Di-ureasil ormolytes doped with Mg2+ ions : part 1: morphological, thermal and electrochemical properties

Poly(oxyethylene)(POE/siloxane-based materials incorporating magnesium triflate were prepared by the sol-gel process. The host Class II hybrid matrix (di-ureasil) employed was composed of a siliceous framework to which short POE chains were covalently bonded through urea linkages. Ormolytes with sal...

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Detalhes bibliográficos
Autor principal: Nunes, Sílvia (author)
Outros Autores: Zea Bermudez, V. de (author), Silva, Maria Manuela (author), Barros, Sandra Cerqueira (author), Smith, Michael John (author), Morales, Enrique (author), Rocha, João (author), Carlos, Luís (author)
Formato: article
Idioma:eng
Publicado em: 2005
Assuntos:
Di-ureasil
Complex impedance
Cyclic voltammetry
Sol-gel
Magnesium triflate
Science & Technology
Texto completo:http://hdl.handle.net/1822/5163
País:Portugal
Oai:oai:repositorium.sdum.uminho.pt:1822/5163
Descrição
Resumo:Poly(oxyethylene)(POE/siloxane-based materials incorporating magnesium triflate were prepared by the sol-gel process. The host Class II hybrid matrix (di-ureasil) employed was composed of a siliceous framework to which short POE chains were covalently bonded through urea linkages. Ormolytes with salt composition ranging from 500 to 1 were characterised. The nanohybrid with n = 20, thermally stable up to 360ºC, exhibited the highest ionic conductivity. The electrochemical stability of this material was found to span -3 to +2 volts.

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