Title
Preparation of poly(vinyl phosphate-b-styrene) copolymers and its blend with PPO as proton exchange membrane for DMFC applications
Energy Technology Data Exchange (ETDEWEB)
Author
Li, Guang Hua; Cho, Chang Gi [Center for Advanced Functional Polymers, Department of Fiber and Polymer Engineering, Hanyang University (Korea, Republic of); Lee, Chang Hyun; Lee, Young Moo [Department of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791 (Korea, Republic of)
Published Date
2006-04-15
Abstract
Poly(vinyl phosphate-b-styrene) (poly(VPP-b-St)) block copolymers were prepared via consecutive telomerization of vinyl acetate (VAc), atom transfer radical polymerization (ATRP) with styrene, saponification, and phosphorylation with phosphorus oxychloride. The resulting block copolymers were characterized by FT-IR and pH titration. Then, the block copolymers were blended with poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) to prepare direct methanol fuel cell (DMFC) membrane. The performance of poly(VPP-b-St)/PPO blendmembranes was measured in terms of proton conductivity, methanol permeability, thermal and hydrolytic stability. The proton conductivities were in the range of 10{sup -4} to 10{sup -2} S/cm (60C, RH=95%); the methanol permeabilities were in the range of 4.14x10{sup -8} to 9.62x10{sup -8} cm{sup 2}/s (25C), and quite lower than that of Nafion(R) 117. Also, the thermal stability of the blend membranes was characterized by TGA, and was stable up to 400C; the blend membranes had better hydrolytic stability. (author)
For further details log on website :
https://www.etde.org/etdeweb/details.jsp?query_id=1&page=0&osti_id=20846235
Preparation of poly(vinyl phosphate-b-styrene) copolymers and its blend with PPO as proton exchange membrane for DMFC applications
Energy Technology Data Exchange (ETDEWEB)
Author
Li, Guang Hua; Cho, Chang Gi [Center for Advanced Functional Polymers, Department of Fiber and Polymer Engineering, Hanyang University (Korea, Republic of); Lee, Chang Hyun; Lee, Young Moo [Department of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791 (Korea, Republic of)
Published Date
2006-04-15
Abstract
Poly(vinyl phosphate-b-styrene) (poly(VPP-b-St)) block copolymers were prepared via consecutive telomerization of vinyl acetate (VAc), atom transfer radical polymerization (ATRP) with styrene, saponification, and phosphorylation with phosphorus oxychloride. The resulting block copolymers were characterized by FT-IR and pH titration. Then, the block copolymers were blended with poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) to prepare direct methanol fuel cell (DMFC) membrane. The performance of poly(VPP-b-St)/PPO blendmembranes was measured in terms of proton conductivity, methanol permeability, thermal and hydrolytic stability. The proton conductivities were in the range of 10{sup -4} to 10{sup -2} S/cm (60C, RH=95%); the methanol permeabilities were in the range of 4.14x10{sup -8} to 9.62x10{sup -8} cm{sup 2}/s (25C), and quite lower than that of Nafion(R) 117. Also, the thermal stability of the blend membranes was characterized by TGA, and was stable up to 400C; the blend membranes had better hydrolytic stability. (author)
For further details log on website :
https://www.etde.org/etdeweb/details.jsp?query_id=1&page=0&osti_id=20846235
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