| 초록 |
Well-defined poly(2,6-dimethyl-4,4’-phenylene oxide)-g-poly (styrenesulfonic acid) (PPO-g-PSSA) graft copolymer was synthesized via living radical polymerization. For the graft copolymer, poly(2,6-dimethylphenylene oxide) (PPO) was brominated first, and the brominated PPO was used as a macroinitiator in the atom transfer radical polymerization (ATRP) of styrenesulfonic acid sodium salt. Number of grafts per PPO chain and the molecular weight of the graft were controlled by adjusting degree of bromination, and conversion in ATRP, respectively. Obtained graft copolymers were transformed into proton exchange membranes for direct methanol fuel cell (DMFC) application. The performance of the membranes was measured in terms of water uptake, proton conductivity, methanol permeability, and thermal stability. The water uptake, ion exchange capacity (IEC), proton conductivity, and methanol permeability of the membranes increased with PSSA block content. |
