Solid polymeric electrolytes obtained from modified natural polymers

Agnieszka Pawlicka; G. O. Machado; K. V. Guimaraes; Douglas C. Dragunski

doi:10.1117/12.519675

22 October 2003 Solid polymeric electrolytes obtained from modified natural polymers

Agnieszka Pawlicka, G. O. Machado, K. V. Guimaraes, Douglas C. Dragunski

Proceedings Volume 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics; (2003) https://doi.org/10.1117/12.519675
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

Polysaccharides like starch and cellulose derivatives, hydroxyethylcellulose (HEC) or hydroxypropylcellulose (HPC) were modified to obtain solid polymeric electrolytes. The chemical modifications were performed by the grafting of polymers with poly(ethylene oxide) mono and diisocyanates or JEFFAMINE (Shiff base). The physical modifications were made by the plasticization process of starch and cellulose derivatives with glycerol and ethylene glycol. All the samples obtained from polysaccharides were characterized by X-ray, thermal analysis (DSC) and impedance spectroscopy. The plasticized samples showed low glass transition temperatures (Tg); for HEC the value was about -60°C and for starch it was about -30°C. Tg values for grafted samples were of about -58°C for starch and -7°C for HPC. The low Tg values obtained are important to ensure good ionic conductivity that reached the values of about 10^-5 Scm^-1 for plasticized samples and 10^-6 Scm^-1 for grafted ones at room temperature. The good film forming and ionic conductivity properties of the samples of HEC, HPC and starch are very interesting candidates to be used as solid polymer electrolytes.

Citation Download Citation

Agnieszka Pawlicka, G. O. Machado, K. V. Guimaraes, and Douglas C. Dragunski "Solid polymeric electrolytes obtained from modified natural polymers", Proc. SPIE 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics, (22 October 2003); https://doi.org/10.1117/12.519675

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