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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
18/10/2019 |
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Data da última atualização: |
17/11/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
LOURENÇON, T. V.; ALAKURTII, S.; VIRTANEN, T.; JÄÄSKELÄINEN, A.-S.; LIITIÄ, T.; HUGHES, M.; MAGALHAES, W. L. E.; BOLZON DE MUNIZ, G. I.; TAMMINEN, T. |
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Afiliação: |
Tainise V. Lourençon, Aalto UniversitY; Sami Alakurtti, VTT Technical Research Centre of Finland; Tommi Virtanen, VTT Technical Research Centre of Finland; Anna-Stiina Jääskeläinen, VTT Technical Research Centre of Finland; Tiina Liitiä, VTT Technical Research Centre of Finland; Mark Hughes, Aalto University; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; Graciela I. Bolzon de Muniz, UFPR; Tarja Tamminen, VTT Technical Research Centre of Finland. |
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Título: |
Phenol-formaldehyde resins with suitable bonding strength synthesized from "less-reactive" hardwood lignin fractions. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Holzforschung, v. 74, n. 2, p. 175-183, Feb. 2020. |
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DOI: |
10.1515/hf-2018-0203 |
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Idioma: |
Inglês |
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Conteúdo: |
The substitution of phenol by lignin in phenol-formaldehyde (PF) resins is one of the most promising end uses of lignin valorization. Lignin from grasses and softwood has been the focus of the studies in this field as they present a higher number of theoretical reactive sites for resin synthesis. Herein we examined the composition and chemical reactivity of ?less-reactive? hardwood lignin fractions and their performance in PF resins, synthesized by substituting 50 wt% of the phenol with lignin. Before resin synthesis, the samples were hydroxymethylated and the maximum formaldehyde consumption was recorded. By doing so, we observed that hardwood fractions consumed formaldehyde close to the theoretical calculation, whereas the reference softwood lignin consumed only about ¼ of the theoretical value. In the resin synthesis, we added formaldehyde to the formulation according to the measured maximum formaldehyde consumption. Thus, low values of free formaldehyde in lignin-PF (LPF) resins were achieved (<0.23%). Moreover, the resin bonding strength displayed similar performance irrespective of whether the LPF resins were made with softwood or hardwood lignin (range of 3.4?4.8 N mm?2 at 150°C and 45?480 s of press time). Furthermore, we concluded that hardwood kraft lignins present no disadvantage compared to softwood lignins in PF resin applications, which have significant practical implications. |
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Palavras-Chave: |
Formaldehyde consumption; Formaldeído; Kraft; Phenolic resins; Reactive sites; Resina fenólica; Technical lignin. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02355naa a2200313 a 4500
001 2113225
005 2020-11-17
008 2020 bl uuuu u00u1 u #d
024 7 $a10.1515/hf-2018-0203$2DOI
100 1 $aLOURENÇON, T. V.
245 $aPhenol-formaldehyde resins with suitable bonding strength synthesized from "less-reactive" hardwood lignin fractions.$h[electronic resource]
260 $c2020
520 $aThe substitution of phenol by lignin in phenol-formaldehyde (PF) resins is one of the most promising end uses of lignin valorization. Lignin from grasses and softwood has been the focus of the studies in this field as they present a higher number of theoretical reactive sites for resin synthesis. Herein we examined the composition and chemical reactivity of ?less-reactive? hardwood lignin fractions and their performance in PF resins, synthesized by substituting 50 wt% of the phenol with lignin. Before resin synthesis, the samples were hydroxymethylated and the maximum formaldehyde consumption was recorded. By doing so, we observed that hardwood fractions consumed formaldehyde close to the theoretical calculation, whereas the reference softwood lignin consumed only about ¼ of the theoretical value. In the resin synthesis, we added formaldehyde to the formulation according to the measured maximum formaldehyde consumption. Thus, low values of free formaldehyde in lignin-PF (LPF) resins were achieved (<0.23%). Moreover, the resin bonding strength displayed similar performance irrespective of whether the LPF resins were made with softwood or hardwood lignin (range of 3.4?4.8 N mm?2 at 150°C and 45?480 s of press time). Furthermore, we concluded that hardwood kraft lignins present no disadvantage compared to softwood lignins in PF resin applications, which have significant practical implications.
653 $aFormaldehyde consumption
653 $aFormaldeído
653 $aKraft
653 $aPhenolic resins
653 $aReactive sites
653 $aResina fenólica
653 $aTechnical lignin
700 1 $aALAKURTII, S.
700 1 $aVIRTANEN, T.
700 1 $aJÄÄSKELÄINEN, A.-S.
700 1 $aLIITIÄ, T.
700 1 $aHUGHES, M.
700 1 $aMAGALHAES, W. L. E.
700 1 $aBOLZON DE MUNIZ, G. I.
700 1 $aTAMMINEN, T.
773 $tHolzforschung$gv. 74, n. 2, p. 175-183, Feb. 2020.
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Registro original: |
Embrapa Florestas (CNPF) |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
24/01/2005 |
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Data da última atualização: |
02/12/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
SOUZA, A. V.; PINTO, J. E. B. P.; BERTOLLUCI, S. K. V.; SILVA, F. G.; ARANTES, E. S.; LAMEIRA, O. A. |
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Afiliação: |
ANA V. SOUZA, UFLA; JOSÉ E. B. P. PINTO, UFLA; SUZAN K. V. BERTOLLUCI, UFLA; FABIANO G. SILVA, UFLA; EVALDO S. ARANTES, UFLA; OSMAR ALVES LAMEIRA, CPATU. |
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Título: |
Micropropagação da arnica: uma planta medicinal. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Horticultura Brasileira, v. 20, n. 2, jul. 2002. Suplemento 2. |
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Idioma: |
Português |
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Notas: |
Cópia de trabalho editado em CD-ROM que contém os resumos expandidos do 42º Congresso Brasileiro de Olericultura e 11º Congresso Latino Americano de Horticultura, Uberlândia, 2002. |
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Thesagro: |
Arnica; Cultura de Tecido; Lychnophora Pinaster; Micropropagação. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/102038/1/5453.pdf
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Marc: |
LEADER 00819nam a2200217 a 4500
001 1406316
005 2022-12-02
008 2002 bl uuuu u00u1 u #d
100 1 $aSOUZA, A. V.
245 $aMicropropagação da arnica$buma planta medicinal.$h[electronic resource]
260 $aHorticultura Brasileira, v. 20, n. 2, jul. 2002. Suplemento 2.$c2002
500 $aCópia de trabalho editado em CD-ROM que contém os resumos expandidos do 42º Congresso Brasileiro de Olericultura e 11º Congresso Latino Americano de Horticultura, Uberlândia, 2002.
650 $aArnica
650 $aCultura de Tecido
650 $aLychnophora Pinaster
650 $aMicropropagação
700 1 $aPINTO, J. E. B. P.
700 1 $aBERTOLLUCI, S. K. V.
700 1 $aSILVA, F. G.
700 1 $aARANTES, E. S.
700 1 $aLAMEIRA, O. A.
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