Eletrólitos poliméricos a partir de amidos de mandioca modificados (catiônico, eterificado e oxidado) / Electrolytes polimerics from modified cassava starches (cationic, etherified and oxidated)

AUTOR(ES)

Aline Cristina Sabadini

DATA DE PUBLICAÇÃO

2007

RESUMO

Natural polymers are very interesting matrix to obtain solid polymeric electrolytes (SPE). The principal advantage comes from its particularly interesting biodegradation properties due to the natural precedence and also very low cost and good physical and chemical properties. These polymers contain heteroatoms in its structure and for this reason can complex protons or lithium ions leading to the ionic conduction. Among different natural polymers, starch-based SPEs show good opto-electrochemical characteristics and can be applied in electrochemical devices. This work presents the results of cassava starch derivatives-based electrolytes, which were characterized by impedance spectroscopy (EIE), thermal analysis (TGA and DSC) and scanning microscopy (SEM).. The SPEs samples were obtained from cationic, eterified and oxidated starches plasticized with glycerol and ethylene glycol and containing lithium salt LiClO4. Different compositions of SPEs i.e. salt and plasticizer quantities were investigated, where it was observed that the ionic conductivity results obtained for these SPEs varied from 10-9 S/cm to 10-4 S/cm at room temperature depending on the sample and increased following Arrhenius or VTF ionic conductivity models. The best results of ionic conductivity values of 1,55.10-3 S/cm were obtained for SPEs oxidized starch plasticized with 30% of ethylene glycol and containing 08 [O]/[Li]. Thermal analysis using thermogravimetry (TGA) was performed in order to observe the change in degradation temperature caused by the changes performed on the samples. Good conductivity results combined with transparency and good adhesion to the electrodes have shown that starch-based SPEs are very promising materials to be used as solid electrolytes in electrochromic devices.

ASSUNTO(S)

eletrólitos poliméricos polímeros naturais modified cassava starches polimerics electrolytes natural polymers amidos de mandioca modificados

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