Fluorinated modified sulfonated polyarylether and preparation method and application thereof

Abstract

The invention provides fluorinated modified sulfonated polyarylether as shown by a general formula (1), and simultaneously provides a method for fluorinating and modifying polyarylether and application of the fluorinated modified sulfonated polyarylether in preparing a proton exchange membrane. The invention aims to overcome the defects that the prior proton exchange membrane applied to fuel batteries has a complex synthetic route, a high preparation cost or lower performance. The fluorinated modified sulfonated polyarylether is prepared by drying sulfonated polyarylether and then performing reactions between the sulfonated polyarylether and mixed gas of fluorine gas / nitrogen gas at a temperature of lower than 100 DEG C; and in the application of preparing the proton exchange membrane, the sulfonated polyarylether can be ground into powder and prepared into a thin membrane after fluorinated modification, and then the thin membrane is subjected to acidizing, or the sulfonated polyarylether is prepared into the thin membrane, and then the thin membrane is subjected to acidizing after the fluorinated modification. The thin membrane prepared by the method has good mechanical properties, thermal stability and oxidation stability, and simultaneously the proton exchange rate and the proton conductivity of the membrane are improved; besides, the thin membrane has good dimensional stability and battery performance, and has an extensive application prospect in the field of fuel batteries.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a fluorinated modified sulfonated polyarylether used for preparing a proton exchange membrane of a proton exchange membrane fuel cell, a preparation method and an application thereof. Background technique [0002] As early as 1839, William.Grove had proposed the principle that the reaction of hydrogen and oxygen could generate electricity. The British Mood and Langer repeated Grove's test in 1889 and introduced the name fuel cell. Since the 1980s, due to the increasingly serious energy crisis and environmental pollution, people have paid more attention to efficient and clean energy, which has pushed the research on fuel cells to a climax. [0003] Fuel cells are called "clean energy in the 21st century". It is a high-efficiency power generation device that directly converts the chemical energy of fuel into electrical energy without burning it. Proton exchange membrane fuel ...

AI Technical Summary

Problems solved by technology

[0007] However, the fluorination of sulfonated polymers is currently a major problem in the field

First of all, fluorine-containing monomers are very expensive, such as perfluorobiphenyl (CAS: 434-90-2) and hexafluorobisphenol A (CAS: 1478-61-1); Bisphenol monomer is used as raw material, but its synthetic route is complicated and the yield is also low

In addition, it is a method of surface modification to modify general-purpose plastics and engineering plastics (such as PE, PS, PMMA, PPO, PI, PET, PVA and PU, etc.) by direct fluorination. It can improve the water resistance, isolation, gas separation, and change the adhesion of general-purpose plastics and engineering plastic products, but it is only a surface treatment technology, and the penetration depth of fluorine gas molecules is 0.01-10 microns

Images