Synthesis method for block-type sulfonated polyimides-polybenzimidazole proton exchange membrane material

A technology of sulfonated polyimide and polybenzimidazole, which is applied in the field of functional polymer materials and electrochemistry, can solve problems such as poor hydrolysis resistance and decreased electrical conductivity, and achieve improved electrical conductivity, improved dimensional stability and The effect of mechanical properties

Inactive Publication Date: 2014-04-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To overcome the disadvantages of poor hydrolysis resistance of sulfonated polyimide and the conductivity is sensitive to humidity and the conductivity drops sharply at high temperature

Method used

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  • Synthesis method for block-type sulfonated polyimides-polybenzimidazole proton exchange membrane material
  • Synthesis method for block-type sulfonated polyimides-polybenzimidazole proton exchange membrane material
  • Synthesis method for block-type sulfonated polyimides-polybenzimidazole proton exchange membrane material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis and preparation of block polybenzimidazole-sulfonated polyimide (PBI-b-SPI-80) with sulfonation degree of 80%

[0032] (1) Put 2.1864g (10mmol, 98%) 3,3'-diaminobenzidine (DAB) and 47g polyphosphoric acid in a 250ml three-necked flask, connect nitrogen inlet, drying tube, nitrogen outlet and mechanical stirrer . Start to raise the temperature while feeding nitrogen, and keep it at 150° C. for 30 minutes, so that DAB can be uniformly dispersed and dissolved in polyphosphoric acid. Then add 2.49g (10mmol, 99%) of isophthalic acid (IPA), 0.0352g (0.02564mmol, 99%) of p-aminobenzoic acid (PABA), and add 2.84g (20mmol) of P 2 o 5 In order to enhance the absorption of the reaction product water, drop two drops of triphenylphosphine as a cocatalyst, and keep the reaction at 200°C for 20h. After the temperature of the reaction system is cooled to room temperature, it is poured into deionized water for precipitation, and the polyphosphoric acid is removed by repeate...

Embodiment 2

[0036] Preparation of block polybenzimidazole-sulfonated polyimide (PBI-b-SPI-100) with 100% sulfonation degree

[0037] (1) Put 2.1864g (10mmol, 98%) 3,3'-diaminobenzidine (DAB) and about 50g polyphosphoric acid in a 250ml three-necked flask, connect nitrogen inlet, drying tube, nitrogen outlet and mechanical mixer. Start to raise the temperature while feeding nitrogen, and keep it at 150° C. for 30 minutes, so that DAB can be uniformly dispersed and dissolved in polyphosphoric acid. Then add 2.49g (10mmol, 99%) of isophthalic acid (IPA), 0.0352g (0.02564mmol, 99%) of p-aminobenzoic acid (PABA), and add 4.26g (30mmol) of P 2 o 5 In order to enhance the absorption of water in the reaction product, drop three drops of triphenylphosphine as a cocatalyst and keep it at 200°C for 20 hours. After the temperature of the reaction system is cooled to room temperature, it is poured into deionized water for precipitation, and the polyphosphoric acid is removed by repeated washing. S...

Embodiment 3

[0041] Preparation of Block Polybenzimidazole-Sulfonated Polyimide (PBI-b-SPI-120) with Sulfonation Degree of 120%

[0042] (1) Preparation of amino-terminated PBI-NH 2 (Polymerization degree 40) The reaction process is as follows, put 2.1864g (10mmol, 98%) 3,3'-diaminobenzidine and 63g polyphosphoric acid in a 250ml three-necked flask, connect the nitrogen inlet, drying tube, nitrogen outlet and mechanical stirrer. Start to raise the temperature while feeding nitrogen, and keep it at 150° C. for 30 minutes, so that DAB can be uniformly dispersed and dissolved in polyphosphoric acid. Then add 2.49g (10mmol, 99%) of isophthalic acid (IPA), 0.0352g (0.02564mmol, 99%) of p-aminobenzoic acid (PABA), and add 4.26g (30mmol) of P 2 o 5 In order to enhance the absorption of the reaction product water, drop two drops of triphenylphosphine as a cocatalyst, and keep the reaction at 200°C for 20h. After the temperature of the reaction system is cooled to room temperature, it is poured...

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Abstract

The invention relates to a synthesis method for a block-type sulfonated polyimides-polybenzimidazole proton conductive material. The solution polycondensation method is adopted, wherein tetramine and diacid are used as monomers, and are mixed with a sealing terminal agent to prepare polybenzimidazole with the end sealed by an amino group; dianhydride, non-sulfonated diamine and sulfonated diamine are adopted as monomers to prepare sulfonated polyimide with the end sealed by an anhydride; the saturated sodium chloride solution substitution method is adopted to convert the sulphonic-acid-type sulfonated polyimide into sodium-type sulfonated polyimide; polybenzimidazole with the end sealed by the amino group and the polyimide with the end sealed by anhydride are further polymerized to prepare block-type polybenzimidazole-sulfonated polyimides; the segment of polybenzimidazole has a certain high temperature proton transference function and has no dependency on water, can increase the conductivity of a membrane material at a high-temperature and low-humidity condition; compared with the conventional sulfonated polyimide membrane, the hydrolytic stability, the dimensional stability and the mechanical property are remarkably increased; the block-type sulfonated polyimides-polybenzimidazole proton conductive material has a wide application prospect in the field of polymer electrolyte membrane fuel cells.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials and electrochemistry, and specifically relates to a synthesis method of a block-type sulfonated polyimide-polybenzimidazole proton exchange membrane material. The proton exchange membrane material of the invention can be applied to fuel cell materials. Background technique [0002] Polymer electrolyte membrane fuel cells (PEMFCs) efficiently convert chemical energy into electrical energy through redox reactions, and can be used as energy sources for transportation, power stations, and portable power supplies. Over the past 30 years, DuPont's Nafion ? The representative perfluorosulfonic acid membrane is widely used because of its high electrical conductivity, excellent oxidation resistance and chemical stability. However, perfluorosulfonic acid membranes have disadvantages such as high cost, low dimensional stability, and low mechanical properties. In recent years, the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G73/18C08G73/10C08J5/22H01M2/16
CPCY02E60/10
Inventor 潘海燕浦鸿汀江斌常志宏
Owner TONGJI UNIV
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