Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process

Solid wood specimens of Araucaria angustifolia were impregnated with alkoxysilanes hydrolyzed and condensed “in situ” by the solegel process. Alkoxysilanes selected were aminopropyl methyldiethoxysilane and aminopropyl triethoxysilane; it was also used the aminopropyl methyldiethoxysilane/aminoprop...

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Autores principales: Giudice, Carlos Alberto, Alfieri, Paula, Canosa, Guadalupe
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: Elsevier 2017
Materias:
wood; siloxane; rot; polyporus meliae; coriolus versicolor; dimensional stability
Acceso en línea:http://hdl.handle.net/20.500.12272/2202
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-2202
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic wood; siloxane; rot; polyporus meliae; coriolus versicolor; dimensional stability
spellingShingle wood; siloxane; rot; polyporus meliae; coriolus versicolor; dimensional stability
Giudice, Carlos Alberto
Alfieri, Paula
Canosa, Guadalupe
Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process
topic_facet wood; siloxane; rot; polyporus meliae; coriolus versicolor; dimensional stability
description Solid wood specimens of Araucaria angustifolia were impregnated with alkoxysilanes hydrolyzed and condensed “in situ” by the solegel process. Alkoxysilanes selected were aminopropyl methyldiethoxysilane and aminopropyl triethoxysilane; it was also used the aminopropyl methyldiethoxysilane/aminopropyl triethoxysilane mixture in 50/50 ratio w/w. The pH was adjusted to alkaline value for controlling kinetic of hydrolysis and condensation reactions. Impregnation process was carried out under controlled operating conditions to achieve different weight gains of the chemical modifier. Unmodified and modified wood specimens were exposed to brown rot (Polyporus meliae) and white rot (Coriolus versicolor) under laboratory conditions. The results indicate that the improved resistance to fungal exposure would be based on the wood chemical modification (the protection of cellulose caused by steric hindrance of hSieOeCellulose preventing the formation of enzymeesubstrate complex). Moreover, the results also would be based on the enhanced dimensional stability of the treated wood; the quoted high dimensional stability, which limits the growth of the spores, is supported in the hydrophobicity generated by both the decreasing of the amount of polar hydroxyl groups and the partial occupation of pores with polysiloxanes.
format Artículo
publishedVersion
Artículo
author Giudice, Carlos Alberto
Alfieri, Paula
Canosa, Guadalupe
author_facet Giudice, Carlos Alberto
Alfieri, Paula
Canosa, Guadalupe
author_sort Giudice, Carlos Alberto
title Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process
title_short Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process
title_full Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process
title_fullStr Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process
title_full_unstemmed Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by solegel process
title_sort decay resistance and dimensional stability of araucaria angustifolia using siloxanes synthesized by solegel process
publisher Elsevier
publishDate 2017
url http://hdl.handle.net/20.500.12272/2202
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