Synthesis And Properties Of Sulfonated Poly(Arylene Ether Ketone) And Blend Sulfonated Poly(Arylene Ether Phosphine Oxide)s For Polymer Electrolyte Fuel Cell

Recently,the aromatic polymer proton exchange membrane has become the research priorities of proton exchange membrane.It has the performance that the traditional perfluorosulfonated membrane can’t achieve,which is the ideal material for the potential replacement of the expensive Nafion membrane.Series of sulfonated poly（arylene ether ketone）（sPEK）and sulfonated poly（arylene ether ketone ketone）（sPEKK）were synthesized via direct polycondensation.Their properties as proton exchange membranes including ion exchange capacity,water uptake,swelling,proton conductivity and oxidative stability were evaluated.It demonstrated that two series of membranes with high sulfonation degree displayed good properties.And sPEK membranes exhibited better overall properties than sPEKK with similar IEC.For example,sPEK-50showed a swelling of 21.3%and proton conductivity of 0.048 S/cm at 80oC.Moreover,it also displayed excellent oxidative stability compared to many other aromatic poly（arylene ether ketone）membranes.As a result,sPEK-50 membrane exhibited good comprehensive performance.A series of new blend membranes consisting of sulfonated poly（arylene ether phosphine oxide）and poly（vinylidene fluoride）（sPEPOF/PVDFx,x representative PVDF’s mass fraction,x%）proton exchange membranes were prepared for proton exchange membranes.The blend system of a series of sPEPOF with PVDF at various weight ratios was studied by XRD,DSC,AFM,NMR and FTIR,and it was manifested that PVDF was introduced into the sPEPOF substrate completely and decentralized regularly.The blend membranes had a good compatibility.The microstructure of blend membranes were analyzed by AFM,and it was shown that the introduction of hydrophobic PVDF in the sPEPOF substrate rendered blend system has better phase separation structure of hydrophilic and hydrophobic reform the macro-performance of them.This article based on water uptake ratio,swelling,oxidative stability,conductivity and the methanol permeability in studies severally.The conclusion is that blend membrane of sPEPOF/PVDF5.0 who has the befitting content of PVDF emerge into smooth performance.The conductivity of sPEPOF/PVDF5.0 is 0.135 S cm^-1 at 80°C,a value exceed the pristine sPEPOF membrane(i.e.,0.124 S cm^-1)and Nafion 117(i.e.,0.114 S cm^-1)under identical conditions respectively.Furthermore,to some extent,the dimensional stability,the oxidative stability and the methanol permeability were all promoted contrast with the pure sPEPOF.It is regarded as a blend proton exchange membrane with excellent combination property.A series of novel sulfonated poly（arylene ether phosphine oxide）s/sulfonated poly（phthalazinone ether phosphine oxide）s（sPEPOF/tsPPEPOx）blend proton exchange membrane were prepared by physical composite,hydrogen bondword between molecular chains or chain itself have been imported and conduct a study on their property.The results indicate that sPEPOF/tsPPEPO7 has the opposite excellent performance.At 80 ^oC,the conductivity of sPEPOF/tsPPEPO7 is 0.171 S cm^-1,the swelling is limited to 11%.Furthermore,the performance of oxidation resistance and methanol permeability of blends were promoted as well.