Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/5488

TitleStudy of sol-gel derived di-ureasils doped with zinc triflate
Author(s)Nunes, Sílvia
Zea Bermudez, V. de
Silva, Maria Manuela
Smith, Michael John
Morales, Enrique
Ferreira, R. A. Sá
Carlos, Luís
Rocha, João
KeywordsIonic conductivity
POE/siloxane
Di-ureasils
Zinc triflate
Issue date1-Sep-2006
PublisherElsevier Science BV
JournalSolid State Sciences
Abstract(s)Zinc triflate (Zn(CF3SO3)2)-doped sol-gel derived di-urea cross-linked POE/siloxane ormolytes (designated as di-ureasils) with ∞ > n ≥ 1 (where the salt content is expressed as n, the molar ratio of oxyethylene moieties to Zn2+ ions) were investigated. The hybrids with n ≥ 5 are entirely amorphous; those with n > 10 are thermally stable up to approximately 305 ºC. The siliceous network of representative samples (n = 200 and 10) is essentially composed of (SiO)3Si(CH2)- environments and is thus highly branched. The distance between the structural units in samples with 200 ≥ n ≥ 10 and n ≤ 7 is 4.2 and 4.3 Å, respectively. The estimated interdomain distance is 11 and 13 Å for xerogels with 200 ≥ n ≥ 20 and n ≤ 10, respectively. At n = 1 a crystalline POE/Zn(CF3SO3)2 complex of unknown stoichiometry is formed. The conductivity maxima are located at n = 60 (3x10-6 S cm-1) and n = 20 (7x10-5 S cm-1) at 30 and 100 ºC, respectively.
TypeArticle
DescriptionProva tipográfica (In Press)
A publicar em "Solid States Sciences".
URIhttp://hdl.handle.net/1822/5488
DOI10.1016/j.solidstatesciences.2006.07.013
ISSN1293-2558
AccessOpen access
Appears in Collections:CDQuim - Artigos (Papers)

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