Chloromethylated polysulfone (CMPSF) was first prepared.On this basis

benzene sulfonate sodium (BSS) groups and benzene sulfonate disodium (BDSS) groups were bonded on the side chains of polysulfone (PSF)

and two series of sulfonated PSFs with side chains

PSF-BSS and PSF-BDSS

were obtained via nucleophilic substitution reactions with sodium 4-hydroxybenzenesulfonate and disodium 1

2-dihydroxybenzene-3

5-disufonate as nucleophilic reagents

respectively.The effects of main factors on the nucleophilic substitution reactions were examined

and the reaction conditions were optimized.In the structures of PSF-BSS and PSF-BDSS

hydrophilic and hydrophobic domains are phase-separated at nanoscale.PSF-BSS and PSF-BDSS were fully characterized by FTIR and 1H-NMR spectra.By casting film

proton exchange membranes were prepared.The basic properties of the proton exchange membranes were determined

and the effects of the two structure factors

the aromaticity of the main chain and the micro-phase separation between hydrophilic and hydrophobic domains

on the properties of the proton exchange membranes were studied.The investigation results show that in the solvent with strong polarity

the nucleophilic substitution reaction between CMPSF and hydroxy-benzenesulfonic acid sodium salt can be carried out smoothly

and PSF-BSS with a sulfonate bonding amount of 2.07 mmol/g and PSF-BDSS sulfonate with a sulfonate bonding amount of 2.11 mmol/g can be get at 100 ℃ for 40 h.The corresponding proton exchange membranes have higher proton conductivity

and for the membrane of PSF-BDSS

the proton conductivities at room temperature and at 80 ℃ are 4.7 10-2 S/cm and 8.1 10-2 S/cm

respectively.The proton exchange membranes have excellent dimensional stability (8.6% and 30% of swelling ratios at room temperature and at 80 ℃

respectively)

and have fine thermal stability and oxidation stability.