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metadata.artigo.dc.title: Options for chemical modification of wastes from a brazilian hardwood species and potential applications
metadata.artigo.dc.creator: Bufalino, Lina
Caixeta, Leandro Afonso
Protásio, Thiago de Paula
Scatolino, Mario Vanoli
Mesquita, Ricardo Gabriel de Almeida
Mendes, Lourival Marin
Tonoli, Gustavo Henrique Denzin
Marconcini, José Manoel
metadata.artigo.dc.subject: Wood - Alkali Treatment
Wood - Bleaching
Wood - Reinforcement
Resíduos vegetais
Madeira - Tratamento alcalino
Madeira - Branqueamento
Madeira - Reforço
metadata.artigo.dc.publisher: Trans Tech Publications Ltd. Dec-2014
metadata.artigo.dc.identifier.citation: BUFALINO, L. et al. Options for chemical modification of wastes from a brazilian hardwood species and potential applications. Key Engineering Materials, Kapellweg, v. 634, p. 321-328, Dec. 2014.
metadata.artigo.dc.description.abstract: Two pathways for chemical modification of wastes from an Amazon hardwood species named Cordia goeldiana were proposed in this work. Variations in reaction time (2 h or 0.5 h) and temperature (80 and 150 °C), besides reaction medium (mechanical stirring or pressurized closed system) were tested for alkali treatment. NaOH at 5% was kept for both conditions. Afterwards, bleaching with H2O2 and NaOH was performed, but reaction conditions were held constant for both pathways. In general, the mild alkali treatment resulted mainly in the removal of extractives and hemicelluloses from the raw sawdust. The onset temperature and crystalline index increased. On the other hand, the use of higher pressure and temperature in alkali treatment at closed system had a remarkable lignin removal and crystalline index increase without changing cellulose polymorphism as the main effects, but thermal stability became lower. Apart from mineral residues removal, bleaching had negligible effects on fiber properties, suggesting that this procedure could be avoided.
metadata.artigo.dc.language: en
Appears in Collections:DCF - Artigos publicados em periódicos

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