Título: | STUDY OF THE EFFECT OF ALKALI METAL ADSORPTION ON THE THERMAL BEHAVIOR OF CELLULOSE UNDER INERT ATMOSPHERE | ||||||||||||
Autor: |
SANDRA ARAUJO FERREIRA |
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Colaborador(es): |
ROGERIO NAVARRO CORREIA DE SIQUEIRA - Orientador EDELINK EFRAIN TINOCO FALERO - Coorientador |
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Catalogação: | 01/ABR/2019 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=37547&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=37547&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.37547 | ||||||||||||
Resumo: | |||||||||||||
Over the last few years, the growing concern about the environment and society s empathy towards sustainable products has instigated the use of cellulose. Cellulose is a biopolymer extensively studied by mankind given it s of renewable quality, it s numerous and because of its chemical and physical qualities that are compatible with a variety of means. For this project, a study of cellulose fibers was held before and after they were submitted to various concentrations of magnesium hydroxide, in its physical state and in solvents of PVA. Magnesium oxide was also present in its calcinated (powdered) form. Contrasting methodologies were applied in order to perfect the process. A thermodynamic evaluation was made to study the reaction processes resulting from the synthesis methodology. The materials were characterized by MEV and DRX. The results of the treatments and the properties of the fibers were evaluated by thermogravimetry and kinetic analysis. The type of process and the concentration of MgO and Mg(OH)2 used in the treatment were influential in the result when it comes to thermal behavior. For the pure cellulose the value of the activation energy was 53,70 kJ/mol and in the case of sample VI the obtained value was 43.64 kJ/mol. The sample VI presented a lower value of Ea when compared to the pure cellulose, this represents a lower energy consumption to occur the thermal degradation of the fiber under inert atmosphere, which suggests a catalytic effect of the magnesium ions adsorbed on the cellulose. All of the samples showed substances and characteristics that differed from them original fiber. More detailed studies became necessary to optimize the process and interfere in a possible industrial application of the treated fibers.
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