Preparation And Properties Of Composite Proton Exchange Membranes Of Sulfonated Polyaryl Ether Ketone Sulfone/MOFs

The progress of human civilization is inseparable from the consumption of existing energy and development of new energy.Currently,the contradiction between exhaustion of traditional fossil energy,shortage of new energy capacity,high cost,and harsh conditions of usage is becoming increasingly prominent,and the energy problem has become an obstacle to social development.Therefore,the development and application of a renewable,clean and efficient new energy has become the focus of industry and academia around the world.As a new kind of clean energy,hydrogen energy has entered our field of vision with its inexhaustible characteristics.Fuel cell is a new energy technology using hydrogen energy,with polymer electrolyte membrane?PEMs?at its core,which has the function of transferring ions and isolating fuel and oxidant.In this paper,several groups of composite films with inorganic particles were prepared and characterized by a simple method.At present,the excellent performance of non-fluorine aromatic proton exchange membrane has made it one of the most promising alternative proton exchange membrane materials.The sulfonated polyaryl ether ketone sulfone membrane material is also considered to be one of the most promising new membrane materials,which has excellent physical mechanical performance and thermal stability.However,under medium and high temperature,the mechanical properties of high IEC sulfonated aromatic PEMs are poor and becomes susceptible to swelling,which will directly lead to unacceptable low-dimensional stability.Therefore,it is very important to rationally modify the sulfonated polyaryl ether ketone sulfone membrane materials to improve their comprehensive performance.MOF is a metal-organic substance that has been studied in recent years.Generally,these compounds have large specific surface area,pore structure and excellent physical and chemical properties.In this paper,a quaternary SPAEK polymer was prepared,and then two different MOF particles were synthesized:ZIF-67 and UIO-66-NH₂.Several sets of composite membranes were prepared by ultrasound and physical mixing,this is followed by characterization of FTIR,XRD,SEM,TG,IEC,water swelling rate,mechanical properties and proton conductivity.In the third chapter,ZIF-67 particles were prepared.The preparation method is simple.The composite of ZIF-67 and SPAEK has good thermodynamic and chemical stability,and there is no obvious phase separation.When the mass ratio of ZIF-67 and SPAEK is 1:100,the proton conductivity of SPAEK-6F-Z1composite membrane reaches 0.07S cm^-1 at 90?.In the fourth chapter of this paper,UIO-66-NH₂ particles were selected to study the properties of composite membranes prepared with polymers.The results show that when the sulfonation degree of the SPAEK membrane is 80%and the mass ratio of UIO-66-NH₂and SPAEK is 2:100,the SPAEK-6F-U2 composite membrane has the most optimal conductivity in this series at 90?.The proton conductivity is about 0.118 S cm^-1 which is higher than of pure SPAEK membrane at 0.061 S cm^-1.And this series of composite membranes have good mechanical properties,the elongation at break of SPAEK-6F-U1reached 89.63 Mpa;meanwhile,the average swelling ratio of the composite membranes is low?<12%?and have extremely high oxidation stability?>97%?.