Sulfonated poly(ether sulfone)s containing pyridine moiety for PEMFC.
Sulfonated poly(ether sulfone)s with varied degree of sulfonation (DS) were prepared via post-sulfonation of synthesized pyridine based poly(ether sulfone) (PPES) using concentrated sulfuric acid as sulfonating agent. The DS was varied with different mole ratio of 4,4'-(2,2-diphenylethenylidene)diphenol, DHTPE in the polymer unit. PPES copolymers were synthesized by direct polycondensation of pyridine unit with bis-(4-fluorophenyl)-sulfone, 4, 4'-sulfonyldiphenol and DHTPE. The structure of the resulting PPES copolymer membranes with different sulfonated units were studied by 1H NMR spectroscopy and thermogravimetric analysis (TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymer with water. The ion exchange capacity (IEC) and proton conductivity were evaluated according to the increase of DS. The water uptake (WU) of the resulting membranes was in the range of 17-58%, compared to that of Nafion 211 28%. The membranes provided proton conductivities of 65-95 mS/cm in contrast to 103 mS/cm of Nafion 211.
Hohyoun
H
Jang
Md Monirul
MM
Islam
Youngdon
Y
Lim
Md Awlad
MA
Hossain
Younggil
Y
Cho
Hyunho
H
Joo
Whangi
W
Kim
Heung-Seok
HS
Jeon
D011211:Electric Power Supplies; D008567:Membranes, Artificial; D019800:Phenol / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011522:Protons; D011725:Pyridines / Q000737:chemistry*; D013450:Sulfones / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry
D008567:Membranes, Artificial; D011108:Polymers; D011522:Protons; D011725:Pyridines; D013450:Sulfones; D014867:Water; C022840:polyether sulfone; D019800:Phenol; C023666:pyridine