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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
26/11/2024 |
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Data da última atualização: |
27/11/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BARBOSA, K. T.; SILVA, S. H. F. da; MAGALHAES, W. L. E.; AMICO, S. C.; DELUCIS, R. de A. |
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Afiliação: |
K. T. BARBOSA, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; SILVIA HELENA FUENTES DA SILVA, UNIVERSIDADE FEDERAL DE PELOTAS; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; SANDRO CAMPOS AMICO, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; RAFAEL DE AVILA DELUCIS, UNIVERSIDADE FEDERAL DE PELOTAS. |
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Título: |
Acid-catalyzed Kraft lignin liquefaction for producing polyols and polyurethane foams. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Journal of Wood Chemistry and Technology, v. 44, n. 1, p. 9-21, 2024. |
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ISSN: |
0277-3813 |
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DOI: |
https://doi.org/10.1080/02773813.2024.2303036 |
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Idioma: |
Inglês |
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Conteúdo: |
This study investigates the use of acid-catalyzed lignin liquefaction for the production of polyols and polyurethane foams. The liquefaction process was carried out using a kraft lignin powder following a process similar to the Lignoboost® method, based on a previous study, with catalyst (sulfuric acid) weight contents of 0, 3 and 6wt.% in relation to the lignin. The PU foams were prepared by the free expansion method and analyzed by Fourier transform infrared spectroscopy (FT–IR), thermogravimetry (TG), differential scanning calorimetry (DSC), dynamic-mechanical analysis (DMA), as well as contact angle and apparent density evaluations. The effect of the catalyst concentration on yield, moisture content and molecular weight of the resulting polyols was assessed, and the optimal conditions were obtained for 6wt.%. FT– IR analysis indicated a suitable foam polymerization. The incorporation of an acid catalyst led to a more hydrophilic foam and a rigid cell structure, with thinner and more uniformly sized cells, as well as higher thermal stability and glass transition temperature. |
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Palavras-Chave: |
Acid catalyst; Bio-based polyurethane foam; Lignin-based polyol; Lignoboost. |
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Thesagro: |
Ácido Sulfúrico; Lignina. |
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Thesaurus Nal: |
Lignin; Sulfuric acid. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01977naa a2200289 a 4500
001 2169530
005 2024-11-27
008 2024 bl uuuu u00u1 u #d
022 $a0277-3813
024 7 $ahttps://doi.org/10.1080/02773813.2024.2303036$2DOI
100 1 $aBARBOSA, K. T.
245 $aAcid-catalyzed Kraft lignin liquefaction for producing polyols and polyurethane foams.$h[electronic resource]
260 $c2024
520 $aThis study investigates the use of acid-catalyzed lignin liquefaction for the production of polyols and polyurethane foams. The liquefaction process was carried out using a kraft lignin powder following a process similar to the Lignoboost® method, based on a previous study, with catalyst (sulfuric acid) weight contents of 0, 3 and 6wt.% in relation to the lignin. The PU foams were prepared by the free expansion method and analyzed by Fourier transform infrared spectroscopy (FT–IR), thermogravimetry (TG), differential scanning calorimetry (DSC), dynamic-mechanical analysis (DMA), as well as contact angle and apparent density evaluations. The effect of the catalyst concentration on yield, moisture content and molecular weight of the resulting polyols was assessed, and the optimal conditions were obtained for 6wt.%. FT– IR analysis indicated a suitable foam polymerization. The incorporation of an acid catalyst led to a more hydrophilic foam and a rigid cell structure, with thinner and more uniformly sized cells, as well as higher thermal stability and glass transition temperature.
650 $aLignin
650 $aSulfuric acid
650 $aÁcido Sulfúrico
650 $aLignina
653 $aAcid catalyst
653 $aBio-based polyurethane foam
653 $aLignin-based polyol
653 $aLignoboost
700 1 $aSILVA, S. H. F. da
700 1 $aMAGALHAES, W. L. E.
700 1 $aAMICO, S. C.
700 1 $aDELUCIS, R. de A.
773 $tJournal of Wood Chemistry and Technology$gv. 44, n. 1, p. 9-21, 2024.
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| 1. |  | SILVA, D. D.; CASELA, C. R.; FERREIRA, A. S.; SILVA, V. A.; MARTINS, Z. C.; BORGES, M. H. D.; CASTRO, H. A.; GUIMARAES, F. B. Primeiro relato de Bipolaris sorghicola, agente etiológico da "mancha alvo" em sorgo, no Brasil. In: CONGRESSO NACIONAL DE MILHO E SORGO, 26.; SIMPÓSIO BRASILEIRO SOBRE A LAGARTA-DO-CARTUCHO, SPODOPTERA FRUGIPERDA, 2.; SIMPÓSIO SOBRE COLLETOTRICHUM GRAMINICOLA, 1., 2006, Belo Horizonte. Inovação para sistemas integrados de produção: trabalhos apresentados. [Sete Lagoas]: ABMS, 2006. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 1 | |
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