The chloromethylated polysulfone (CMPSF) was prepared under relatively mild reaction conditions by using low toxic and non-carcinogenic materials

while ice-bath was innovatively introduced in the experiment. And the response surface methodology (RSM) was used for optimizing the preparation conditions of CMPSF. The results indicate that the highest degree of chloromethylation of polysulfone could reach up to 1.443 mmol·g-1 while the optimum conditions for preparation are as follows:ice-bath temperature 3.3℃

trimethylchlorosilane dosage 15.63 ml

reaction temperature 35℃

solvent amount 500 ml

stirring rate 200 r·min-1

catalyst dosage 1.52 ml

reaction time 40 h. Using the optimized CMPSF

quaternized polysulfone (QAPSF) was synthesized by means of quaternization

and then the polysulfone anion exchange membrane (PSFAEM) was carried out finally. The chemical structure of each product was characterized by FT-IR

1H NMR and XPS. The main membrane performances were also examined. The results reveals that the membrane surface resistance is 1.05 Ω·cm2 and the ion exchange capacity is 1.2 mmol·g-1. The water uptake and swelling degree of the PSFAEM are 0.42 g·g-1 and 25.47% respectively. TGA tests also show that quaternary ammonium groups of PSFAEM won't be shed until the temperature reached 140℃. As shown in this research

the acquired PSFAEM can meet the requirements of practical application.