Preparation And Properties Of Sulfonation Poly (Arylether Ketone Sulfone)containing Amino/Functionalized Titanium Dioxide Composite Membrane

Proton exchange membrane fuel cell(PEMFC)has high power density,energy conversion efficiency,and ease of use.It has become the most promising and environmental friendliness energy conversion equipment.Protons pass through the proton exchange membrane from the anode to the cathode.The anode and the external circuit form a circuit of electron transfer that provides the outside world with current,so its quality directly affects the life of the fuel cell.Therefore,from the above analysis,the proton exchange membrane occupies a very core position in the battery.Its performance can directly affect the life of the whole battery.In the past few years,a series of perfluorinated sulfonic acid membranes called Nafion are widely used in DuPont.This kind of membrane has good proton transport channel and good proton conductivity at low temperature.The chemical stability of its own material is also very good.However,it also has some defects,so it can not be well developed and applied in practice.So researchers modify or find alternatives to Nafion.In this paper,sulfonated poly(aryl ether ketone sulfone)was selected as the matrix material,and some of the raw materials were sulfonated and aminated.In order to increase its water absorption and make the membrane form an idealized hydrophilic-hydrophobic phase separation structure,the organic-inorganic composite membrane was prepared by using inorganic particles as fillers.In order to avoid the dilution of the proton transfer group by inorganic particles,the proton conductivity decreases.The inorganic particles were functionalized.The properties of Am-IL-T composite membrane and Am-T composite membrane were compared.When the particle content is 3%,the proton conductivity of the two composite membranes of Am-IL-T and Am-T are all higher than that of the pure membrane,but the Am-IL-T composite membranei ncreases by 94.67% and the Am-T only increases 12.19%.When the content of proton is higher than 3%,however,because there is no proton functional group,when the content of proton is higher than 3%,the proton conductivity is lower than that of pure membrane.The mechanical properties and oxidation stability of Am-T composite membranes have little change,but the mechanical properties of Am-IL-T composite membranes are decreased because of the consumption of sulfonic groups in the composite membranes,but they do not affect the use of the membranes.In order to further solve the dilution effect caused by the reduction of proton conductivity and chemical bonds and other cross-linking caused by mechanical damage.In this paper,the graft material of 3,4-dihydroxyphenyl-L-alanine,also called levodopa L-dopa,is selected.The surface of the material is rich in amino acid groups,which can interact with the amino group of the matrix and the carboxyl group of the matrix.Finally,the composite membrane was successfully prepared by adjusting the proper proportion of functionalized inorganic particles.By comparison,the proton conductivity of the composite membrane has been improved obviously(L-Am(15%)=0.0879S/cm,Am-SPAEKS=0.0381S/cm,90°C),and the dilution effect mentioned above has not appeared.Another advantage is that the Young modulus of the membrane is increased from 1866.46 MPa to 2270.08 Mpa.The mechanical properties of the membrane are increased rather than decreased.