Synthesis And Properties Of New Sulfonated Poly(Aryl Ether Ketone)s

The proton-exchange membrane is the core component of proton exchange membrane fuel cells(PEMFC).At present,the only available commercial products of proton exchange membrane are the Nafion series of perflurosulfonic acid membranes from Dupont.But it has three major drawbacks,including low conductivity at low humidity or high temperature, as well as high methanol permeability.Thus new polymer electrolyte membranes for fuel cell are being explored.Special engineering plastics Poly(aryl ether ketone)(PAEK) are of good performance, such as high heat resistance,good mechanical property,good dimentional stability,better hydrolysis stability,excellent electrical property and so on.Sulfonate group can be introduced into the molecular chains of PAEK by sulfonation. The prepared membrane of sulfonated Poly(aryl ether ketone)(SPAEK) have coefficient of conductivity,good thermal stability and high mechanical strength.In this paper,the process of synthesis FPPPO was improved,thus the yield of medium monomer BCPPO was greatly increased.We have successfully prepared SPAEK polymers with different sulfonated degrees by two methods.One is directly sulfonate PAEK,another is directly polymerization of sulfonated monomers.Further we have characterized the structures in detail.The results showed that the method of directly sulfonate PAEK can not controll sulfonated degrees well,directly polymerization of sulfonated monomers is a powerful method to prepare SPAEK polymers,moreover this method can avoid the cross-linking and other side reactions.We have studied the properties of the resulted SPAEK membranes in detail.The properties mainly include mechanical property,ion exchange capacity.