Fluorine ion color development sensing polyimide film and preparation method and application thereof

A technology for sensing polyimide and polyimide films, which is used in the fields of ion detection and material science to achieve the effects of convenient fabrication, excellent thermal stability, and enhanced charge transfer effect.

Active Publication Date: 2019-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no color-sensitive solid-state film material that can detect fluoride ions by visual color change

Method used

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  • Fluorine ion color development sensing polyimide film and preparation method and application thereof
  • Fluorine ion color development sensing polyimide film and preparation method and application thereof
  • Fluorine ion color development sensing polyimide film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039]Add 1.241g of 4,4'-oxydiphthalic anhydride (ODPA) and 1.522g of 2,7-dihydroxy-9,9-bis(4-aminophenyl)fluorene (AHF) into a 100mL one-necked flask , add 25 ml of m-cresol as a solvent, 8 drops of isoquinoline as a catalyst, stir and mix evenly, vacuumize at room temperature-argon circulation twice, and then under the protection of argon, at 85 ° C and 200 ° C respectively Each reaction was 12 hours; the reaction was completed, cooled to room temperature to obtain a viscous polyimide solution; it was added dropwise to 400mL ethanol to produce a fibrous precipitate, after the addition was completed, stand and filter; the precipitate was placed at 100°C Dry under vacuum for 10 hours to obtain fibrous polyimide; take partly dried fibrous polyimide and dissolve it in N,N-dimethylacetamide, control the solid content to 10%, fully stir and dissolve, and spread evenly On a clean silica glass plate, vacuum several times until there are no bubbles, dry in a vacuum oven at 70°C for 1...

Embodiment 2

[0043] 1.241g 4,4'-oxydiphthalic anhydride (ODPA) was mixed with 1.572g 2,7-dihydroxy-9,9-bis(3,5-dimethyl-4-aminophenyl)fluorene ( DMAHF) into a 100mL single-necked flask, add 30ml of N,N-dimethylformamide as a solvent, 6ml of acetic anhydride and 4ml of pyridine as a catalyst, magnetically stir and mix evenly, vacuumize at room temperature and circulate twice with argon , and then under the protection of argon, reacted at 25°C for 6 hours, then raised the temperature to 150°C and continued to react for 18 hours; ended the reaction, cooled to room temperature, and obtained a viscous polyimide solution; added it dropwise to 400mL ethanol During the process, a fibrous precipitate was produced, and after the dropwise addition was completed, it was left to stand and filtered; the precipitate was vacuum-dried at 105°C for 8 hours to obtain a fibrous polyimide; the partially dried fibrous polyimide was dissolved in N,N- In dimethylformamide, the solid content is controlled to be 10...

Embodiment 3

[0047] Add 1.746g of 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA) and 1.921g of 2,7-dihydroxy-9,9-bis(4-aminophenyl)fluorene (DMAHF) to a 100mL single port In the flask, add 30 ml of m-cresol as a solvent, 10 drops of isoquinoline as a catalyst, magnetically stir and mix evenly, vacuumize at room temperature-argon circulation twice, and then react at 80°C under the protection of argon 6 hours, then raise the temperature to 220°C and react for 6 hours; end the reaction, cool to room temperature to obtain a viscous polyimide solution; add it dropwise to 500mL ethanol to produce a fibrous precipitate, after the addition is completed, let it stand Filtration; vacuum drying the precipitate at 95°C for 12 hours to obtain a fibrous polyimide; dissolving the partially dried fibrous polyimide in N,N-dimethylacetamide to control the solid content to 10%, After fully stirring and dissolving, spread it evenly on a clean silica glass plate, vacuumize it several times until the...

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Abstract

The invention discloses a fluorine ion color development sensing polyimide film and a preparation method and application thereof. The preparation method of the fluorine ion color development sensing polyimide film comprises the following steps of: mixing an aromatic diamine monomer and an aromatic dianhydride monomer in a strong polar aprotic organic solvent, adding a catalyst, and vacuumizing atroom temperature; introducing argon gas to circulate for a plurality of times and then reacting under the protection of the argon gas to obtain a polyimide solution; preparing fibrous polyimide; dissolving fibrous polyimide in a strong polar aprotic organic solvent, fully stirring and dissolving, uniformly smearing the solution on a clean glass plate, removing the solvent, cooling, soaking in hotwater to strip the film, and obtaining the fluorine ion color development sensing polyimide film. The polyimide film containing hydroxyfluorene can be directly cut into sheets for use, sensor devicesare very convenient to manufacture, the sensitivity reaches 10-4mol / L and the selectivity is high when the polyimide film is used for measuring fluorine ions.

Description

technical field [0001] The invention relates to a polyimide thin film sensing material for measuring fluoride ions, in particular to a kind of polyimide thin film sensing material which can detect fluoride ion visually, and its preparation method and application , belonging to the field of material science and ion detection technology. Background technique [0002] As the smallest anion, fluoride ion plays an important and basic role in many biological and chemical processes. An appropriate amount of fluoride ion can prevent tooth decay and osteoporosis, but excessive intake of fluoride ion will cause fluorosis. High concentration of fluoride ion Ions can seriously harm the environment, and the existence of fluoride ions seriously affects human life. In many occasions, it is necessary to quickly and efficiently identify and detect the concentration of fluoride ions. Using chemical substances sensitive to fluoride ions, with the help of instruments, using ultraviolet-visible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G73/10G01N21/77G01N21/78C08L79/08
CPCC08J5/18C08J2379/08C08G73/1039C08G73/1071C08L2203/16C08G73/10C08J2333/24G01N21/29G01N21/78
Inventor 刘述梅吴彦城赵建青黄皓浩
Owner SOUTH CHINA UNIV OF TECH
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