1215213-40-3Relevant articles and documents
Synthesis and properties of sulfonated copoly(p-phenylene)s containing aliphatic alkyl pendant for fuel cell applications
Seesukphronrarak, Surasak,Ohira, Kayo,Kidena, Koh,Takimoto, Naohiko,Kuroda, Carlos Seiti,Ohira, Akihiro
experimental part, p. 623 - 631 (2011/02/16)
A series of novel copoly(p-phenylene)s (PPs) containing an alkyl pendant were successfully synthesized via Ni(0)-catalyzed coupling polymerization. Sulfonated copolymers (SPPs) were achieved by postsulfonation from concentrated H2SO4. SPPs showed good solubility in polar aprotic solvents and gave flexible, tough, and transparent free-standing films by solvent casting. The ion exchange capacities (IECs) of the membranes ranged from 2.50 to 2.65?meq/g. All SPP membranes displayed proton conductivity similar to or higher than that of Nafion, especially at high relative humidity (>70% RH) (SPP-1: 0.271 Scm-1, SPP-2: 0.284 Scm-1, SPP-3: 0.212?S?cm-1, Nafion: 0.127 Scm-1; at 80?°C and 95% RH). They also exhibited acceptable water uptake in the range of 52-56?vol% at 80?°C with little dimensional change. The gas permeability of the SPP membranes was much lower than that of Nafion 112. Therefore, these materials are promising for fuel cell application.
