Preparation of inorganic-organic hybrid proton exchange membrane with chemically bound hydroxyethane diphosphonic acid

• Published in: Journal of applied polymer science Vol. 126; no. 3; pp. 954 - 959
• Main Authors: Shen, Chunhui, Guo, Zhihan, Chen, Cheng, Gao, Shanjun
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.11.2012; Wiley; Wiley Subscription Services, Inc
• Subjects: anhydrous proton conductivity; Applied sciences; Composites; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Exchange resins and membranes; Forms of application and semi-finished materials; Fourier transforms; Fuel cells; Hydroxyethane diphosphonic acid; inorganic-organic hybrid; Leaching; Materials science; Membranes; phosphonic acid; Phosphonic acids; Polymer industry, paints, wood; Polymers; Reproduction; Rings (mathematics); Sol gel process; Technology of polymers; anhydrous proton conductivity; Phosphorus copolymer; Electrical properties; phosphonic acid; Hybrid material; inorganic-organic hybrid; Phosphonic acids; Ether copolymer; sol-gel process; Experimental study; Silica; Composite material; Thermal stability; Crosslinked copolymer; Thermal properties; Sol gel process; Preparation; Epoxide; Cation exchange membrane; Proton conductivity; Proton exchange membrane fuel cells; Siloxane copolymer
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.36972

Proton‐conductive inorganic–organic hybrid intermediate‐temperature membranes were prepared from 3‐glycidoxypropyltrimethoxysilane (GPTMS) and 1‐hydroxyethane‐1,1‐diphosphonic acid (HEDPA) by sol–gel process. To prevent the leaching out of phosphonic acid, triethylamine was used as catalyst to promote the reaction of HEDPA and GPTMS to immobilize phosphonic acid groups. Fourier transform infrared spectra revealed that phosphonic acid groups of HEDPA were chemically bounded to organosiloxane network as a result of the reaction of POH of HEDPA and epoxy ring of GPTMS. TG‐DSC results indicated that the hybrid membranes were thermally stable up to 250°C. The proton conductivity of the hybrid membranes increased with temperature from 30 to 130°C. The proton conductivity of hybrid membrane with the molar ratio of GPTMS/HEDPA = 2/1 can reach up to 1.0 × 10−3 S/cm under anhydrous condition at 130°C, which reveals that this membrane is a promising proton exchange membrane for intermediate‐temperature proton exchange membrane fuel cell. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012