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Received March 11, 2008
Accepted September 22, 2008
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Synthesis and characterization of poly(ether sulfone) grafted poly(styrene sulfonic acid) for proton conducting membranes
Department of Chemical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
Korean Journal of Chemical Engineering, March 2009, 26(2), 518-522(5), 10.1007/s11814-009-0088-8
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Abstract
Two-step synthesis of proton-conducting poly(ether sulfone) (PES) graft copolymer electrolyte membrane is proposed. Fridel Craft alkylation reaction was used to introduce chloromethyl pendant group onto the PES polymer backbone. Later on, atom transfer radical polymerization (ATRP) was applied to synthesize a series of poly(ether sulfone) grafted poly(styrene sulfonic acid) (PES-g-PSSA). Successful chloromethyl substitution and grafting of the pendant group was characterized by the 1H-NMR and elemental analysis. Electrochemical properties such as ion exchange capacity (IEC), water uptake and proton conductivity increased with increasing PSSA contents. Thermal gravimetric analysis (TGA) showed the thermal stability of membranes up to 270 ℃. Proton conductivity for maximum amount of grafting was 0.00297 S/cm.
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References
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Zschocke P, Quellmalz D, J. Membr. Sci., 22, 325 (1985)
Nohay A, Robeson LM, J. Appl Polym. Sci., 20, 1885 (1976)
Ueda M, Toyota H, Ochi T, Sugiyama J, Yonetaka K, Masuko T, Teramoto T, J. Polym. Sci., Polym. Chem. Ed., 31, 85 (1993)
Wang F, Ji Q, Harrison W, Mecham J, Formato R, Kovar R, Osenar P, McGrath JE, Polym. Preprints, 40, 237 (2000)
Im SJ, Patel R, Shin SJ, Kim JH, Min BR, Korean J. Chem. Eng., 25(4), 732 (2008)
Ding JF, Chuy C, Holdcroft S, Macromolecules, 35(4), 1348 (2002)
Okamura H, Takatori Y, Tsunooka M, Shirai M, Polymer, 43(11), 3155 (2002)
Iddon PD, Robinson KL, Armes SP, Polymer, 45(3), 759 (2004)
Cho CG, Jang HY, You YG, Li GH, Guk S, High Performance Polymers, 18, 579 (2006)
Matyjaszewski K, Xia JH, Chem. Rev., 101(9), 2921 (2001)
Avram E, Brebu MA, Warshawsky A, Vasile C, Polymer Degradation and Stability, 69, 175 (2000)
