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- W137363726 abstract "Dielectric, ultrasonic and viscoelastic properties of rubber wood werestudied with various physical parameters, such as moisture contents (MC), graindirections and temperatures. Three anisotropic directions, namely longitudinal,radial and tangential to the growth ring were considered for the measurementof these properties. Dielectric properties were measured at low frequenciesfrom 10⁻² to 10⁻⁵ Hz and at microwave frequencies from 1 to 18 GHz. Ultrasonicproperties were determined with a commercial ultrasonic tester at 45 kHz.Viscoelastic properties were carried out with the Dynamic Mechanical ThermalAnalyzer at frequency ranging ,from 0.01 to 1 00 Hz.At low frequencies, five types of dielectric mechanism were observed fordifferent MC such as 1) less than 5%, 2) 5-10%, 3) 11 - 17%, 4) 18-25% and 5)more than 25%. Dielectric constant increased with temperature for thesefrequencies while dielectric loss factor showed minimum value in oven-drycondition. Dielectric constant and dielectric loss factor varied in the order oflongitudinal> radial 2:. tangential directions. Dielectric data at low frequency are in well agreement with those calculated from equivalent circuit using theconcept of universal capacitor. Three equivalent circuits fitted well for data atvery low MC or for oven-dried wood, MC below fiber saturation point and MCabove fiber saturation point. Activation energies were 0.27eV, 0.34eV and0.41eV for longitudinal, radial and tangential directions respectively.At microwave frequencies, dielectric constant and dielectric loss factorwere found to increase with MC ranging from oven-dry up to saturation point.Dielectric constant also decreased with temperature and dielectric loss factorexhibited peaks at 10 GHz. Dielectric constants are predicted well by Winner,Lichteneker and generalized equations with lower value of the exponents.Above 3 G Hz, dielectric loss factor fitted well with the predicted values usingWinner, Kraszewski, Looyenga or with generalized equations with lower valuesof the exponents. Below 3 GHz, dielectric loss factor are unpredictable by thesemixture equations." @default.
- W137363726 created "2016-06-24" @default.
- W137363726 creator A5070157007 @default.
- W137363726 date "1998-06-01" @default.
- W137363726 modified "2023-09-27" @default.
- W137363726 title "Dielectric, Ultrasonic and Viscoelastic Properties of Rubber Wood" @default.
- W137363726 hasPublicationYear "1998" @default.
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