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Doctoral Thesis
DOI
10.11606/T.88.2004.tde-11092007-104457
Document
Author
Full name
Gilmara de Oliveira Machado
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2004
Supervisor
Committee
Pawlicka, Agnieszka Joanna (President)
Gonzalez, Jose Pedro Donoso
Kawano, Yoshio
Oliveira Junior, Osvaldo Novais de
Torresi, Roberto Manuel
Title in Portuguese
Preparação e caracterização de eletrólitos sólidos poliméricos a partir dos derivados de celulose - hidroxietilcelulose e hidroxipropilcelulose
Keywords in Portuguese
Derivados de celulose
Eletrólitos sólidos poliméricos
Plastificação da HEC
Reação de entrecuzamento da HPC
Abstract in Portuguese
Esta tese apresenta os resultados da obtenção de eletrólitos sólidos poliméricos a partir dos derivados de celulose - hidroxipropilcelulose (HPC) e hidroxietilcelulose (HEC), ambas comerciais. Para atingir os objetivos do projeto, os dois derivados passaram por diferentes processos sendo que a HEC foi modificada fisicamente por meio de plastificação com glicerol e HPC foi alterada quimicamente. A transformação química consistiu nas reações de oxidação de grupos hidroxila da HPC em grupos cetona que, em seguida, foram submetidos as reações de enxertia com diamina de poli(óxido de propileno) [Jeffamina] resultando em redes por meio de ligações imina. A adição do sal perclorato de lítio, em diferentes concentrações, na matriz plastificada ou entrecruzada, resultou na obtenção de eletrólitos sólidos poliméricos, todos na forma de filmes. A caracterização destes eletrólitos foi realizada com técnicas básicas de caracterização de materiais como: análises térmicas (DSC, TGA), análise térmica dinâmico-mecânica (DMTA), análises estruturais (raios-X), medidas espectroscópicas (IR, UVNIS), análise elementar, microscopia eletrônica de varredura (SEM), e, como a mais importante, medidas de condutividade iônica utilizando a técnica de espectroscopia de impedância eletroquímica (EIS).
Title in English
Preparation and characterization of solid polymeric electrolytes based on hydroxypropylcellulose and hydroxyethlcellulose
Keywords in English
Cellulose derivatives
Networks of HPC
Plasticization process
Solid polymeric electrolyte
Abstract in English
The present thesis reports the preparation and characterization of new types of solid polymeric electrolytes (SPE) based on cellulose derivatives such as hydroxypropylcellulose (HPC) and hydroxyethylcellulose (HEC), both commercial products. Aiming to reach this purpose both derivatives were subjected to modification processes, where HEC were physically modified by plasticization process with glycerol and HPC were submitted to chemical reactions. The latter ones were promoted by the oxidation of HPC hydroxyl groups and ketone groups and then subjected to grafting with diamine poly(propylene oxide) (Jeffamine), resulting in the imine bond network formation. Different concentrations of lithium salt were added to the plasticized and grafted samples, resulting in solid polymeric electrolytes, all in the film form. The characterization of these samples was performed by thermal analysis (DSC, TGA and DMTA), X-ray diffraction (XDR), scanning electron microscopy (SEM), ultraviolet/visible/near-infrared spectroscopy (UV/Vis/NIR) and, as most important, measured of ionic conductivity using the technique of electrochemical impedance spectroscopy (EIS).
 
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GilmaraMachado.pdf (6.35 Mbytes)
Publishing Date
2007-09-12
 
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