用于燃料电池质子交换膜材料的磺化聚芳醚酮砜的合成与性能研究

以叔丁基对苯二酚(TBHQ)为双酚单体,1,4-二(4′-氟苯甲酰基)苯,3,3′-二磺酸钠基-4,4′-二氧二苯砜(SDCDPS)为原料,采用亲核缩聚反应,通过调整磺化单体和非磺化单体的比例与叔丁基对苯二酚共聚,合成了一系列具有不同磺化度的聚芳醚酮砜.通过红外光谱(FTIR),TGA,DSC等分析方法对其结构及性能进行了表征.并用TEM对其内部形态进行了研究,建立了结构与性能之间的关系.通过对膜进行综合性能评价发现,磺化度为0.8的磺化聚芳醚酮砜膜的质子传导率在80℃时达到了0.061 S/cm接近了Nafion 117,而且其甲醇渗透系数为3.4×10-7cm2/s远低于Nafion 117,在质子交换膜燃料电池(PEMFC)和直接甲醇燃料(DMFC)电池中表现出了好的应用前景.

STUDY ON SYNTHESIS AND PERFORMANCES OF SULFONATED POLY(ARYLENE ETHER KETONE SULFONE)COPOLYMERS FOR PROTON EXCHANGE MEMBRANES MATERIAL

A series of sulfonated SPEEKKS copolymers with different DS were synthesized by aromatic nucleophilic polycondensation of disodium 3,3′-disulfonate4,4′-dichloro-diphenylsulfone(SDCDPS),tertbutylhydroquione(TBHQ)and 1,4-bi(4′-fluorobenzoyl)benzene.Synthesized sulfonated copolymers were characterized by FTIR,TGA and DSC.Moreover,the microstructure of membranes was investigated by TEM,and the relationship between structure and performance was established.Physical and electrochemical performances of all membranes were studied thoroughly.The results showed that the proton conductivity of SPEEKKS-4 membrane reached 0.061 S/cm,which was close to that of Nafion 117 at 80℃.However,the methanol diffusion of SPEEKKS-4 membranes only reached 3.4×10~(-7) cm~2/s and was much lower than that of Nafion 117.The new membrane displayed good potential in application as proton exchange membranes(PEM) in PEMFC and DMFC.