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Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.)

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Abstract

Extractives can affect the vibrational properties tanδ (damping coefficient) and E′/ρ (specific Young’s modulus), but this is highly dependent on species, compounds, and cellular locations. This paper investigates such effects for African Padauk (Pterocarpus soyauxii Taub.), a tropical hardwood with high extractives content and a preferred material for xylophones. Five groups of 26 heartwood specimens with large, yet comparable, ranges in vibrational properties were extracted in different solvents. Changes in vibrational properties were set against yields of extracts and evaluation of their cellular location. Methanol (ME) reached most of the compounds (13%), located about half in lumen and half in cell-wall. Water solubility was extremely low. tanδ and E′/ρ were very strongly related (R 2 ≥ 0.93), but native wood had abnormally low values of tanδ, while extraction shifted this relation towards higher tanδ values. ME extracted heartwood became in agreement with the average of many species, and close to sapwood. Extractions increased tanδ as much as 60%, irrespective of minute moisture changes or initial properties. Apparent E′/ρ was barely changed (+2% to −4%) but, after correcting the mass contribution of extracts, it was in fact slightly reduced (down to −10% for high E′/ρ), and increasingly so for specimens with low initial values of E′/ρ.

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Acknowledgments

The authors appreciate the help of C. Baudassé and N. Leménager in CIRAD. This work has been supported by a Post-Doctoral Fellowship from Japanese Society for the Promotion of Science.

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Authors and Affiliations

  1. Laboratory of Forest Resource Circulating Circles, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, 606-8522, Japan

    Iris Brémaud & Kazuya Minato

  2. Production et valorisation des bois tropicaux et méditerranéens, CIRAD PERSYST Department, TA B40/16 BP 5035, 34398, Montpellier cedex 5, France

    Nadine Amusant

  3. Laboratoire de Mécanique et Génie Civil, CNRS, Université Montpellier II, Place E. Bataillon, cc 048, 34095, Montpellier cedex 5, France

    Iris Brémaud & Joseph Gril

  4. Ecologie des Forêts de Guyane, CNRS, BP 316, 97379, Kourou cedex, French Guyana

    Bernard Thibaut

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  1. Iris Brémaud
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  2. Nadine Amusant
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  3. Kazuya Minato
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  4. Joseph Gril
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  5. Bernard Thibaut
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Correspondence to Iris Brémaud.

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Brémaud, I., Amusant, N., Minato, K. et al. Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.). Wood Sci Technol 45, 461–472 (2011). https://doi.org/10.1007/s00226-010-0337-3

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  • DOI: https://doi.org/10.1007/s00226-010-0337-3

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