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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 |
Files in This Item:
File | Description | Size | Format | |
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Art-02_Clascidia_AFurtado.pdf | 100.88 kB | Adobe PDF | View/Open |
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