Synthesis of proton conductive inorganic–organic hybrid membranes through copolymerization of dimethylethoxyvinylsilane with vinylphosphonic acid |
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Authors: | Hiroshi Onizuka Masaki Kato Tetsuo Shimura Wataru Sakamoto Toshinobu Yogo |
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Institution: | (1) Division of Nano-Materials Science, EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya Aichi, 464-8603, Japan;(2) Research and Development Division, Aichi Industrial Technology Institute, Nishi-shinwari, Hitotsugi-cho, Kariya Aichi, 448-0003, Japan |
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Abstract: | Proton conductive inorganic–organic hybrid membranes were synthesized from dimethylethoxyvinylsilane (DMEVS), vinylphosphonic
acid (VPA) and 3-glycidoxypropyltrimethoxysilane (GPTMS) through copolymerization followed by sol–gel process. The ratio of
phosphorus to silicon in the copolymer almost corresponded to the charged molar ratio of VPA to DMEVS when the ratio of VPA
to DMEVS was below 1/2. Self-standing, homogeneous, highly transparent membranes were synthesized from DMEVS–VPA copolymer
and GPTMS via sol–gel condensation. Differential thermal analysis-thermogravimetry analyses indicated that these membranes
were thermally stable up to 200 °C. The results of Fourier transform infrared and 13C NMR revealed that phosphonic acid groups of VPA were chemically bound to organosiloxane network. The copolymerization and
condensation of (DMEVS–VPA)/GPTMS were confirmed by 31P and 29Si NMR spectra. The proton conductivity of the hybrid membranes increased with phosphonic acid content. The membrane of (DMEVS–VPA)/GPTMS
showed a remarkable conductivity of 6.3 × 10−2 S cm−1 at 130 °C and 100% relative humidity. |
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Keywords: | Inorganic– organic hybrid Copolymerization Sol– gel process Proton conductive membrane |
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