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Quaternized polybenzimidazoles and preparation method thereof

A technology of polybenzimidazole and benzimidazole, which is applied in the field of ion exchange membranes, can solve the problems of affecting membrane electrode assembly, poor processing performance, and low catalytic efficiency of catalysts, and achieve good methanol permeation resistance, improve output characteristics, and OH -Effect of increased ion conductivity and solubility

Inactive Publication Date: 2009-03-25
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main problems of PEMFC are: complex system, high fuel permeability, low catalytic efficiency of catalyst, high price, etc.
However, due to the high rigidity of the structure and the strong interaction between chains and chains, polybenzimidazole generally has poor solubility and refractory properties, resulting in poor processing properties, which limits its application in many aspects; direct alkali The conductivity of doped polybenzimidazole is not high and unstable, and the mechanical properties of the doped film are low, which affects the assembly of subsequent membrane electrodes.

Method used

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  • Quaternized polybenzimidazoles and preparation method thereof
  • Quaternized polybenzimidazoles and preparation method thereof
  • Quaternized polybenzimidazoles and preparation method thereof

Examples

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Embodiment 1

[0049] Embodiment 1: x is the preparation of the quaternization poly(2,5-benzimidazole) of 2 in the branch

[0050] The raw material poly(2,5-benzimidazole) (ABPBI) (0.01mol, 1.16g) was added to the solvent dimethyl sulfoxide, stirred and added to a reflux device, and dissolved at 250°C for 30 hours. In this solution, polybenzo The mass concentration of imidazole is 5%; the resulting solution is added to the dehydrogenation reagent lithium hydride at 100°C for dehydrogenation reaction. The reaction time is 36 hours. Methylbromoethylamine, reacted for 40 hours, poured the resulting product into the precipitant methanol, washed with methanol, and dried, wherein the molar ratio of dehydrogenation agent to polybenzimidazole was 20, tertiary ammonium halide and polyphenylene The molar ratio of imidazole is 10; the obtained product is added to the solvent N,N-dimethylformamide, stirred and added to a reflux device, dissolved at 250° C. for 30 hours, and the mass concentration of the...

Embodiment 2

[0051] Embodiment 2: x is the preparation of the quaternization poly(2,5-benzimidazole) of 1 in the branch

[0052] Add the raw material poly(2,5-benzimidazole) (1.16g, 0.01mol) into the solvent N-methylpyrrolidone, stir and add a reflux device, dissolve at 100°C for 6 hours, the polybenzimidazole in this solution The mass concentration is 0.2%; add the dehydrogenation reagent sodium hydride to the resulting solution at 50°C for dehydrogenation reaction, the reaction time is 4 hours, and add the tertiary ammonium halide N,N-dimethyl to the obtained product at 70°C Iodomethylamine, reacted for 12 hours, poured the resulting product into precipitant acetone, washed with acetone, and dried, wherein the molar ratio of dehydrogenation agent to polybenzimidazole was 1.5, tertiary ammonium halide and polybenzimidazole The molar ratio of the obtained product is 2; the obtained product is added in the solvent N-methylpyrrolidone, stirred and added to a reflux device, dissolved at 100°C...

Embodiment 3

[0053] Embodiment 3 branched chain x is the preparation of quaternized poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] of 5

[0054] The raw material poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (PBI) (0.01mol) was added in the solvent dimethyl sulfoxide, stirred and added to the reflux device, at 250 ℃ for 30 hours, the mass concentration of polybenzimidazole in this solution is 5%; the resulting solution is added to the dehydrogenation agent lithium hydride at 100 ℃ for dehydrogenation reaction, the reaction time is 36 hours, and the obtained product is 150 ℃ Add the tertiary ammonium halide N,N-dimethylbromylamylamine, react for 40 hours, pour the resulting product into the precipitant methanol, wash with methanol, and dry, wherein, the molar ratio of dehydrogenation agent to polybenzimidazole 20, the molar ratio of tertiary ammonium halides to polybenzimidazole is 10; add the obtained product into the solvent N,N-dimethylformamide, stir and add a reflux device, dissolve at ...

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Abstract

The invention provides quaternized polybenzimidazole and a preparation method thereof. Polyanions are formed by polybenzimidazole and derivatives thereof (PBIs) under the function of a dehydrogenized reagent and a solvent, small molecules such as tertiary amine halide, methyl iodide and the like are inoculated to the side chain of the polybenzimidazole molecule and ion exchange is carried out in an alkaline solution, therefore, the quaternized polybenzimidazole with good thermal stability, solubility and membrane forming performance can be prepared. The quaternized polybenzimidazole can be used as an OH<->ion-exchange membrane in alkali fuel cells and has broad application prospect.

Description

technical field [0001] The present invention relates to a kind of quaternized polybenzimidazole and preparation method thereof, used as OH - An ion exchange membrane belongs to the technical field of ion exchange membranes. Background technique [0002] Fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy. Due to its high energy conversion rate, no pollution and low noise, it is considered to be one of the main ways to solve future energy problems. There are many types of fuel cells. In recent years, proton exchange membrane fuel cells (PEMFC) using proton exchange membranes (such as DuPont's Nafion membrane) as electrolytes have developed rapidly. [0003] At present, the main problems of PEMFC are: complex system, high fuel permeability, low catalytic efficiency of catalyst, and high price. In the strongly acidic environment of proton exchange membranes, only platinum-based noble metal catalysts can exist stably...

Claims

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Application Information

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IPC IPC(8): C08G73/18B01J41/12H01M8/02H01M2/16B01J41/13H01M8/0239H01M50/411
CPCY02E60/50
Inventor 王彪唐艳芳王华平
Owner DONGHUA UNIV
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