Properties of Multiblock Sulfonated Poly(arylene ether sulfone)s Synthesized by Precise Controllable Post-sulfonation for Proton Exchange Membranes附视频

A series of multiblock sulfonated poly（arylene ether sulfone）s（SPAES） with various block lengths and predictable ion exchange capacity were synthesized from 4,4'-difluorodiphenyl sulfone, 4,4'-dihydrodiphenyl sulfone and 4,4'-biphenol by one-pot and two-pot polymerization. 1H-NMR and FTIR spectra confirmed the structure that sulfonic acid groups were introduced precisely on the poly（arylene ether sulfone）s by post-sulfonation which resulted in controllable sulfonation degree. The proton exchange membranes（PEMs）-based SPAES displayed excellent dimensional, thermal, antioxidant stability, proton conductivity and mechanical properties（maximum tensile stress >35 MPa）.Thermogravimetric analysis indicated the prepared SPAES began to degrade above 310 °C. The effects of polymerization processes, those were,one-pot hydrophobic segment process, one-pot hydrophilic segment process and two-pot process, on the properties of polymers were investigated. The proton conductivity and microphase separation of SPAES PEMs increased in order of those prepared by one-pot hydrophobic segment process, two-pot process and one-pot hydrophilic segment process. The highest conductivities of SPAES synthesized by the above processes under 80 °C and 100% relative humidity were 213（MS4）, 297（MB3） and 360 mS·cm-1（MQ2）, respectively.