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1995
Journal Article
Titel
Inorganic-organic copolymers as solid state ionic conductors with grafted anions
Abstract
Inorganic-organic copolymers (ORMOCERs) are hybrid polymeric materials consisting of interconnected inorganic oxidic (Si, Al, Zr, etc.) components and organic (polyethylene, poly(meth-)acryl-lates, polyethylene oxides, etc.) components. Synthesis is carried out via sol-gel processing in combination with organic crosslinking reactions of reactive functionalized organosilanes. Depending on chemical composition and processing parameters, special properities are available to meet the material requirements of applied technology. To overcome the general problems resulting from anion movement in using salts and acids, alkylsulfone functionalized alkosilanes were cocondensed with reactive polymerizable alkoxysilanes such as 3-methacryloxypropyl- (for uv-initiated polymerization of the organics) and 3-glycidoxypropyl-tri-methoxysilane ( for thermally initiated polymersation). ORMOCER resins containing grafted lithium sulfone groups produce, after final curing of the organics, amorphous membran es with proton conductivities up to 10 -2 Ohm -1 cm -1 at RT are available depending on the content of -SO3h groups and coordinated water. Thermal stability of the amorphous network has been measured up to 180øC.