Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment
The effects of thermal treatment on the wettability and shrink resistance of Araucaria angustifolia (Parana pine) were studied from 20 to 200 °C. The contact angles of water droplets on untreated and heat-treated samples were measured by the sessile drop method in the grain of heartwood and sapwood...
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2010-09-01
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Series: | Materials Research |
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Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392010000300012 |
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doaj-316ea04c28f544cc909fd1d3929d85382020-11-24T21:33:03ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392010-09-0113335135410.1590/S1516-14392010000300012Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating TreatmentRodrigo Marques de OliveiraAndré BrisolariAlmir SalesDébora GonçalvesThe effects of thermal treatment on the wettability and shrink resistance of Araucaria angustifolia (Parana pine) were studied from 20 to 200 °C. The contact angles of water droplets on untreated and heat-treated samples were measured by the sessile drop method in the grain of heartwood and sapwood cut in the radial, longitudinal, and tangential directions. A significant increase of the contact angles was verified for the samples from room temperature to 120 °C, in particular in the radial and tangential directions; at higher temperatures, the contact angles assumed almost constant values. From 120 to 200 °C, the sapwood of Araucaria angustifolia showed better dimensional stability and lower thermal resistance when compared to the heartwood. Variations of color were also studied by using the CIELab system, which showed to be capable of accurately distinguishing samples treated at different temperatures.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392010000300012Araucaria angustifoliawettabilitywoodcontact anglessurface modifications |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rodrigo Marques de Oliveira André Brisolari Almir Sales Débora Gonçalves |
spellingShingle |
Rodrigo Marques de Oliveira André Brisolari Almir Sales Débora Gonçalves Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment Materials Research Araucaria angustifolia wettability wood contact angles surface modifications |
author_facet |
Rodrigo Marques de Oliveira André Brisolari Almir Sales Débora Gonçalves |
author_sort |
Rodrigo Marques de Oliveira |
title |
Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment |
title_short |
Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment |
title_full |
Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment |
title_fullStr |
Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment |
title_full_unstemmed |
Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heating Treatment |
title_sort |
wettability, shrinkage and color changes of araucaria angustifolia after heating treatment |
publisher |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
series |
Materials Research |
issn |
1516-1439 |
publishDate |
2010-09-01 |
description |
The effects of thermal treatment on the wettability and shrink resistance of Araucaria angustifolia (Parana pine) were studied from 20 to 200 °C. The contact angles of water droplets on untreated and heat-treated samples were measured by the sessile drop method in the grain of heartwood and sapwood cut in the radial, longitudinal, and tangential directions. A significant increase of the contact angles was verified for the samples from room temperature to 120 °C, in particular in the radial and tangential directions; at higher temperatures, the contact angles assumed almost constant values. From 120 to 200 °C, the sapwood of Araucaria angustifolia showed better dimensional stability and lower thermal resistance when compared to the heartwood. Variations of color were also studied by using the CIELab system, which showed to be capable of accurately distinguishing samples treated at different temperatures. |
topic |
Araucaria angustifolia wettability wood contact angles surface modifications |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392010000300012 |
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