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Structure, thermal properties, conductivity and electrochemical stability of di...
Gonçalves, M. C.; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael John; Morales, Enrique; Ferreira, R. A. Sá; Carlos, L. D.Variable chain length di-urethane cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks were prepared by application of a sol-gel strategy. These materials, designated as di-urethanesils (represented as d-Ut(Y’), where Y’ indicates the average molecular weight of the polymer segment), were doped with lithium triflate (LiCF3SO3). The two host hybrid matrices used, d-Ut(300) and d-Ut(600), incorporate POE...
Study of sol-gel derived di-ureasils doped with zinc triflate
Nunes, Sílvia; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael John; Morales, Enrique; Ferreira, R. A. Sá; Carlos, Luís; Rocha, JoãoProva tipográfica (In Press) ; A publicar em "Solid States Sciences". ; 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 u...
Di-urea cross-linked poly(oxyethylene)/siloxane ormolytes for lithium batteries
Nunes, Sílvia; Zea Bermudez, V. de; Ostrovskii, David; Silva, Maria Manuela; Barros, Sandra Cerqueira; Smith, Michael John; Carlos, Luís; Rocha, JoãoPoly(oxyethylene)( POE)/siloxane hybrids (di-ureasils) doped with a wide concentration range of lithium triflate were investigated. The host matrix of these materials (d-U(2000)) is a sol-gel derived siliceous network to which POE chains with about 40 repeat units are bonded through urea linkages. Xerogels with n between 500 and 5 (where n is the molar ration of OCH2CH2 repeat units to lithium íons) were obtain...
Di-ureasil ormolytes doped with Mg2+ ions : part 1: morphological, thermal and ...
Nunes, Sílvia; Zea Bermudez, V. de; Silva, Maria Manuela; Barros, Sandra Cerqueira; Smith, Michael John; Morales, Enrique; Rocha, João; Carlos, LuísPoly(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, ...
Sol-gel derived Li+-doped poly(ε-caprolactone)/siloxane biohybrid electrolytes
Nunes, Sílvia; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael John; Morales, Enrique; Carlos, Luís; Ferreira, R. A. Sá; Rocha, JoãoElectrolytes based on a poly(ε-caprolactone) (PCL)/siloxane organic/inorganic host framework doped with lithium triflate (LiCF3SO3) were synthesised through the sol-gel process. In this biohybrid matrix short PCL chains are covalently bonded via urethane linkages to the siliceous network. Samples with salt composition n (molar ratio of PCL repeat units per Li+ ion) ranging from ∞ to 0.5 were investigated. All t...
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