Sulfonated polysulfonamide proton exchange membrane and preparation thereof

Abstract

The invention discloses a sulfonated polysulfoneamide proton exchange membrane and a preparation method thereof. By selecting the new materials of the polysulfoneamide as raw materials, the invention prepares the sulfonated membrane materials. The amide and the sulfonyl group in the PSA molecule are connected with each other on the para phenyl and form a linear macromolecule with the para phenyl; as the strong electro-withdrawing phenyl group exists on the macromolecular chain, the molecular structure is driven to have more excellent heat resistance, thermal stability and thermal oxidation resistance than the traditional acromatic polyamide through the double-bond conjugation of the benzene ring. The mixed acids comprising the concentrated sulfuric acids and oleums are selected as the sulfonating agents, thus lowering material viscosity and helping heat transfer and being beneficial to uniform and complete implementation of the sulfonation and reducing occurrence of the side reaction. The high activity of the oleums is helpful for enhancing the sulfonation degree of the sulfonated bodies. The introduction of the sulfonic group (-SO3H) in the main-chain structure of the polymer can remarkably enhance the proton conductivity and water content of the polymers. The invention has the advantages that the invention provides a proton exchange membrane which endures high temperature, has stable chemical performance, high proton conductivity, excellenet antioxidation property and thermal stability, etc., and has low cost and is suitale for fuel cells, and also can be used as various ultrafiltration membranes, nanofiltration membranes or reverse osmosis membranes and has wide application prospect.

Description

technical field [0001] The invention belongs to the field of polymer material science, and in particular relates to a sulfonated polyphenylsulfone terephthalamide proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells have the advantages of low operating temperature, fast start-up, high specific power, simple structure, convenient operation, no noise, zero pollution, etc. It is the preferred energy source for civil and military portable power sources such as communication power sources, various emergency power sources, and robot power sources, as well as electric vehicles and fixed power stations. A proton exchange membrane fuel cell consists of an anode, a cathode, a catalyst, and a proton exchange membrane. The proton exchange membrane is the "heart" of the proton exchange membrane fuel cell. Its role in the fuel cell is two-fold: one is to provide a channel for the migration and transport of protons as...

AI Technical Summary

Problems solved by technology

At present, most proton exchange membrane fuel cells (PEMFC) use Nafion membrane, but the membrane still has the following disadvantages: (1) It is difficult to manufacture and the cost is high. The current market price of Nafion membrane is 1000 US dollars / m 2 , the synthesis and sulfonation of perfluorinated substances are very difficult, and the hydrolysis and sulfonation in the film-forming process are easy to denature and degrade the polymer, making film formation difficult; (2) high temperature and water content requirements, Nafion series The optimum working temperature of the membrane is 70-90°C. Exceeding this temperature will cause its water content to drop sharply, and its conductivity will drop rapidly, which hinders the problem of increasing the electrode reaction speed and overcoming catalyst poisoning by appropriately increasing the working temperature; (3) Some hydrocarbons, such as methanol, have a high permeability, and the permeated methanol is oxidized on the cathode, which not only causes the cathode to generate a mixed potential, but also poisons the cathode Pt catalyst, resulting in a decrease in battery performance, so it is not suitable for direct methanol Proton Exchange Membranes for Fuel Cells (DMFC)

At present, there is no report on its sulfonation modification at home and abroad.

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