Biobased composites from glyoxal-phenolic resins and sisal fibers
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2010
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Resumo |
Lignocellulosic materials can significantly contribute to the development of biobased composites. In this work, glyoxal-phenolic resins for composites were prepared using glyoxal, which is a dialdehyde obtained from several natural resources. The resins were characterized by (1)H, (13)C, (2)D, and (31)P NMR spectroscopies. Resorcinol (10%) was used as an accelerator for curing the glyoxal-phenol resins in order to obtain the thermosets. The impact-strength measurement showed that regardless of the cure cycle used, the reinforcement of thermosets by 30% (w/w) sisal fibers improved the impact strength by one order of magnitude. Curing with cycle 1 (150 degrees C) induced a high diffusion coefficient for water absorption in composites, due to less interaction between the sisal fibers and water. The composites cured with cycle 2 (180 degrees C) had less glyoxal resin coverage of the cellulosic fibers, as observed by images of the fractured interface observed by SEM. This study shows that biobased composites with good properties can be prepared using a high proportion of materials obtained from natural resources. (C) 2009 Elsevier Ltd. All rights reserved. CAPES/COFECUB[422/03/05] COFECUB Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) CNPq Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP |
Identificador |
BIORESOURCE TECHNOLOGY, v.101, n.6, p.1998-2006, 2010 0960-8524 http://producao.usp.br/handle/BDPI/31685 10.1016/j.biortech.2009.10.005 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCI LTD |
Relação |
Bioresource Technology |
Direitos |
restrictedAccess Copyright ELSEVIER SCI LTD |
Palavras-Chave | #Biobased composite #Sisal fibers #Glyoxal #Phenolic matrix #SUGAR-CANE BAGASSE #MECHANICAL-PROPERTIES #FURFURYL ALCOHOL #JUTE FIBERS #WOOD #ADHESIVES #MATRICES #LIGNINS #FORMALDEHYDE #CELLULOSE #Agricultural Engineering #Biotechnology & Applied Microbiology #Energy & Fuels |
Tipo |
article original article publishedVersion |