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Polyimide polymer, preparation method and application

A technology of polyimide and polymer, which is applied in the application of the above-mentioned gas separation membrane and the preparation field of the above-mentioned polymer, can solve the problems such as difficult composite membrane coating, difficult to find good solvent, etc.

Inactive Publication Date: 2006-04-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In summary, it is difficult for the existing polyimide membrane materials to have high gas permeability and gas selectivity at the same time; it is also difficult to find a good solvent when making the membrane, or it cannot be dissolved in weakly soluble easily Volatile solvent, difficult to be used as a composite film coating

Method used

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  • Polyimide polymer, preparation method and application
  • Polyimide polymer, preparation method and application
  • Polyimide polymer, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 4.724g 3,5-diamino-2,4,6-trimethylbenzenesulfonate lithium salt (MLi), 41.226g dimethyl sulfoxide and 9.018g 4 in a stirred 100ml three-neck round bottom flask , 4'-hexafluoroisopropylidene-phthalic anhydride (6FDA) powder. Stir the reaction mixture at 20-30°C under nitrogen protection for 3 hours to form a very viscous solution, then add 10g of acetic anhydride and 2g of triethylamine for imidization, react for 4 hours, settle in acetone, and filter , washed three times with acetone, dried at room temperature for 3 hours, and then dried at 170° C. for 24 hours to obtain 6FDA-MLi polyimide. figure 1 is the TGA curve of polymer 6FDA-MLi. It can be seen from the figure that the glass transition temperature of 6FDA-MLi polyimide is 244.09°C; figure 2 is the DSC curve of polymer 6FDA-MLi. It can be seen from the figure that the 5% thermal weight loss temperature of 6FDA-MLi polyimide is 286.07°C.

Embodiment 2

[0034] Add 4.724g 3,5-diamino-2,4,6-trimethylbenzenesulfonate lithium salt (MLi), 34.341g dimethylsulfoxide and 4.509g 4 to a stirred 100ml three-neck round bottom flask , 4'-hexafluoroisopropylidene-phthalic anhydride (6FDA) and 2.214 g of pyromellitic dianhydride (PMDA) powder. Stir the reaction mixture at 20-30°C for 3 hours to form a very viscous solution, then add 10g of acetic anhydride and 2g of triethylamine for imidization, react for 4 hours, settle in acetone, filter and wash with acetone three times , Dry at room temperature for 3 hours and then dry at 170° C. for 24 hours to obtain light yellow 6FDA / PMDA (50 / 50)-MLi type polyimide powder.

Embodiment 3

[0036]Add 4.724g 3,5-diamino-2,4,6-trimethylbenzenesulfonate lithium salt (MLi), 27.457g dimethyl sulfoxide and 4.428g Pyellitic dianhydride (PMDA) powder. Stir the reaction mixture at 20-30°C under nitrogen protection for 3 hours to form a very viscous solution, then add 10g of acetic anhydride and 2g of triethylamine for imidization, react for 4 hours, settle in acetone, and filter , washed three times with acetone, dried at room temperature for 3 hours, and then dried at 170° C. for 24 hours to obtain 6FDA-MLi polyimide.

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Abstract

A polyimide is prepared from 4, 4í»-hexafluoro isopropylene-phthalic anhydride, sym-phenylbutanoic anhydride, and 3,5-diamino-2,4,6-trimethyl phenylsulfonic acid or its salt. A process for using said polymer to prepare gas separating membrane is also disclosed. Said gas separating membrane has high gas permeability and selectivity, and high solubility.

Description

technical field [0001] The present invention relates to a polyimide polymer, in particular to a film-forming polyimide polymer. [0002] The invention also relates to a process for the preparation of the above-mentioned polymers. [0003] The present invention also relates to the preparation of gas separation membranes using the above-mentioned polymers. [0004] The present invention also relates to the use of the above-mentioned gas separation membrane. Background technique [0005] The application of polymers in gas separation is known in the art. There have been a large number of literatures reporting the relationship between polymer structure and gas separation properties. Improves gas permeability and increases selectivity for certain gas mixtures. Studies have shown that polyimide is a rigid rod polymer with ideal gas separation characteristics, see Chinese patent CN1293081A. If structurally rigid dianhydrides are used in combination with substituted diamines, the...

Claims

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Application Information

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IPC IPC(8): C08G73/10B01D71/64
Inventor 刘勤华肖通虎刘健辉林斌曹义鸣邓麦村袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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