1. Effect of extractions on dynamic mechanical properties of white mulberry (Morus alba)
- Author
-
Marie-France Thévenon, Kambiz Pourtahmasi, Iris Brémaud, Olivier Arnould, Joseph Gril, Aida Se Golpayegani, Mécanique de l'Arbre et du Bois ( MAB ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Production et valorisation des bois tropicaux ( Bois tropicaux ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ), Department of Wood and Paper Science and Technology, University of Tehran, Mécanique de l'Arbre et du Bois (MAB), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Production et valorisation des bois tropicaux (UPR Bois tropicaux), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)
- Subjects
K50 - Technologie des produits forestiers ,0106 biological sciences ,food.ingredient ,Yield (engineering) ,white mulberry wood (Morus alba L.) ,Modulus ,anisotropy ,DMA ,F50 - Anatomie et morphologie des plantes ,Vibration ,01 natural sciences ,[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] ,Biomaterials ,Bois ,food ,010608 biotechnology ,extractives ,[SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,Composite material ,Anisotropy ,040101 forestry ,Specific modulus ,Chemistry ,Extraction (chemistry) ,04 agricultural and veterinary sciences ,Dynamic mechanical analysis ,Propriété acoustique ,Morus alba ,damping coefficient ,White Mulberry ,Propriété mécanique ,[ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,[ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] ,vibrational properties ,0401 agriculture, forestry, and fisheries ,Dissipation factor - Abstract
Vibrational properties of wood are affected by several parameters, of which extractives can be one of the most important ones. Wood for European musical instruments has been often studied, but traditional Middle Eastern ones had been left unnoticed. In this study white mulberry (Morus alba L.), the main material for long-necked lutes in Iran, was extracted by five solvents of various polarities (water included). Free-free bar forced vibrations were used to measure longitudinal (L) loss tangent (tanδ), storage (elastic) modulus (E′) and specific modulus (E′/γ) in the acoustic range. Their anisotropy between the 3 axes of orthotropy was determined by dynamic mechanical analysis. Native wood had a quite low E L′/γ but its tanδ was smaller than expected, and the anisotropy of tanδ and E′/γ was very low. Removal of extractives caused tanδ to increase and moduli to decrease. Acetone, the most effective solvent on damping despite a moderate extraction yield, increased tanδ L by at least 20% but did not modify E′/γ as much. When used successively, its effects masked those of solvents used afterwards. Anisotropy of E′/γ was nearly unchanged after extraction in methanol or hot water, while tanδ was much more increased in R than in T direction. Results suggest that in white mulberry, damping is governed more by nature and localization of extractives rather than by their crud abundance.
- Published
- 2012