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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/65922
Título: 
Investigation of New Ion Conducting Ormolytes Silica-Polypropyleneglycol
Autor(es): 
Instituição: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Université Paris-Sud
ISSN: 
0928-0707
Resumo: 
Two groups of hybrid organic-inorganic composites exhibiting ionic conduction properties, so called ORMOLYTES (organically modified electrolytes), have been prepared by the sol-gel process. The first group has been prepared from mixture of a lithium salt and 3-isocyanatopropyltriethoxysilane(IsoTrEOS),O,O′-bis(2-aminopropyl) polypropyleneglycol. These materials produce chemical bonds between the organic (polymer) and the inorganic (silica) phases. The second group has been prepared by an ultrasonic method from a mixture of tetraethoxysilane (TEOS), polypropyleneglycol and a lithium salt. The organic and inorganic phases are not chemically bonded in these samples. The Li+ ionic conductivity, σ, of all these materials has been studied by AC impedance spectroscopy up to 100°C. Values of σ up to 10-6 Ω-1·cm-1 have been found at room temperature. A systematic study of the effects of lithium concentration, polymer chain length and the polymer to silica weight ratio on σ shows that there is a strong dependence of σ on the preparation conditions. The dynamic properties of the Li+ ion and the polymer chains as a function of temperature between -100 and 120°C were studied using 7Li solid-state NMR measurements. The ionic conductivity of both families are compared and particular attention is paid to the nature of the bonds between the organic and inorganic components.
Data de publicação: 
1-Dez-1999
Citação: 
Journal of Sol-Gel Science and Technology, v. 13, n. 1-3, p. 909-913, 1999.
Duração: 
909-913
Palavras-chaves: 
  • Hybrid material
  • Ionic conductor
  • Silica-polypropyleneglycol
  • Solid electrolyte
  • Chemical bonds
  • Ionic conduction in solids
  • Lithium
  • Nuclear magnetic resonance
  • Polyethers
  • Silica
  • Sol-gels
  • Solid electrolytes
  • Spectroscopic analysis
  • Concentration (process)
  • Inorganic compounds
  • Ionic conduction
  • Organic compounds
  • Polymers
  • Thermal effects
  • Organically modified electrolytes
  • Polypropylene glycols
  • Hybrid materials
  • Ionic conductors
  • Lithium salts
  • Polyelectrolytes
  • Ions
Fonte: 
http://dx.doi.org/10.1023/A:1008627424438
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/65922
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