Method for modifying sulfonated polyaryetherketone and method for preparing polymer electrolyte material

A sulfonated polyaryletherketone and electrolyte material technology, which is applied in the field of functional polymer material preparation, can solve the problems of membrane electrode damage, membrane rupture, dimensional stability and poor mechanical strength, etc., and achieves simple operation and good mechanical strength. Effect

Inactive Publication Date: 2010-06-02
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the structural characteristics of this type of polymer itself, most sulfonated polyaryletherketone proton exchange membranes have contradictions between proton conductivity, dimensional stability (swellability), and mechanical strength. Conductivity requires the polymer to have a high degree of sulfonation, but too high a degree of sulfonation will lead to poor dimensional stability and mechanical strength of the membrane, which can easily lead to membrane electrode damage or even membrane rupture during the operation of DMFC and PEMFC , seriously affecting battery life

Method used

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  • Method for modifying sulfonated polyaryetherketone and method for preparing polymer electrolyte material
  • Method for modifying sulfonated polyaryetherketone and method for preparing polymer electrolyte material
  • Method for modifying sulfonated polyaryetherketone and method for preparing polymer electrolyte material

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example 1

[0021] Example 1: Dissolve sulfonated polyether ether ketone with a sulfonation degree of 75% in ethanol / water to prepare a solution with a percentage of 15%; weigh 100 parts of the polymer solution. Start stirring, under the protection of an inert gas, slowly add 2 parts of the reducing agent lithium aluminum hydride at 25°C, keep the reaction system at 30-80°C and continue the reaction for 6 hours, after filtering, concentrate the filtrate and dry it in vacuum to obtain the reduced Sulfonated polyetheretherketone; the dried reduction product is dissolved in dimethylformamide to prepare a solution with a mass percentage of 10% for use.

example 2

[0022] Example 2: Dissolve sulfonated polyether ether ketone sulfone with a sulfonation degree of 75% in dimethylacetamide to prepare a solution with a percentage of 8%; weigh 100 parts of the polymer solution. Start stirring, under the protection of an inert gas, slowly add 1.5 parts of zinc powder as a reducing agent at a temperature of 50°C, keep the reaction system at 50-100°C and continue to react for 8 hours, after filtering, concentrate the filtrate and dry it in vacuum to obtain the reduced Sulfonated polyether ether ketone sulfone; the dried reduction product is dissolved in dimethyl sulfoxide to prepare a solution with a mass percentage of 8% for use.

example 3

[0023] Example 3: Take 100 parts of 10% sulfonated polyetheretherketone reduction product solution, add 5 parts of catalyst (10% sulfuric acid / dimethylformamide solution), 2 parts of cross-linking agent malondialdehyde, at room temperature Stir and mix at 25°C for 0.5 hour to obtain a viscous film-forming solution. Apply the film-making solution on a clean glass plate to form a film, heat-treat in an oven at 60°C for 3 hours, 100°C for 4 hours, and 150°C for 6 hours, cool to room temperature, remove the film, soak in dilute sulfuric acid solution for 24 hours, and wash repeatedly. After drying in air, a cross-linked sulfonated polyetheretherketone membrane was obtained.

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Abstract

The invention relates to a method for modifying sulfonated polyaryetherketone and a method for preparing a polymer electrolyte material, and belongs to the technical field of the preparation of functional polymer materials. The method comprises the following steps: dissolving the sulfonated polyaryetherketone in a solvent; introducing inert gas and adding a reducing agent with stirring; performing vacuum drying to obtain reduced and modified sulfonated polyaryetherketone; adding a catalyst and a crosslinker into the solution of reduced and modified sulfonated polyaryetherketone under the inert gas, and stirring the mixture to prepare membrane liquor; performing membrane preparation; completing a crosslinking reaction in the process of membrane forming; and performing demoulding and washing for airing to obtain a cross-linked polymer electrolyte membrane material, wherein the crosslinker is polyaldehyde or polybasic carboxylic acid. The modification method has the characteristics of easily obtained raw materials and simple operation; the prepared cross-linked polymer electrolyte material has the advantages of excellent mechanical strength, conductivity, methanol-blocking performance and dimensional stability, can be directly used in the fields of methanol fuel cells, proton exchange membranes of proton exchange membrane fuel cells, ion exchange resin, membrane separation, sensors and the like, and has important application value.

Description

technical field [0001] The invention relates to a modification method of polyaryletherketone polymers containing sulfonic acid groups and a polymer electrolyte material prepared therefrom, belonging to the technical field of preparation of functional polymer materials. technical background [0002] Polyaryletherketone is a class of aromatic polymers containing ether bonds and carbonyl groups in the main chain, such as polyether ether ketone, polyether ether ketone ketone, polyether ketone, polyether ketone sulfone, etc. It is a class of engineering plastics with excellent comprehensive properties. It is widely used in aerospace, aviation, machinery, chemical industry, electric appliances and other fields. Sulfonated polyaryletherketone refers to a polymer containing sulfonic acid substituents on the aromatic ring of polyaryletherketone. It is a new type of functional material developed in recent years. Good application prospects. [0003] Polymer proton exchange membrane i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/48C08G8/28C08G75/23C08J5/22
Inventor 尚玉明谢晓峰冯少广王树博
Owner TSINGHUA UNIV
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