Survey on chemical, physical, and thermal prediction behaviors for sequential chemical treatments used to obtain cellulose from Imperata Brasiliensis (2020)
- Authors:
- Autor USP: MASCHIO, LEANDRO JOSÉ - EEL
- Unidade: EEL
- DOI: 10.1007/s10973-019-09221-5
- Assunto: TRATAMENTO TÉRMICO
- Keywords: Imperata Brasiliensis; Tratamento Químico; Simulação Térmica
- Agências de fomento:
- Language: Inglês
- Abstract: The efects of chemical treatment sequences on the chemical, physical, and mainly the thermal properties of Imperata Brasil iensis grass in the process used to obtain cellulose fbers were analyzed. The thermal properties were extensively investigated by a thermogravimetric analysis, and a thermal behavior prediction was carried out using kinetic parameters and simulation. Thermal simulations using statistical tools enable thermal predictions for any material under diferent conditions. However, they are currently not widely reported in the literature for untreated and treated natural fbers. We used an alkaline treat ment and alkaline treatment followed by one, two, or three bleaching steps with hydrogen peroxide (H2O2) (24% v/v). After each chemical treatment, changes in chemical composition due to the removal of amorphous constituents were observed and confrmed by the analysis of properties such as coloration, density, porosity, crystallinity, and thermal decomposition. The alkaline treatment followed by one step of bleaching was the most efective and viable chemical treatment sequence to obtain cellulose. The changes in coloration from dark brown to light yellow were accompanied by increases in real density (65%), crystallinity (69%), and thermal stability (27.4%) upon one step of bleaching. In general, the subsequent bleaching steps provided similar values. The predicted thermal degradation profles were compared with experimental data in order to validate the proposed degradation mechanisms and models. The obtained kinetic parameters adequately described the mass loss histories of the studied natural fbers, even when extremely simplifed kinetic schemes were used. The degradation mechanisms consisted of difusion followed by autocatalytic reactions for all studied fibers.
- Source:
- Título: Journal of thermal analysis and calorimetry
- ISSN: 13886150
- Volume/Número/Paginação/Ano: v.143, p.73-85, 2020
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
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ABNT
BENINI, Kelly Cristina Coelho de Carvalho et al. Survey on chemical, physical, and thermal prediction behaviors for sequential chemical treatments used to obtain cellulose from Imperata Brasiliensis. Journal of thermal analysis and calorimetry, v. 143, p. 73-85, 2020Tradução . . Disponível em: https://doi.org/10.1007/s10973-019-09221-5. Acesso em: 11 nov. 2024. -
APA
Benini, K. C. C. de C., Ornaghi Junior, H. L., PEREIRA, P. H. F., Maschio, L. J., Voorwald, H. J. C., & Cioffi, M. O. H. (2020). Survey on chemical, physical, and thermal prediction behaviors for sequential chemical treatments used to obtain cellulose from Imperata Brasiliensis. Journal of thermal analysis and calorimetry, 143, 73-85. doi:10.1007/s10973-019-09221-5 -
NLM
Benini KCC de C, Ornaghi Junior HL, PEREIRA PHF, Maschio LJ, Voorwald HJC, Cioffi MOH. Survey on chemical, physical, and thermal prediction behaviors for sequential chemical treatments used to obtain cellulose from Imperata Brasiliensis [Internet]. Journal of thermal analysis and calorimetry. 2020 ;143 73-85.[citado 2024 nov. 11 ] Available from: https://doi.org/10.1007/s10973-019-09221-5 -
Vancouver
Benini KCC de C, Ornaghi Junior HL, PEREIRA PHF, Maschio LJ, Voorwald HJC, Cioffi MOH. Survey on chemical, physical, and thermal prediction behaviors for sequential chemical treatments used to obtain cellulose from Imperata Brasiliensis [Internet]. Journal of thermal analysis and calorimetry. 2020 ;143 73-85.[citado 2024 nov. 11 ] Available from: https://doi.org/10.1007/s10973-019-09221-5
Informações sobre o DOI: 10.1007/s10973-019-09221-5 (Fonte: oaDOI API)
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