화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.19, No.11, 1142-1150, November, 2011
DOI10.1007/s13233-011-1101-8  Export Citation
Synthesis and Characterization of Well Defined Polysulfone-g-Poly(styrenesulfonic acid) Graft Copolymers for Proton Exchange Membrane
Sang Hun Kim, and Chang Gi Cho†
  • Department of Organic & Nano Engineering, Hanyang University, Seoul, 133-791, Korea
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A series of amorphous graft copolymers of polysulfone-g-poly(styrenesulfonic acid) (PSF-g-PSSA) with well-defined structures was prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization. Graft copolymers of three different graft densities, i.e., 8, 5.5, and 3 grafts per chain, with three different degrees of polymerization (DP) of PSSA for each graft density were prepared. The obtained copolymers were transformed into proton exchange membranes, and well-separated simple two phase morphology was targeted in their hydrated states. They were characterized based on water uptake, ion exchange capacity (IEC), proton conductivity, and thermal stability. Water uptake increased as the wt% of the ionic graft or IEC increased. For a similar value of IEC, the water uptake for the graft copolymer decreased with higher graft density. The proton conductivities of the graft membranes were in the range of 2.1×10^(-3) to 1.36×10^(-1) S/cm. Proton conductivity increased as the IEC increased. However, when the wt% of PSSA was lower than 20%, very low proton conductivities were observed.
Keywords:proton exchange membrane;polysulfone;poly(styrenesulfonic acid);RAFT polymerization.
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