芘磺酸型磺化聚砜质子交换膜的性能研究

Properties of pyrene sulfonic acid type sulfonated polysulfone proton exchange membrane

利用聚砜(PS)制备氯代酰基化聚砜(CPS),并与8-羟基-1,3,6-芘三磺酸三钠(HBS)小分子试剂通过亲核取代反应制备磺酸基团键合量不同的芘磺酸型磺化聚砜PS-BS。通过流延成膜法制备相应质子交换膜,考察温度对其吸水率、吸水溶胀性、质子传导率等性能的影响。结果表明,由于侧链末端磺酸基团运动能力随温度升高而增强,相应质子膜的性能也随温度升高呈现正增长,其中磺酸键合量为1.51 mmol/g的PS-BS-4膜在25℃和85℃的吸水率分别为29.6%和42.1%,相应的吸水溶胀性仅为9.4%和24.3%,而PS-BS-4膜在85℃的质子传导率达到0.147 S/cm,非常接近商业化Nafion115膜的性能。

Chloroacylated polysulfone(CPS)is prepared from polysulfone(PS),and reacted with 8-hydroxy-1,3,6-pyrene trisulfonate(HBS)small molecule reagent through nucleophilic substitution reaction to prepare pyrene sulfonic acid type sulfonated polysulfone(PS-BS)with different bonding amount of sulfonic acid group.Corresponding proton exchange membrane is prepared from PS-BS via the casting film forming method.The influences of temperature on the basic properties of PS-BS membrane,such as water absorption,water swelling ratio and proton conductivity,are investigated.It is concluded that the motility of side chain terminal sulfonic acid group increases with a rising temperature.Correspondingly,the water absorption,water swelling ratio and proton conductivity of the proton exchange membrane also show a positive increase with rising temperature.The water absorption rate of PS-BS-4 membrane with a sulfonic acid bonding amount of 1.51 mmol·g-1 is 29.6%and 42.1%respectively at 25℃and 85℃,and the corresponding water swelling ratio is only 9.4%and 24.3%,respectively.The proton conductivity of PS-BS-4 membrane reaches 0.147 S·cm-1 at 85℃,which is close to the property of commercial Nafion115 membrane.