Semi-ipn (interpenetrating polymer network) proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and network structure, applied in the field of semi-interpenetrating network structure proton exchange membrane and its preparation, can solve the problems of affecting the stability and service life of membrane structure, easy expansion and rupture of proton exchange membrane, increase of methanol permeability coefficient, etc. , to achieve reliable dimensional stability, improved selective permeability, and high selective permeability.

Inactive Publication Date: 2014-04-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nafion series products have high proton conductivity, excellent mechanical properties, good chemical and electrochemical stability and long-lasting service life, but when they are applied to direct methanol fuel cells, there are the following shortcomings: a) Methanol penetration The coefficient is high, causing mixed potential at the cathode, resulting in low battery efficiency; b) the preparation process is cumbersome and expensive; c) the fluorine in the material will cause environmental pollution during the operation and recycling of the fuel cell
[0003] However, there are also many problems in the use of non-fluorocarbon sulfonic acid polymers. For example, to achieve high proton conductivity, sulfonic acid polymers with a high degree of sulfonation must be used.
Once the sulfonation of non-fluorocarbon sulfonic acid polymer is too high, the methanol permeability coefficient will also increase, and the higher water absorption will also make the proton exchange membrane easy to expand and rupture, affecting the structural stability and service life of the membrane.

Method used

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  • Semi-ipn (interpenetrating polymer network) proton exchange membrane and preparation method thereof
  • Semi-ipn (interpenetrating polymer network) proton exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of semi-interpenetrating network structure sulfonated polyether ether ketone proton exchange membrane:

[0026] The sulfonated polyetheretherketone, AMPS, EGDMA, benzophenone with a sulfonation degree of 45% are dissolved in NMP with a mass ratio of 150:90:10:3 to form a solution with a total mass fraction of 5%; The resulting solution was poured into a petri dish, and then placed in an oven at 100°C to dry for 5 hours. At this time, the residual mass fraction of the solvent in the film with a gel state was 60%; Put it in the cross-linking instrument for 15 minutes, soak in dilute sulfuric acid and wash with water to obtain a semi-interpenetrating network structure sulfonated polyether ether ketone proton exchange membrane.

Embodiment 2

[0028] Preparation of semi-interpenetrating network structure sulfonated polyethersulfone proton exchange membrane:

[0029] Sulfonated polyethersulfone, AMPS, EGDMA, and benzophenone with a sulfonation degree of 55% are dissolved in DMAc at a mass ratio of 200:70:30:3 to form a solution with a total mass fraction of 12%; The solution was poured into a petri dish, and then dried in an oven at 80°C for 10 hours. At this time, the residual mass fraction of the solvent in the gel-state film was 30%; Placed in the coupler for 30 minutes, soaked in dilute sulfuric acid and washed with water to obtain a semi-interpenetrating network structure sulfonated polyethersulfone proton exchange membrane.

Embodiment 3

[0031] Preparation of semi-interpenetrating network structure sulfonated polyphenylene ether proton exchange membrane:

[0032] Sulfonated polyphenylene ether, AMPS, EGDMA, and benzophenone with a sulfonation degree of 70% were dissolved in NMP at a mass ratio of 250:90:10:3 to form a solution with a total mass fraction of 8%; the resulting The solution was poured into a petri dish, and then dried in an oven at 120°C for 4 hours. At this time, the residual solvent in the obtained gel-state film was 35%; Place in the instrument for 20 minutes, soak in dilute sulfuric acid and wash with water to obtain a semi-interpenetrating network structure sulfonated polyphenylene ether proton exchange membrane.

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Abstract

The invention belongs to the field of membrane science, and particularly relates to a semi-ipn (interpenetrating polymer network) proton exchange membrane and a preparation method thereof. The preparation method comprises steps of dissolving sulfoacid polymer, 2-acrylamide-2-methyl propane sulfonic acid, ethylene glycol dimethacrylate and diphenyl ketone into polar solvent, heating the obtained solution at certain temperature so as to volatilize the solvent to obtain gel state membrane when a certain content of residual solvent is left, irradiating the obtained gel state membrane by an ultraviolet lamp for a certain time, soaking by dilute sulphuric acid and water so as to remove all left solvent, converting all sulfoacid group in the membrane into acid so as to obtain the semi-ipn proton exchange membrane. The proton exchange membrane material prepared by the method has high proton conductivity, low methanol permeability and reliable dimensional stability, and can be used in direct-methanol fuel cells.

Description

technical field [0001] The invention belongs to the field of membrane science, in particular to a semi-interpenetrating network structure proton exchange membrane and a preparation method thereof. Background technique [0002] The proton exchange membrane is one of the most critical components of the direct methanol fuel cell. It not only provides a channel for the conduction of protons, but also prevents the permeation and diffusion of methanol as much as possible, and plays the role of separating the cathode and anode of the battery. Its performance is directly related to affect the overall performance of the fuel cell. The Nafion series products of DuPont in the United States are currently the commercialized proton exchange membranes with the best overall performance and the most widely used. Nafion series products have high proton conductivity, excellent mechanical properties, good chemical and electrochemical stability and long-lasting service life, but when they are a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J3/28C08J3/24C08F120/58H01M8/02H01M8/1041H01M8/1069
CPCY02E60/50
Inventor 林俊史珍珍于露侯旭亮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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