- Fluorinated aromatic polyether ionomers containing perfluorocyclobutyl as cross-link groups for fuel cell applications
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The cross-linkable copolymers (SHQx-TFVys) with varying degrees of sulfonation (DS) from 70 to 95% were prepared from potassium-2,5- dihydroxybenzenesulfonate (SHQ), decafluorobiphenyl (DFBP), and 4-(trifluorovinyloxy)-biphenyl-2,5-diol (TFVOH) as a cross-linkable moiety. To develop a highly stable polymer electrolyte membrane (PEM) for application in polymer electrolyte fuel cells (PEFC)s, cross-linked membranes were prepared by chemical cross-linking. The cross-linked membranes were synthesized by varying the amount of TFVOH (5-30 mol %) in order to achieve desirable PEM properties. The structures of the cross-linkable monomer and polymers were investigated by 1H and 19F NMR and FT-IR spectra. The cross-linked membranes exhibited good glass transition temperature and thermal stability up to 239-271 °C and 290-312 °C, respectively. The crosslinked membranes (DS range 80-95%) exhibited higher proton conductivity(0.098-0.151 S/cm) than Nafion 212 (0.092 S/cm). Moreover, all membranes possessed lower methanol permeability (13-132 × 10-8 cm2/s) compared with Nafion 212 (163 ×10-8 cm2/s) under the same measurement conditions. The H2/O2 single cell performance tests of the cross-linked membranes and Nafion 212 were performed. The CSHQ90-TFV10 exhibited the higher maximum power density (1.053 W/cm2) than that of Nafion 212 (0.844 W/cm2).
- Lee, Kwan-Soo,Jeong, Myung-Hwan,Kim, Young-Jea,Lee, Su-Bin,Lee, Jae-Suk
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scheme or table
p. 1443 - 1453
(2012/07/28)
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- Synthesis of a new cross-linkable perfluorocyclobutane-based hole-transport material
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(Chemical Equation Presented) A new curable arylamine containing a perfluorocyclobutane (PFCB) structure without an acidic group was synthesized. The material was thermally cured on ITO after spin-coating. The polymer showed excellent solvent resistance,
- Lim, Bogyu,Hwang, Jin-Taek,Jin, Young Kim,Ghim, Jieun,Vak, Doojin,Noh, Yong-Young,Lee, Soo-Hyoung,Lee, Kwanghee,Heeger, Alan J.,Kim, Dong-Yu
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p. 4703 - 4706
(2007/10/03)
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