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...

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.

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