A kind of long side chain sebs base alkaline polymer electrolyte membrane and its preparation and application

Abstract

The invention provides a long side chain SEBS-based alkaline polymer electrolyte membrane, a preparation method and applications thereof, wherein the long side chain SEBS-based alkaline polymer electrolyte membrane is prepared by grafting a long side chain polymer material, the grafted long side chain has a positively charged functional group, the positively charged functional group is one or twoselected from quaternary ammonium salt ions, imidazole salt ions, guanidine salt ions and DABCO(1,4-diazabicyclo[2.2.2]octane) ions, and the long side chain is C2-C8 long alkyl chain. According to thepresent invention, SEBS with good mechanical property and good chemical stability is used as the main chain of the long alkyl chain alkaline polymer electrolyte membrane, such that the membrane has good mechanical property, has good chemical stability in the high temperature alkaline environment, and can meet the requirements of the fuel cell working environment; and the large-area membrane can be prepared by simply adjusting the temperature and the pressure through the hot pressing or solvent method, such that the membrane casting process is simple, and the batch production is easily achieved.

Description

technical field [0001] The invention belongs to the field of alkaline polymer electrolyte membrane; the invention also relates to the preparation of an alkaline polymer electrolyte membrane with higher electrical conductivity and better chemical stability. Background technique [0002] A fuel cell is a type of electrochemical reaction device that directly converts chemical energy in fuel (hydrogen, methanol, ethanol, etc.) into electrical energy. Compared with traditional internal combustion engines, fuel cells are not limited by the Carnot cycle, have high energy conversion efficiency, and are environmentally friendly; compared with primary and secondary batteries, fuel cells have high specific capacity, and as long as fuel is continuously supplied, they can continuously and stably output electric energy . Therefore, fuel cells have received extensive attention in recent years. [0003] Alkaline polymer electrolyte membrane fuel cells (APEMFCs) with alkaline polymer membr...

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Problems solved by technology

However, the polystyrene structure in SEBS is reduced, and this structure will lead to a significant decrease in the proportion of functional groups that can be grafted on the SEBS main chain, and there are polyalkane chain segments between polystyrenes, and the distance between polystyrenes increases. resulting in less conductivity of SEBS-based APEMs

[0007] At the same time, the main chain will also cause the degradation of functional groups, resulting in the loss of the ability of APEMs to conduct ions.

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