Data/hora: 02/06/2024 13:05:35

Biblioteca(s): | Embrapa Florestas.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 1
Data corrente: | 13/05/2019
Data da última atualização: | 30/10/2019
Autoria: | CLARO, F. C.; MATOS, M. de; JORDÃO, C.; AVELINO, F.; LOMONACO, D.; MAGALHAES, W. L. E.
Afiliação: | Francine Ceccon Claro, Doutoranda da UFPR; Mailson de Matos, Doutorando da UFPR; Caroline Jordão, Mestranda da UFPR; Francisco Avelino, Instituto Federal de Educação, Ciência e Tecnologia do Ceará; Diego Lomonaco, Universidade Federal do Ceará; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF.
Título: | Enhanced microfibrillated cellulose-based film by controlling the hemicellulose content and MFC rheology.
Ano de publicação: | 2019
Fonte/Imprenta: | Carbohydrate Polymers, v. 218, p. 307-314, Aug. 2019.
DOI: | 10.1016/j.carbpol.2019.04.089
Idioma: | Inglês
Conteúdo: | Understanding of how hemicellulose acts on the rheology of microfibrillated cellulose in suspension or after drying is insufficient. In this study, different concentrations of hemicellulose in the cellulose pulp of Eucalyptus sp. were obtained by alkaline treatment with potassium hydroxide. The treated pulps and the suspension of microfibrils obtained were characterized by thermogravimetric analysis, zeta potential, scanning electron microscopy, rheological analysis, X-ray diffraction and dynamic mechanical analysis. The lowest hemicellulose content obtained was approximately 2% wt. Treatments with KOH above 10% did not cause a significant reduction in hemicellulose content and caused a change in the type of cellulose crystallinity. The rheological analysis showed that the apparent viscosity of the suspensions was strongly influenced by the presence of hemicellulose. The morphology of the MFC films of the treated pulps presented the appearance of voids with the reduction of hemicellulose content, generating a decrease in its mechanical properties.
Palavras-Chave: | Alkaline treatments; Cristalinidade; Crystallinity; Nanocellulose; Nanocelulose; Tratamento alcalino.
Thesagro: | Hemicelulose; Propriedade Mecânica; Propriedade Reológica.
Thesaurus Nal: | Hemicellulose; Mechanical properties; Rheological properties.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (56804-1) - UPC - AP - DD -  -  -  - DIS