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
View PDF2 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 difficul

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Glass transition temperatureaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap