Biobased composites from glyoxal-phenolic resins and sisal fibers


Autoria(s): RAMIRES, Elaine C.; MEGIATTO JR., Jackson D.; GARDRAT, Christian; CASTELLAN, Alain; FROLLINI, Elisabete
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2010

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

http://dx.doi.org/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