Data/hora: 01/06/2024 01:34:28

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 11/11/2019
Data da última atualização: | 10/06/2020
Autoria: | MALUCELLI, L. C.; LOMONACO, D.; CARVALHO FILHO, M. A. S.; MAGALHAES, W. L. E.
Afiliação: | Lucca C. Malucelli, Universidade Posistivo; Diego Lomonaco, Universidade Federal do Ceará; Marco A. S. Carvalho Filho, Universidade Positivo; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF.
Título: | Cellulose triacetate from different sources: modification assessment through thermal and chemical characterization.
Ano de publicação: | 2020
Fonte/Imprenta: | Holzforschung, v. 74, n. 5, p. 505-512, 2020.
DOI: | https://doi.org/10.1515/hf-2019-0035
Idioma: | Inglês
Conteúdo: | Modification techniques have been widely employed to improve cellulose properties, thus increasing the diversity of industrial applications. While wood pulp cellulose is the most common source for industrial production, little has been studied about the effects of the cellulose source and its purity on modification. Therefore, this article investigates the influence of cellulose source (e.g. wood or cotton) on its modification (acetylation), by estimating the obtained degree of substitution (DS) through Fourier-transform infrared (FT-IR), proton nuclear magnetic resonance (1H NMR) and back titration. The intense reduction in samples? crystallinity after acetylation was a result of breakage of inter- and intra-molecular hydrogen bonds, thus confirming acetylation. Although Avicel showed the highest cellulose content and was virtually free of hemicellulose and lignin, this did not affect the acetylation degree, as all samples were successfully triacetylated. The techniques used in this study were ideal for detecting acetylation and estimating the DS, which makes them good tools for modification studies of cellulose derivatives.
Palavras-Chave: | Acetato de celulose; Acetilação; Cellulose derivatives; Derivados de celulose; Esterificação.
Thesaurus Nal: | Acetylation; Cellulose acetate; Esterification.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (57065-1) - UPC - AP - DD -  -  -  - DIS