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Article

Termite Resistance, Chemical and Mechanical Characterization of Paulownia tomentosa Wood before and after Heat Treatment

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Department of Wood Engineering, Polytechnic Institute of Viseu, Av. Cor. José Maria Vale de Andrade, 3504-510 Viseu, Portugal
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Centre for Natural Resources, Environment and Society-CERNAS-IPV Research Centre, Av. Cor. José Maria Vale de Andrade, 3504-510 Viseu, Portugal
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Department of Environmental Engineering, Polytechnic Institute of Viseu, Av. Cor. José Maria Vale de Andrade, 3504-510 Viseu, Portugal
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Department of Ecology and Sustainable Agriculture, Polytechnic Institute of Viseu, Av. Cor. José Maria Vale de Andrade, 3504-510 Viseu, Portugal
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Centre for the Research and Technology of Agro-Environmental and Biological Sciences-CITAB, University of Trás-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal
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Wood Science and Engineering, Luleå University of Technology, Forskargatan 1, 93187 Skellefteå, Sweden
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Department of Forestry and Biomaterials, Czech University of Life Sciences, Kamýcká 1176, Praha 6, 16521 Suchdol, Czech Republic
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Structures Department, LNEC, National Laboratory for Civil Engineering, Av. do Brasil, 101, 1700-066 Lisbon, Portugal
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Centre for Ecology, Evolution and Environmental Changes (cE3c), Rua Capitão João d’Ávila, 9700-042 Angra do Heroísmo, Portugal
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Azorean Biodiversity Group, University of Azores, Rua Capitão João d’Ávila, 9700-042 Angra do Heroísmo, Portugal
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Author to whom correspondence should be addressed.
Academic Editor: Antonios Papadopoulos
Forests 2021, 12(8), 1114; https://doi.org/10.3390/f12081114
Received: 9 August 2021 / Revised: 17 August 2021 / Accepted: 18 August 2021 / Published: 20 August 2021
(This article belongs to the Special Issue Evaluation and Protection of Wood and Wood Products)
The introduction of new species in forest management must be undertaken with a degree of care, to help prevent the spread of invasive species. However, new species with higher profitability are needed to increase forest products value and the resilience of rural populations. Paulownia tomentosa has an extremely fast growth. The objective and novelty of this work was to study the potential use of young Paulownia trees grown in Portugal by using heat treatment to improve its properties, thereby allowing higher value applications of the wood. The average chemical composition of untreated and heat-treated wood was determined. The extractive content was determined by successive Soxhlet extraction with dichloromethane (DCM), ethanol and water as solvents. The composition of lipophilic extracts was performed by injection in GC-MS with mass detection. Insoluble and soluble lignin, holocellulose and α-cellulose were also determined. Physical (density and water absorption and dimensional stability) and mechanical properties (bending strength and bending stiffness) and termite resistance was also determined. Results showed that extractive content increased in all solvents, lignin and α-cellulose also increased and hemicelluloses decreased. Compounds derived from the thermal degradation of lignin were found in heat-treated wood extractions. Dimensional stability improved but there was a decrease in mechanical properties. Resistance against termites was better for untreated wood than for heat-treated wood, possibly due to the thermal degradation of some toxic extractives. View Full-Text
Keywords: chemical composition; heat treatment; mechanical properties; Paulownia tomentosa; termites chemical composition; heat treatment; mechanical properties; Paulownia tomentosa; termites
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MDPI and ACS Style

Esteves, B.; Ferreira, H.; Viana, H.; Ferreira, J.; Domingos, I.; Cruz-Lopes, L.; Jones, D.; Nunes, L. Termite Resistance, Chemical and Mechanical Characterization of Paulownia tomentosa Wood before and after Heat Treatment. Forests 2021, 12, 1114. https://doi.org/10.3390/f12081114

AMA Style

Esteves B, Ferreira H, Viana H, Ferreira J, Domingos I, Cruz-Lopes L, Jones D, Nunes L. Termite Resistance, Chemical and Mechanical Characterization of Paulownia tomentosa Wood before and after Heat Treatment. Forests. 2021; 12(8):1114. https://doi.org/10.3390/f12081114

Chicago/Turabian Style

Esteves, Bruno, Helena Ferreira, Hélder Viana, José Ferreira, Idalina Domingos, Luísa Cruz-Lopes, Dennis Jones, and Lina Nunes. 2021. "Termite Resistance, Chemical and Mechanical Characterization of Paulownia tomentosa Wood before and after Heat Treatment" Forests 12, no. 8: 1114. https://doi.org/10.3390/f12081114

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