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A polymer sample based on rhodamine derivatives and its application in water content analysis

A technology of polymers and derivatives, which is applied in the direction of chemical reaction analysis of materials, material analysis by observing the influence of chemical indicators, and material excitation analysis, etc. It can solve the problems of narrow detection range, expensive raw materials, and complicated operation. and other problems, to achieve the effect of convenient detection and low cost

Active Publication Date: 2018-11-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the invention patent application with the application number 201310406677.0 discloses a method for detecting water content in ethanol by using a ruthenium complex using a fluorescence method, but its operation is complicated, and there are disadvantages such as expensive raw materials and narrow detection range.

Method used

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  • A polymer sample based on rhodamine derivatives and its application in water content analysis
  • A polymer sample based on rhodamine derivatives and its application in water content analysis
  • A polymer sample based on rhodamine derivatives and its application in water content analysis

Examples

Experimental program
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Effect test

Embodiment 1

[0046]Weigh 0.96g of Rhodamine B and 3mL of excess hydrazine hydrate, dissolve them in 40mL of absolute ethanol, and stir magnetically for 12h under reflux, the solution turns yellow, and the fluorescence of Rhodamine B disappears. Anhydrous ethanol was distilled off under reduced pressure to obtain a crude product. Dissolve the crude product in 70ml of 1mol / L hydrochloric acid, and add an excess of 1mol / L sodium hydroxide solution to the solution, adjust the pH value of the solution to 9-10, obtain a pink precipitate after filtration, and vacuum dry for 48 hours to obtain Rhodamine B Hydrazide.

[0047] Weigh 0.456g rhodamine B hydrazide and 0.107g 2-pyridine formaldehyde, and dissolve them in 25mL methanol, add three drops of acetic acid as catalyst, stir magnetically for 2h under reflux, cool to room temperature, filter to obtain a light red precipitate, and use methanol / diethyl ether (1:1 V / V) and then vacuum-dried for 48 hours to obtain rhodamine derivative I.

[0048]...

Embodiment 2

[0057] Weigh 0.96g of rhodamine 6G and 3mL of excess hydrazine hydrate, dissolve them in 40mL of absolute ethanol, and stir magnetically for 12h under reflux, the solution turns yellow, and the fluorescence of rhodamine B disappears. Anhydrous ethanol was distilled off under reduced pressure to obtain a crude product. Dissolve the crude product in 70ml of 1mol / L hydrochloric acid, and add an excess of 1mol / L sodium hydroxide solution to the solution, adjust the pH value of the solution to 9-10, obtain a pink precipitate after filtration, and vacuum dry for 48 hours to obtain Rhodamine B Hydrazide.

[0058] Weigh 0.456g rhodamine 6G hydrazide and 0.107g 2-pyridine formaldehyde, dissolve them in 25mL of methanol, add three drops of acetic acid as a catalyst, stir magnetically for 2h under reflux, cool to room temperature, and filter to obtain a light red precipitate. / diethyl ether (1:1 V / V) and then vacuum-dried for 48 hours to obtain the rhodamine derivative M.

[0059]

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Abstract

The invention relates to a rhodamine derivative-based polymer sample and the application thereof in the water content analysis. According to the technical scheme of the invention, a rhodamine derivative is dissolved in a mixed polymer solution of a non-water-soluble polymer and a water-soluble polymer to obtain a rhodamine derivative-based polymer solution for detecting the water content of an organic solvent. Or, the polymer solution of the rhodamine derivative is subjected to electrostatic spinning, and the electrostatic spinning of the rhodamine derivative is conducted on a metal film or another substrate made of other organic and inorganic materials to prepare a polymer film for detecting the water content of an organic matter. Or, the polymer solution of the rhodamine derivative is directly coated or sprayed on the surface of a base material to form a film and prepare the test paper for detecting the water content of the organic matter. The above obtained product is immersed in a to-be-measured water-containing organic solution to quickly change from the non / weak fluorescence state to the strong fluorescence state. Meanwhile, the color of the product changes from colorless / pink to bright red. Therefore, through observing the color change or the change in fluorescence signal, the water content of an organic solvent sample can be conveniently detected.

Description

technical field [0001] The invention relates to a rhodamine derivative-based polymer sample and its application in water content analysis, belonging to the technical field of water content detection in organic solvents. Background technique [0002] Water is the most common type of impurity in organic solvents. The water content in organic solvents will greatly affect the progress of chemical reactions, and even determine the products of the reactions. The determination of water content in organic solvents is one of the most important and frequently encountered analysis problems in the fields of chemical industry, medicine, food, environment and so on. The most classic and commonly used chemical analysis method for determining water content is the Karl Fischer titration method, which was invented by the German Karl Fischer in 1935. Although the method has been greatly improved, there are still cumbersome reagent preparation and configuration Harsh conditions, slow reaction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N21/78
CPCG01N21/64G01N21/78
Inventor 董丽杰袁野兰嵩滢赵广辉张扬
Owner WUHAN UNIV OF TECH
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