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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
21/02/1995 |
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Data da última atualização: |
21/02/1995 |
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Autoria: |
DUMUNER, B. J.; DORIA, E. L. V.; SILVA JUNIOR, E. C. da; MANFREDI, V. |
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Título: |
Influencia das caracteristicas dos flocos sobre o refino de polpas quimicas |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
O Papel, Sao Paulo, v.54, n.2, p.29-39, 1993 |
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Idioma: |
Português |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00427naa a2200145 a 4500
001 1284625
005 1995-02-21
008 1993 bl uuuu u00u1 u #d
100 1 $aDUMUNER, B. J.
245 $aInfluencia das caracteristicas dos flocos sobre o refino de polpas quimicas
260 $c1993
700 1 $aDORIA, E. L. V.
700 1 $aSILVA JUNIOR, E. C. da
700 1 $aMANFREDI, V.
773 $tO Papel, Sao Paulo$gv.54, n.2, p.29-39, 1993
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Registro original: |
Embrapa Florestas (CNPF) |
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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: |
09/11/2018 |
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Data da última atualização: |
26/07/2019 |
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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: |
MALUCELLI, L. C.; MATOS, M. de; JORDÃO, C.; LACERDA, L. G.; CARVALHO FILHO, M. A. S.; MAGALHAES, W. L. E. |
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Afiliação: |
LUCCA C. Malucelli, Graduate Program in Environmental Management, Universidade Positivo; Mailson de Matos, Graduate Program in Materials and Science Engineering (PIPE), UFPR; Caroline Jordão, Graduate Program in Materials and Science Engineering (PIPE), UFPR; L. G. Lacerda, Graduate Program in Food Engineering, UEPG; M. A. S. Carvalho Filho, Graduate Program in Environmental Management, Universidade Positivo; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
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Título: |
Grinding severity influences the viscosity of cellulose nanofiber (CNF) suspensions and mechanical properties of nanopaper. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Cellulose, v. 25, n. 11, p. 6581-6589, Nov. 2018. |
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DOI: |
10.1007/s10570-018-2031-9 |
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Idioma: |
Inglês |
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Conteúdo: |
The extent of influence of ultrafine grinding on thermal, structural and rheological properties of cellulose nanofibers and mechanical properties of nanopaper was studied. Bleached Eucalyptus Pulp was used as a raw material for nanocellulose preparation where samples were collected every 5 passages (5, 10, 15, 20 and 25 passages) for analysis. TGA curves suggest thermal stability is decreased after 15 passages as surface area increased in homogenized samples. Moreover, intense defibrillation anticipated thermal degradation and gradually reduced cellulose degradation enthalpy in samples, as evidenced by TGA and DSC curves, thus suggesting fibers size reduction. The XRD crystallinity index does not vary with increased grinding. Finally, suspensions viscosity and nanopaper density showed strong influence over the mechanical properties of nanopapers as evidenced by DMA characterization. Increase in defibrillation resulted in fibers with enhanced tensile strain, toughness, and elastic modulus. However, fiber over-grinding affected this improvement, probably reducing electrostatic repulsion between fibers and resulting in less dense nanopapers. |
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Palavras-Chave: |
Defibrillation; Dynamic mechanical analysis; Microfibrilação; Microfibrillation; Nanocellulose; Nanocelulose. |
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Thesagro: |
Viscosidade. |
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Thesaurus NAL: |
Viscosity. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02046naa a2200289 a 4500
001 2099071
005 2019-07-26
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1007/s10570-018-2031-9$2DOI
100 1 $aMALUCELLI, L. C.
245 $aGrinding severity influences the viscosity of cellulose nanofiber (CNF) suspensions and mechanical properties of nanopaper.$h[electronic resource]
260 $c2018
520 $aThe extent of influence of ultrafine grinding on thermal, structural and rheological properties of cellulose nanofibers and mechanical properties of nanopaper was studied. Bleached Eucalyptus Pulp was used as a raw material for nanocellulose preparation where samples were collected every 5 passages (5, 10, 15, 20 and 25 passages) for analysis. TGA curves suggest thermal stability is decreased after 15 passages as surface area increased in homogenized samples. Moreover, intense defibrillation anticipated thermal degradation and gradually reduced cellulose degradation enthalpy in samples, as evidenced by TGA and DSC curves, thus suggesting fibers size reduction. The XRD crystallinity index does not vary with increased grinding. Finally, suspensions viscosity and nanopaper density showed strong influence over the mechanical properties of nanopapers as evidenced by DMA characterization. Increase in defibrillation resulted in fibers with enhanced tensile strain, toughness, and elastic modulus. However, fiber over-grinding affected this improvement, probably reducing electrostatic repulsion between fibers and resulting in less dense nanopapers.
650 $aViscosity
650 $aViscosidade
653 $aDefibrillation
653 $aDynamic mechanical analysis
653 $aMicrofibrilação
653 $aMicrofibrillation
653 $aNanocellulose
653 $aNanocelulose
700 1 $aMATOS, M. de
700 1 $aJORDÃO, C.
700 1 $aLACERDA, L. G.
700 1 $aCARVALHO FILHO, M. A. S.
700 1 $aMAGALHAES, W. L. E.
773 $tCellulose$gv. 25, n. 11, p. 6581-6589, Nov. 2018.
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