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Synthetic method of kapton polyimide in ionic liquid

A technology of ionic liquid and polyimide, which is applied in the field of polyimide synthesis, can solve problems such as harsh reaction conditions and complex synthesis operations, and achieve increased speed and yield, cheap and easy-to-obtain raw materials, and a clean and safe preparation environment Effect

Active Publication Date: 2019-03-08
陈铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the invention is to propose a method for synthesizing Kapton polyimide in an ionic liquid, to solve the complex synthetic operation in the preparation of polyimide, the problem of harsh reaction conditions

Method used

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  • Synthetic method of kapton polyimide in ionic liquid
  • Synthetic method of kapton polyimide in ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 218.12 mg of pyromellitic dianhydride and 200.24 mg of 4,4'-oxybenzidine diamine in 5.0 mL of 1-ethyl-3-methylimidazolium acetate ionic liquid; under stirring conditions, gradually heat to 80 degrees Celsius; after 8 hours of reaction, the precipitated solid was separated by filtration; the obtained solid was washed once with water, three times with methanol, and dried to obtain the product Kapton polyimide with a yield of 92%, an average molecular weight of 34.1kDa, and a molecular weight of 34.1kDa. The distribution is 2.42.

Embodiment 2

[0029] Dissolve 218.12 mg of pyromellitic dianhydride and 200.24 mg of 4,4'-oxybenzidine diamine in 5.0 mL of 1-butyl-3-methylimidazolium acetate ionic liquid; under stirring conditions, gradually heat to 80 degrees Celsius; after 8 hours of reaction, the separated solid was filtered and separated; the obtained solid was washed once with water, three times with methanol, and dried to obtain the product Kapton polyimide with a yield of 89%, an average molecular weight of 32.4kDa, and a molecular weight of 32.4kDa. The distribution is 2.24.

Embodiment 3

[0031] Dissolve 218.12 mg of pyromellitic dianhydride and 200.24 mg of 4,4'-oxybenzidine diamine in 5.0 mL of 1-ethyl-3-methylimidazolium hexafluorophosphate ionic liquid; under stirring conditions, gradually heated to 80 degrees Celsius; after 8 hours of reaction, the precipitated solid was separated by filtration; the obtained solid was washed with water once, washed with methanol three times, and dried to obtain the product Kapton polyimide with a yield of 42% and an average molecular weight of 16.1kDa, The molecular weight distribution was 2.23.

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Abstract

The present invention relates to the field of chemistry and macromolecular materials. Provided is a method for synthesizing a Kapton polyimide in an ionic liquid. The method for synthesizing the Kapton polyimide in the ionic liquid uses an imidazole ionic liquid as a reaction medium, and benzenetetracarboxylic dianhydride and 4,4'-oxydianiline as raw materials. One-pot, one-step synthesis of the Kapton polyimide is achieved by 1) heating, or 2) adding a non-nucleophilic base or a weak nucleophilic base, or 3) heating and adding the non-nucleophilic base or the weak nucleophilic base. The method for synthesizing the Kapton polyimide in the ionic liquid uses cheap and easily acquired raw materials, is easy to operate, safe, and clean, and offers high product yield and reaction speed. The method can help reduce costs and achieve large scale production.

Description

Technical field: [0001] The invention relates to the field of chemistry and polymer materials, in particular to a method for synthesizing polyimide in ionic liquid. Background technique: [0002] Kapton is the trade name of a polyimide polymer developed by DuPont. The chemical name for Kapton polyimide is poly(pyromellitic anhydride-co-4,4'-diaminodiphenyl ether). The molecular structure of Kapton polyimide is Wherein n in the above molecular structural formula is a natural number greater than 1. Kapton polyimide has high thermal and chemical stability, excellent mechanical and dielectric properties and good biocompatibility, and is widely used in the aerospace industry, automobile manufacturing, 3D printing, motor manufacturing, and goods packaging and other fields [1][2]. The application of Kapton polyimide in the aerospace field can be traced back to the Apollo moon landing mission of NASA in the 1960s [3], and it is still an important material for space stations, sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10
CPCC08G73/10
Inventor 陈铭
Owner 陈铭
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