Nanocomposite Polymer Electrolytes of Sodium Alginate and Montmorillonite Clay |
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| Authors: | Franciani C. Sentanin Willian R. Caliman Rodrigo C. Sabadini Carla C. S. Cavalheiro Rui F. P. Pereira Maria M. Silva Agnieszka Pawlicka |
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| Affiliation: | 1.IQSC, Universidade de São Paulo, Av. Trabalhador Sãocarlense 400, 13566-590 São Carlos-SP, Brazil; (F.C.S.); (W.R.C.); (R.C.S.); (C.C.S.C.);2.Centro de Química e Departamento de Química, Universidade do Minho, Gualtar, 4710-057 Braga, Portugal; (R.F.P.P.); (M.M.S.) |
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| Abstract: | Nanocomposite polymer electrolytes (NPEs) were synthesized using sodium alginate (Alg) and either sodium (SCa-3-Na+)- or lithium (SCa-3-Li+)-modified montmorillonite clays. The samples were characterized by structural, optical, and electrical properties. SCa-3-Na+ and SCa-3-Li+ clays’ X-ray structural analyses revealed peaks at 2θ = 7.2° and 6.7° that corresponded to the interlamellar distances of 12.3 and 12.8 Å, respectively. Alg-based NPEs X-ray diffractograms showed exfoliated structures for samples with low clay percentages. The increase of clay content promoted the formation of intercalated structures. Electrochemical Impedance Spectroscopy revealed that Alg-based NPEs with 5 wt% of SCa-3-Na+ clay presented the highest conductivity of 1.96 × 10−2 S/cm2, and Alg with 10 wt% of SCa-3-Li+ showed conductivity of 1.30 × 10−2 S/cm2, both measured at 70 °C. From UV-Vis spectroscopy, it was possible to infer that increasing concentration of clay promoted a decrease of the samples’ transmittance and, consequently, an increase of their reflectance. |
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| Keywords: | nanocomposites polymer electrolytes clay sodium alginate |
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