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Enhanced Properties of Cryptomeria japonica (Thunb ex L.f.) D.Don from the Azores Through Heat-Treatment
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Advisor(s)
Abstract(s)
This study evaluates the chemical, physical, mechanical, and biological properties of untreated and heat-treated Cryptomeria japonica (Thunb ex L.f.) D.Don wood
from the Azores, Portugal. Heat treatment was performed at 212 ◦C for 2 h following
the Thermo-D class protocol. Chemical analysis revealed an increase in ethanol soluble
extractives and lignin content after heat treatment, attributed to hemicellulose degradation
and condensation reactions. Dimensional stability improved significantly, as indicated
by reduced swelling coefficients and higher anti-swelling efficiency (ASE), particularly
in the tangential direction. Heat-treated wood demonstrated reduced water absorption
and swelling, enhancing its suitability for applications requiring dimensional stability.
Mechanical tests showed a decrease in bending strength by 19.6% but an increase in the
modulus of elasticity (MOE) by 49%, reflecting changes in the wood’s structural integrity.
Surface analysis revealed significant color changes, with darkening, reddening, and yellowing, aligning with trends observed in other heat-treated woods. Biological durability tests
indicated that both untreated and treated samples were susceptible to subterranean termite
attack, although heat-treated wood exhibited a higher termite mortality rate, suggesting
potential long-term advantages. This study highlights the impact of heat treatment on
Cryptomeria japonica wood, emphasizing its potential for enhanced stability and durability
in various applications.
Description
Keywords
chemical composition color dimensional stabilit mechanical propertie termite resistance thermal modification
Pedagogical Context
Citation
Esteves, B.; Nunes, L.; Lopes, R.; Cruz-Lopes, L. Enhanced Properties of Cryptomeria japonica (Thunb ex L.f.) D.Don from the Azores Through Heat-Treatment. Forests 2025, 16, 166. https://doi.org/10.3390/ f16010166
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CC License
Without CC licence