Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/10987
Title: Síntese, caracterização estrutural e propriedades térmicas do material híbrido poli(metilmetacrilato)/ferroxita: um estudo experimental e teórico
Other Titles: Synthesis, structural characterization and thermal properties of the poly(methylmetacrilate)/feroxyhyte hybrid material: an experimental and theoretical study
Authors: Cunha, Elaine Fontes Ferreira da
Ramalho, Teodorico de Castro
Brito, Angela Dayana Barrera de
Mancini, Daiana Teixeira
Carvalho, Hudson Wallace Pereire de
Ramalho, Teodorico de Castro
Keywords: Material híbrido
Ferroxita
PMMA
Nanocompósitos
Hybrid material
Feroxyhyte
DFT
Radical trapping
Nanocomposites
Issue Date: 1-Apr-2016
Publisher: Universidade Federal de Lavras
Citation: CORRÊA, S. Síntese, caracterização estrutural e propriedades térmicas do material híbrido poli(metilmetacrilato)/ferroxita: um estudo experimental e teórico. 2016. 85 p. Dissertação (Mestrado em Agroquímica)-Universidade Federal de Lavras, Lavras, 2016.
Abstract: Feroxyhyte and polymethylmethacrylate - PMMA nanocomposites were prepared by grafting 3-(trimethoxy-silyl)propyl methacrylate onto the surface of iron oxide particles. We studied two hybrids with 0.5 and 2.5 wt% of feroxyhyte nanoparticles. The FTIR spectrum showed the band that corresponds to covalent bonding between silane monomers and feroxyhyte atoms. The thermal stability of polymethylmethacrylate and feroxyhyte nanocomposites is higher than that of pure PMMA, and it seems to differ from feroxyhyte content. The SEM analysis determine the size of the particle agglomerate considering the morphology of the samples. The theoretical study enabled a better understanding regarding the polymer/iron oxide interaction. The Density Functional Theory-DFT based calculations reinforces the radical trapping mechanism of nanocomposite stabilization, i.e., Fe 3+ species might be able to accept electrons from the organic phase, which decomposes via radical unzipping. The radical scavenge effect delays the weight loss of the polymer.
URI: http://repositorio.ufla.br/jspui/handle/1/10987
Appears in Collections:Agroquímica - Mestrado (Dissertações)



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