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A Novel Block Polyimide Material and Its Preparation and Application in Gas Separation

A gas separation, polyimide technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve problems such as performance loss, and achieve the effect of excellent solubility

Active Publication Date: 2020-10-02
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

Due to the existence of multiple phase transition processes, this method has performance loss and needs further optimization

Method used

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  • A Novel Block Polyimide Material and Its Preparation and Application in Gas Separation
  • A Novel Block Polyimide Material and Its Preparation and Application in Gas Separation
  • A Novel Block Polyimide Material and Its Preparation and Application in Gas Separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 6FDA-DMMDA / 6FDA-DAM block copolymer

[0077] Step a: Prepare the oligomeric block (the degree of polymerization is 8), in a 100mL flask equipped with a reflux condenser, a mechanical stirrer, and nitrogen flushing, 1.1327g (5.0005mmol) 3,3'-dimethyl -4,4'-diaminodiphenylmethane (DMMDA) was dissolved in 12g of m-cresol, and 2.5439g (5.7264mmol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA) was gradually added to the solution , the solution was warmed to 180 °C under a nitrogen atmosphere and stirred for 8 h.

[0078] Step b: After the temperature of the solution obtained in Step a of Example 1 was cooled to room temperature, 20 g of m-cresol was added, followed by 1.0139 g (6.7494 mmol) of 2,4,6-trimethyl-m-phenylenediamine (DAM ) and 2.6666g (6.0026mmol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride and then the solution was heated to 180°C under a nitrogen atmosphere and stirred for 8h. Then, according to the condition of distilling off the sol...

Embodiment 2

[0081] 6FDA-DMMDA / 6FDA-DAM block copolymer

[0082] Step a: Prepare the oligomeric block (the degree of polymerization is 8), in a 100mL flask equipped with a reflux condenser, a mechanical stirrer, and nitrogen flushing, 1.1327g (5.000mmol) 3,3'-dimethyl -4,4'-Diaminodiphenylmethane (DMMDA) was dissolved in 12g of m-cresol, and 2.5588g (5.76mmol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA) was gradually added to the solution , the solution was warmed to 180 °C under a nitrogen atmosphere and stirred for 8 h.

[0083] Step b: After the temperature of the solution obtained in Step a of Example 1 was cooled to room temperature, 20 g of m-cresol was added, followed by 0.5516 g (3.672 mmol) of 2,4,6-trimethyl-m-phenylenediamine (DAM ) and 1.2936g (2.912mmol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride, then the solution was heated to 180°C under a nitrogen atmosphere and stirred for 8h. Then, according to the condition of distilling off the solvent, an...

Embodiment 3

[0086] 6FDA-DMMDA / 6FDA-DAM block copolymer

[0087] Step a: To prepare the oligomeric block (the degree of polymerization is 4), in a 100mL flask equipped with a reflux condenser, a mechanical stirrer, and nitrogen flushing, 0.4526g (1.9998mmol) of 3,3'-dimethyl-4, 4'-diaminodiphenylmethane (DMMDA) was dissolved in 10g of m-cresol, and 1.1907g (2.6803mmol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA) was gradually added to the solution. The solution was warmed to 180 °C under nitrogen atmosphere and stirred for 8 h.

[0088]Step b: After the temperature of the solution obtained in step a of Example 2 was cooled to room temperature, 15 g of m-cresol was added, followed by 0.4918 g (3.2728 mmol) of 2,4,6-trimethyl-m-phenylenediamine (DAM ) and 1.1516g (2.5924mmol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride, and then the solution was heated to 180°C under a nitrogen atmosphere and stirred for 8h. Then, according to the condition of distilling off the ...

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Abstract

The invention relates to synthesis of a block polyimide material for preparing a gas separation membrane. A low-cost monomer material is used for preparing the novel block polyimide material, and by utilizing a high-temperature solution method, the problem that in a traditional two-step method, monomers with poor reactivity cannot be synthesized into a high-molecular polymer is avoided. Meanwhile,in the membrane preparation process, by directly using the synthesized block polyimide solution to directly prepare the gas separation membrane, the loss of gas separation performance caused by repeated phase inversion is reduced; besides, by carrying out annealing on the block polyimide gas separation membrane, the gas separation performance of the block polyimide gas separation membrane is improved.

Description

technical field [0001] The invention belongs to the field of macromolecular chemistry and polymers, and relates to the synthesis of a novel block polyimide and the preparation of a high-selectivity gas separation membrane with improved performance by using the material. Background technique [0002] Polyimide resin is a polymer mainly having an amorphous structure, and exhibits excellent thermal stability, corrosion resistance, high mechanical strength due to its rigid structure. Therefore, in the field of gas membrane separation, it is considered to have great development prospects. [0003] However, the current use of polyimide for gas separation faces certain challenges. There is an inverse correlation between gas permeability and gas selectivity, and it is difficult to take both at the same time. Different from random copolymerized polyimide, block copolymerized polyimide material can combine the advantages of different block materials, and it is expected to take into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18B01D69/06B01D71/64B01D53/22
CPCB01D53/228B01D69/06B01D71/64C08G73/1042C08J5/18C08J2379/08Y02C20/20Y02P20/151
Inventor 任吉中冯雨轩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI