Dielectric and mechanical properties of various species of Madagascan woods

The low-temperature molecular mobility of three different wood species was analyzed, with the two major constituents—cellulose and lignin—as reference. Mechanical and dielectric dynamic techniques were used. In order to observe the fine structure of the broad relaxation modes of wood, a very low-fre...

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Bibliographic Details
Published in:Wood science and technology 2017-11, Vol.51 (6), p.1389-1404
Main Authors: Roig, Frédéric, Ramanantsizehena, Georgette, Lahatra Razafindramisa, Fils, Dantras, Eric, Dandurand, Jany, Hoyet, Hervé, Bernés, Alain, Lacabanne, Colette
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Cellulose
Ceramics
Composites
Dielectric properties
Dielectric relaxation
Engineering Sciences
Fine structure
Frequency analysis
Glass
Life Sciences
Lignin
Low temperature
Machines
Manufacturing
Materials
Mechanical properties
Miscibility
Mobility
Natural Materials
Original
Processes
Species
Temperature effects
Ultrastructure
Wood
Wood Science & Technology
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Summary:The low-temperature molecular mobility of three different wood species was analyzed, with the two major constituents—cellulose and lignin—as reference. Mechanical and dielectric dynamic techniques were used. In order to observe the fine structure of the broad relaxation modes of wood, a very low-frequency analysis was carried out by thermostimulated current technique. Low-temperature relaxations of rosewood were assigned to low-temperature relaxations of cellulose. There was no dielectric response of lignin in rosewood. Contrarily, both cellulose and lignin responses were distinguished in ebony and varongy. Thermostimulated currents analyses exhibit the specific behavior of lignin in the various wood species. Moreover, the relaxation mode of cellulose observed at lower temperature remains localized in rosewood, while it tends to delocalize in varongy and ebony. The nature and intensity of physical interactions that induce variation of phase miscibility might be responsible for the observed differences. Even at the scale of the γ relaxation, physical interactions modify molecular mobility.
ISSN:0043-7719
1432-5225
DOI:10.1007/s00226-017-0936-3