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| 2. |  | REGO, S. S.; SANTOS, A. F. dos; SILVA, A. J. C.; BRONDANI, E. E.; NOGUEIRA, A. C. Levantamento de fungos em pirênios de Duranta vestita. Fitopatologia Brasileira, Brasília, v. 32, supl., p. 135, ago. 2007. p| Biblioteca(s): Embrapa Florestas. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
13/05/2019 |
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Data da última atualização: |
30/10/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
CLARO, F. C.; MATOS, M. de; JORDÃO, C.; AVELINO, F.; LOMONACO, D.; MAGALHAES, W. L. E. |
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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. |
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Título: |
Enhanced microfibrillated cellulose-based film by controlling the hemicellulose content and MFC rheology. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Carbohydrate Polymers, v. 218, p. 307-314, Aug. 2019. |
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DOI: |
10.1016/j.carbpol.2019.04.089 |
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Idioma: |
Inglês |
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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. |
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Palavras-Chave: |
Alkaline treatments; Cristalinidade; Crystallinity; Nanocellulose; Nanocelulose; Tratamento alcalino. |
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Thesagro: |
Hemicelulose; Propriedade Mecânica; Propriedade Reológica. |
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Thesaurus NAL: |
Hemicellulose; Mechanical properties; Rheological properties. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02073naa a2200337 a 4500
001 2108999
005 2019-10-30
008 2019 bl uuuu u00u1 u #d
024 7 $a10.1016/j.carbpol.2019.04.089$2DOI
100 1 $aCLARO, F. C.
245 $aEnhanced microfibrillated cellulose-based film by controlling the hemicellulose content and MFC rheology.$h[electronic resource]
260 $c2019
520 $aUnderstanding 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.
650 $aHemicellulose
650 $aMechanical properties
650 $aRheological properties
650 $aHemicelulose
650 $aPropriedade Mecânica
650 $aPropriedade Reológica
653 $aAlkaline treatments
653 $aCristalinidade
653 $aCrystallinity
653 $aNanocellulose
653 $aNanocelulose
653 $aTratamento alcalino
700 1 $aMATOS, M. de
700 1 $aJORDÃO, C.
700 1 $aAVELINO, F.
700 1 $aLOMONACO, D.
700 1 $aMAGALHAES, W. L. E.
773 $tCarbohydrate Polymers$gv. 218, p. 307-314, Aug. 2019.
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