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

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...

Examples

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.

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...

Examples

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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