6, weigh anhydrous glucose, lactide, stannous octanoate Sn(Oct) according to the above molar ratio 2 In the flask, add a small amount of toluene to dissolve, and reflux at 140°C for 24 hours. After the reaction solution was concentrated, it was dropped into anhydrous ether for recrystallization, filtered, and the obtained solid was vacuum-dried for 12 hours to obtain a brown solid.

[0029] Dissolve 0.3g of the prepared brown solid in 5mL of DMF solution, the concentration is 60mg / mL, gradually dilute and prepare polymer solutions of various concentrations, and test the fluorescence spectrum from low concentration to high concentration, the incident slit is 1.75nm, and the exit slit is 1.25nm, the excitation wavelength is 380nm, the emission wavelength is 425nm and 485nm, and the maximum concentration of fluorescence intensity is determined to b...

Embodiment 3

[0031] Preparation of fluorescent polylactic acid: anhydrous glucose, lactide, stannous octoate Sn(Oct) 2 The molar ratio is 1:180:0.9, and anhydrous glucose, lactide, stannous octoate Sn(Oct) are weighed according to the above molar ratio 2 In the flask, add a small amount of toluene to dissolve, and reflux at 140°C for 24 hours. After the reaction solution was concentrated, it was dropped into anhydrous ether for recrystallization, filtered, and the obtained solid was vacuum-dried for 12 hours to obtain a brown solid.

[0032] Dissolve 0.3g of the prepared brown solid in 5mL of DMF solution, the concentration is 60mg / mL, gradually dilute and prepare polymer solutions of various concentrations, and test the fluorescence spectrum from low concentration to high concentration, the incident slit is 1.75nm, and the exit slit is 1.25nm, the excitation wavelength is 380nm, the emission wavelength is 425nm and 485nm, and the maximum concentration of fluorescence intensity is determi...

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Abstract

The invention discloses a preparation and testing method of a non-conjugated system emitting fluorescent polymer, weighing anhydrous glucose, lactide, stannous octoate Sn(Oct) 2 In the flask, add toluene to dissolve, reflux at 140°C for 24 hours, concentrate the reaction solution, drop it into anhydrous ether for recrystallization, filter, and dry the obtained solid in vacuum for 12 hours to obtain a brown solid; dissolve the prepared brown solid in DMF In solution, prepare polymer solution, and test fluorescence spectrum from low concentration to high concentration. The beneficial effects of the present invention are as follows: with glucose as the polyhydroxyl center, a series of polylactic acids with different molecular weights are synthesized by using different feeding ratios, and the fluorescence changes at different concentrations are tested. With the movement of the excitation wavelength, the emission wavelength shows regularity. It provides a new test method for the detection of polylactic acid, an ideal green polymer material, and especially greatly expands the test method for nano-aggregates of polymer self-assembled drug-loading systems with polylactic acid as blocks.

Description

technical field [0001] The invention relates to the technical field of fluorescent polymer preparation, in particular to a method for preparing and testing a non-conjugated system emitting fluorescent polymer. Background technique [0002] Organic light-emitting materials have attracted much attention due to their unique photophysical properties and wide applications such as optoelectronic devices, chemical or biological probes and biological imaging. Besides traditional conjugated organic compounds, there are also some unconventional luminescent materials without classical chromophores such as aromatic rings. Among these materials, non-conjugated polymers with flexible segments and adjustable structures have attracted great interest because of their fundamental significance and broad application prospects. These polymers usually contain electron-rich heteroatoms such as N, O, S, etc. Compared with traditional conjugated materials, they have the advantages of simple prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/664C08G63/78C09K11/06G01N21/64
CPCC08G63/664C08G63/78C09K11/06C09K2211/145G01N21/64G01N2021/6419
Inventor 江金强高钰梅李果刘昭铁刘忠文陈建刚
Owner SHAANXI NORMAL UNIV
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