Autor(es)

Pereira, R. F. P. ; Donoso, J. P. ; Magon, C. J. ; Silva, I. D. A. ; Cardoso, M. A. ; Goncalves, M. C. ; Sabadini, R. C. ; Pawlicka, A. ; de Zea Bermudez, V. ; Silva, M. M.

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 211, p. 10-pg., 2016-09-01.

Resumo

Amorphous poly(epsilon-caprolactone) (PCL(530))/siloxane ormolytes doped with manganese perchlorate (Mn(ClO4)(2)) (d-PCL(530)/siloxane(n)Mn(ClO4)(2) with n = 20, 50, and 100), thermally stable up to at least 200 degrees C, were synthesized by the sol-gel method. Ionic conductivity values up to 4.8 x 10(-8) and 2.0 x 10(-6) S cm(-1) at about 25 and 100 degrees C, respectively, were obtained for n = 20. FT-IR data demonstrated that the hydrogen bonding interactions present in the non-doped d-PCL(530)/siloxane host hybrid matrix were significantly influenced by the inclusion of Mn(ClO4)(2) which promoted the formation of more oxyethylene/urethane and urethane/urethane aggregates. In addition, the Mn2+ ions bonded to all the "free" C = O groups of the urethane cross-links and to some of the "free" ester groups of the amorphous PCL(530) chains. In the electrolytes, the ClO4- ions were found "free" and bonded to the Mn2+ ions along a bidentate configuration. The magnitude of the electron paramagnetic resonance (EPR) hyperfine constant of the analyzed samples (A approximate to 90 x 10(-4)cm(-1)) suggested that the bonding between Mn2+ ions and the surrounding ligands is moderately ionic. The synthetized d-PCL(530)/siloxanenMn (ClO4)(2) biohybrids have potential application in paramagnetic, photoelectrochemical and electrochromic devices. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/07793-6 - CeRTEV - Centro de Pesquisa, Tecnologia e Educação em Materiais Vítreos
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs