Wettability and surface free energy on heat-treated Pinus sp and Erisma sp woods

Autor(es)

Ziglio, Analine Crespo ; Carvalho Santos, Sabrina Nicoleti ; Mendes, Nadine ; Goncalves, Debora

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIA FORESTALIS; v. 45, n. 113, p. 161-167, MAR 2017.
• Citações Web of Science: 0

Resumo

This study aims to investigate wettability, surface polarity, and mass loss in two reforestation woods, Pinus sp. (softwood) and Erisma sp (hardwood), after heat treatment. The wood samples were heated to 100 degrees C, 140 degrees C and 180 degrees C, meanwhile a control group was kept at a fixed temperature of 25 degrees C. Different test liquids were employed in order to obtain the contact angles (wetting angles) formed on the heat-treated sample surfaces. From such measurements, the values of surface free energy, in terms of its polar and dispersive components, were calculated by the Owens-Wendt-Rabel-Kaelble approach. Temperatures far below 180 degrees C proved to be high enough to yield hydrophobic samples, i.e., with relatively high wetting angles and low surface polarity, but without drastic visual and dimensional changes. The impact of heat treatment on the surface properties of Pinus sp. and Erisma sp. was also verified by fungal inoculation (Pycnoporus sanguineus). Compared to Pinus sp., heat-treated Erisma sp. showed improved properties, such as mass stability, surface polarity and wettability. (AU)

• Processo FAPESP: 12/13003-5 - Efeitos nocivos causados por fungos em amostras de madeiras tropicais e de reflorestamento: análise das superfícies das amostras após tratamento térmico
• Beneficiário: Debora Goncalves
• Modalidade de apoio: Auxílio à Pesquisa - Regular