Structure,thermal properties,conductivity and electrochemical stability of di-urethanesil hybrids doped with LiCF3SO3 |
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Authors: | M.?Cristina?Gon?alves Verónica?de?Zea Bermudez M.?M.?Silva M.?J.?Smith Enrique?Morales Rute?A.?Sá Ferreira Luís?D.?Carlos |
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Affiliation: | 1.Departamento de Química/CQ-VR,Universidade de Trás-os-Montes e Alto Douro,Vila Real,Portugal;2.Departamento de Química,Universidade do Minho, Gualtar,Braga,Portugal;3.Instituto de Ciencia y Tecnología de Polímeros del CSIC,Calle Juan de la Cierva 3,Madrid,Spain;4.Departamento de Física/CICECO,Universidade de Aveiro,Aveiro,Portugal |
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Abstract: | 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 chains with approximately 6 and 13 (OCH2CH2) repeat units, respectively. All the samples studied, with compositions ∞ > n ≥ 1 (where n is the molar ratio of (OCH2CH2) repeat units per Li+), are entirely amorphous. The di-urethanesils are thermally stable up to at least 200 °C. At room temperature the conductivity maxima of the d-Ut(300)- and d-Ut(600)-based di-urethanesil families are located at n = 1 (approximately 2.0 × 10−6 and 7.4 × 10−5 Scm−1, respectively). At about 100 °C, both these samples also exhibit the highest conductivity of the two electrolyte systems (approximately 1.6 × 10−4 and 1.0 × 10−3 Scm−1, respectively). The d-Ut(600)-based xerogel with n = 1 displays excellent redox stability. |
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