Preparation method of phosphoric acid-doped sulfonated polymer composite membrane with self-assembled structure

A sulfonated polymer, composite membrane technology, applied in structural parts, electrochemical generators, battery pack parts, etc., to achieve good mechanical properties, stable structure, and improve electrical conductivity.

Inactive Publication Date: 2011-12-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report about the self-assembly technology of double-substituted imidazolium ionic liquid and polymer to form a film, and the adsorption of phosphoric acid through the double-substituted imidazolium cationic structure to improve the conductivity of the ionic liquid-polymer composite film

Method used

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  • Preparation method of phosphoric acid-doped sulfonated polymer composite membrane with self-assembled structure
  • Preparation method of phosphoric acid-doped sulfonated polymer composite membrane with self-assembled structure
  • Preparation method of phosphoric acid-doped sulfonated polymer composite membrane with self-assembled structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of phosphoric acid-doped ionic liquid (BMIMCl) with self-assembled structure and sulfonated polyether ether ketone composite membrane (SPEEK-BMIM / H 3 PO 4 ) method steps are as follows.

[0030] (1) Add chloro-1-butyl-3-methylimidazole (BMIMCl) into the container, soak the sulfonated polyetheretherketone (SPEEK) membrane with a sulfonation degree of 64.3% in chloro-1-butyl Base-3-methylimidazole (BMIMCl), seal the container, and place it in an oven at 120°C for 1 h.

[0031] Among them, chloro-1-butyl-3-methylimidazole (BMIMCl) is an ionic liquid. In terms of mass ratio, the ratio of sulfonated polyether ether ketone (SPEEK) to chloro-1-butyl-3-methylimidazole (BMIMCl) is SPEEK:BMIMCl=1:160.

[0032] (2) After the reaction is completed, the temperature is naturally lowered. When the temperature of the reaction system drops to room temperature, the composite film is taken out, and the liquid adsorbed on the surface of the composite film is wiped dry.

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Embodiment 2

[0038] Preparation of phosphoric acid-doped ionic liquid (BMIMCl) with self-assembled structure and sulfonated polyether ether ketone composite membrane (SPEEK-BMIM / H 3 PO 4 ) method steps are as follows.

[0039] (1) Add chloro-1-butyl-3-methylimidazole (BMIMCl) into the container, soak the sulfonated polyether ether ketone (SPEEK) membrane with a sulfonation degree of 72.8% in chloro-1-butyl Base-3-methylimidazole (BMIMCl), seal the container, and place it in an oven at 100°C for 0.5 h.

[0040] Among them, chloro-1-butyl-3-methylimidazole (BMIMCl) is an ionic liquid. In terms of mass ratio, the ratio of sulfonated polyether ether ketone (SPEEK) to chloro-1-butyl-3-methylimidazole (BMIMCl) is SPEEK:BMIMCl=1:260.

[0041] (2) After the reaction is completed, the temperature is naturally lowered. When the temperature of the reaction system drops to room temperature, the composite film is taken out, and the liquid adsorbed on the surface of the composite film is wiped dry. ...

Embodiment 3

[0047] Preparation of phosphoric acid-doped ionic liquid (BMIMCl) with self-assembled structure and sulfonated polyether ether ketone composite membrane (SPEEK-BMIM / H 3 PO 4 ) method steps are as follows.

[0048] (1) Add chloro-1-butyl-3-methylimidazole (BMIMCl) into the container, soak the sulfonated polyether ether ketone (SPEEK) membrane with a sulfonation degree of 41.9% in chloro-1-butyl Base-3-methylimidazole (BMIMCl), seal the container, and place it in an oven at 130°C for 2 hours.

[0049] Among them, chloro-1-butyl-3-methylimidazole (BMIMCl) is an ionic liquid. In terms of mass ratio, the ratio of sulfonated polyether ether ketone (SPEEK) to chloro-1-butyl-3-methylimidazole (BMIMCl) is SPEEK:BMIMCl=1:60.

[0050] (2) After the reaction is completed, the temperature is naturally lowered. When the temperature of the reaction system drops to room temperature, the composite film is taken out, and the liquid adsorbed on the surface of the composite film is wiped dry. ...

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Abstract

The invention relates to a preparation method for a sulfonated polymer composite membrane doped with phosphoric acid and containing a self-assembly structure, which belongs to the technical field of fuel cells. The method comprises the following steps: soaking a sulfonated polyether-ether-ketone membrane in ionic liquid for airtight reaction, naturally cooling, soaking the composite membrane in deionized water, placing at room temperature, and slowly evaporating the moisture in the composite membrane; then drying the composite membrane in a drying oven until the weight of the composite membrane is constant, and naturally cooling to the room temperature; finally soaking the composite membrane in phosphoric acid water solution, and carrying out airtight soaking to obtain the sulfonated polymer composite membrane doped with the phosphoric acid and containing the self-assembly structure. The composite membrane prepared by the invention has favorable mechanical property and conductive performance and stable structure, thereby solving the leakage problem of the ionic liquid.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to the membrane electrolyte technology of proton exchange membrane fuel cells, in particular to a method for preparing a sulfonated polymer composite membrane doped with phosphoric acid and having a self-assembled structure. Background technique [0002] Ionic liquids are composed of organic cations and organic or inorganic anions, and are liquid ionic systems at room temperature or slightly higher than room temperature. Ionic liquids have the advantages of high ionic density, high ionic conductivity, and good thermal stability. As carriers of ions and protons, ionic liquids have been used in the development of membrane electrolytes for high-temperature proton exchange membrane fuel cells. At present, the development of ionic liquids as proton-conducting carriers mainly includes the polymerization of ionic liquids themselves to form membranes and the preparation of composite membra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08L71/08C08K3/32H01M8/02H01M2/16H01M8/0271H01M8/0284H01M50/446
CPCY02E60/50Y02E60/12
Inventor 何荣桓车全通杨景帅冯立
Owner NORTHEASTERN UNIV LIAONING
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