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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
13/07/2021 |
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Data da última atualização: |
14/07/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
KERCHE, E. F.; BOCK, D. N.; DELUCIS, R. de A.; MAGALHAES, W. L. E.; AMICO, S. C. |
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Afiliação: |
EDUARDO FISCHER KERCHE, Programa de Pós-Graduação da UFRGS; DYONES NATAN BOCK, Programa de Pós-Graduação da UFRGS; RAFAEL DE AVILA DELUCIS, UFRGS; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; SANDRO CAMPOS AMICO, Programa de Pós-Graduação da UFRGS. |
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Título: |
Micro fibrillated cellulose reinforced bio-based rigid high-density polyurethane foams. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Cellulose, v. 28, n. 7, p. 4313-4326, May 2021. |
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DOI: |
https://doi.org/10.1007/s10570-021-03801-1 |
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Idioma: |
Inglês |
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Conteúdo: |
Rigid polyurethane foams (RPUF) are the most consumed cellular polymer in the world. Biobased polyols are sometimes used as raw material for RPUF but with a detrimental effect on mechanical properties. In this paper, micro fibrillated cellulose (MFC) was used as a reinforcement to enhance the mechanical, thermal and dynamic mechanical properties of bio-based RPUF. A bleached Eucalyptus sp. pulp was dispersed in glycerine and then subjected to mechanical defibrillation to extract the MFC, a route that does not require dispersants or drying, which is advantageous for the MCF incorporation. The RPUF were manufactured in a closed mould in a way to obtain overpacking. The higher the overpacking degree, the higher the apparent density and stiffness of the RPUF. Also, expansion under confinement yielded more rounded polymer cells with decreased anisotropy. The MFC and overpacking acted synergistically, improving strength, stiffness, thermal stability and dynamic mechanical properties of the RPUF. Thermal conductivity of the RPUF, on the other hand, was unaffected by those factors. |
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Palavras-Chave: |
Bio-based polyols; Cellular composite; Celulose nanofibrilada; Micro fibrillated cellulose; Nanocompósito; Poliuretana reforçada; Rigid polyurethane foam; Thermoset polymers. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 01959naa a2200277 a 4500
001 2132932
005 2021-07-14
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s10570-021-03801-1$2DOI
100 1 $aKERCHE, E. F.
245 $aMicro fibrillated cellulose reinforced bio-based rigid high-density polyurethane foams.$h[electronic resource]
260 $c2021
520 $aRigid polyurethane foams (RPUF) are the most consumed cellular polymer in the world. Biobased polyols are sometimes used as raw material for RPUF but with a detrimental effect on mechanical properties. In this paper, micro fibrillated cellulose (MFC) was used as a reinforcement to enhance the mechanical, thermal and dynamic mechanical properties of bio-based RPUF. A bleached Eucalyptus sp. pulp was dispersed in glycerine and then subjected to mechanical defibrillation to extract the MFC, a route that does not require dispersants or drying, which is advantageous for the MCF incorporation. The RPUF were manufactured in a closed mould in a way to obtain overpacking. The higher the overpacking degree, the higher the apparent density and stiffness of the RPUF. Also, expansion under confinement yielded more rounded polymer cells with decreased anisotropy. The MFC and overpacking acted synergistically, improving strength, stiffness, thermal stability and dynamic mechanical properties of the RPUF. Thermal conductivity of the RPUF, on the other hand, was unaffected by those factors.
653 $aBio-based polyols
653 $aCellular composite
653 $aCelulose nanofibrilada
653 $aMicro fibrillated cellulose
653 $aNanocompósito
653 $aPoliuretana reforçada
653 $aRigid polyurethane foam
653 $aThermoset polymers
700 1 $aBOCK, D. N.
700 1 $aDELUCIS, R. de A.
700 1 $aMAGALHAES, W. L. E.
700 1 $aAMICO, S. C.
773 $tCellulose$gv. 28, n. 7, p. 4313-4326, May 2021.
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Registro original: |
Embrapa Florestas (CNPF) |
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