EFFECTS OF PLASMA SURFACE TREATMENT ON BENDING STRENGTH AND MODULUS OF ELASTICITY OF BEECH AND POPLAR PLYWOOD

Cenk Demirkir, Ismail Aydın, Semra Colak, Hasan Ozturk

Abstract


This is a study on the effect of plasma treatment with different gases and plasma intensity on the
bending strength and modulus of elasticity of plywood manufactured from beech and poplar. Oxygen
(O2) and ammonia (NH3) plasma were applied on the veneer sheets; two plasma intensities were applied
on the veneers with 150 and 300 W in the plasma chamber during one minute. Phenol formaldehyde
resin was applied on one surfaces of each veneer with approx. 160 g/m2. Bending strength and modulus
of elasticity were determined according to EN 310.The effects of plasma surface treatment on chemical
structure of the panels were determined with FTIR-ATR analysis. Bending strength of all tested panels
slightly and partly increased without statistical significance when applying oxygen plasma. The effect
of ammonia plasma treatment on bending strength and was determined by the wood species and the
plasma intensity, and it was not uniform. Modulus of elasticity of the panels with oxygen plasma
treatment showed in most cases improvement, whereas ammonia plasma pretreated veneers caused
lower values compared to the control panels.

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