Please use this identifier to cite or link to this item: http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/550
Title: Study of correlations between microstructure and conductivity in a thermoplastic polyurethane electrolyte
Title of periodic: Journal of Physical Chemistry B Washington, DC
metadata.dc.title.subtitlejournal: Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
Authors: Furtado, Clascídia Aparecida
Silva, G.G.
Machado, J.C.
Pimenta, M.A.
Silva, R.A.
Affiliation: Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte,MG, Brasil
Issue Date: 1999
Keywords: Plastics;polyurehanes;microstructure;ionic conductivity;raman spectroscopy
Abstract: Micro-Raman and positron annihilation lifetime spectroscopy (PALS) have been used to investigate the structure of a thermoplastic polyurethane/LiClO4 solid flexible polymer electrolyte at room temperature. Correlation between the free volume and carrier concentration with ionic conductivity was observed. The polyurethane soft phase consisted of a poly(tetramethylene glycol-co-ethylene glycol) copolymer reinforced by condensation with hexamethyldiisocianate. The range of salt concentration between 5 and 35 wt percent, which attained the beginning of phase segregation, was also studied by differential scanning calorimetry (DSC), which showed the presence of three thermal events; the soft-phase Tg, a change in heat capacity suggested as the hard-phase Tg, and a hard-phase ordering endotherm. The total ionic conductivity was found to be approximately 4 x 10-6 S cm-1 at 23 oC up to 27 wt percent salt, whereas there were pronounced changes observed by the spectroscopic techniques.
Access: L
Appears in Collections:Artigo de periódico

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