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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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| Registros recuperados : 4 | |
| 1. |  | TRINDADE, R. C. P.; SILVA, P. P. da; ARAÚJO-JÚNIOR, J. X. de; LIMA, I. S. de; PAULA, J. E. de; SANT'ANA, A. E. G. Mortality of Plutella xylostella larvae treated with Aspidosperma pyrifolium ethanol extracts. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 43, n. 12, p. 1813-1816, dez. 2008. Notas científicas.
Título em português: Mortalidade de larvas de Plutella xylostella tratadas com extratos etanólicos de Aspidosperma pyrifolium.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 2. | | BROGLIO, S. M. F.; ALEXANDRE, C. L. A.; MICHELETTI, L. B.; TRINDADE, R. C. P.; DIAS, N. da S.; SILVA, A. P. M. da. Toxicidade de extratos aquosos de folha e torta de sementes de nim na mortalidade da lagarta-do-cartucho. In: OLIVEIRA, A. M. de; VASCONCELOS, C. B. e L.; SILVA, J. F. da; MORAIS, M. A.; DIAS, N. da S.; CAMACHO, R. G. V.; ALENCAR, R. D.; PORTO, V. C. N. (Org.). (Org.). Produção orgânica no semiárido. Mossoró: EdUFERSA, 2016. Cap. 76 p. 716-725. (Coleção agroecologia e meio ambiente no Semiárido, v. 3).| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 3. | | SABINO, A. R.; NEGRISOLI JUNIOR, A. S.; SANTOS, S. dos; SILVA, J. F. da; TRINDADE, R. C. P.; DUARTE, A. G. Virulência de heterorhabditis sp. AL44 no controle de rhynchophorus palmarum L., 1764 (COLEOPTERA: CURCULIONIDAE). In: SIMPÓSIO DE CONTROLE BIOLÓGICO, 14., 2015 , Teresópolis, RJ. Siconbiol: [resumos..]. Teresópolis, RJ: Sociedade Entomológica do Brasil, 2015 .| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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| 4. | | MARCUVELE, D. L. P.; FERREIRA, A. M. V.; OLIVEIRA, M. S. G. de; OLIVEIRA, V. do N. L.; TRINDADE, R. C. P.; COSTA, J. G. da; GOULART, H. F.; SANTANA, A. E. G. Semiochemicals involved in the interactions between cowpea (Vigna unguiculata Walp) and black cawpea aphid (Aphis craccivora Koch). In: LATIN AMERICAN MEETING OF CHEMICAL ECOLOGY, 2., 2012, Huerta Grande. Abstracts... Huerta Grande: Latin American Association of Chemical Ecology, 2012. Resumo em anais.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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| Registros recuperados : 4 | |
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