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    Effect of Thermal Ageing on the Gloss and the Adhesion Strength of the Wood Varnish Layers
    (North Carolina State Univ Dept Wood & Paper Sci, 2013) Demirci, Zafer; Sönmez, Abdullah; Budakçı, Mehmet
    The present study investigated the effect of thermal ageing of several wood varnishes on film characteristics. For this purpose, alkyd, two-part polyurethane (urethane-alkyd), and water-borne (self-cross-linked polyurethane) varnishes were applied on Scots pine (Pinus sylvestris L.), Eastern beech (Fagus orientalis L.), and sessile oak (Quercus petraea L.). The test samples had 8% or 12% moisture content. The samples were then thermally aged for 25, 50, 75, and 100 days at 25, 50, 75, and 100 degrees C. The decrease in adhesion strength of the varnish layers and the loss in surface gloss were determined in accordance with the ISO 4624 and ISO 2813 standards. The results of the study indicated that thermal ageing caused a decrease in the adhesion strength and gloss values.
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    EFFECTS OF THERMAL AGING ON THE FILM HARDNESS OF SOME WOOD VARNISHES
    (North Carolina State Univ Dept Wood & Paper Sci, 2011) Sönmez, Abdullah; Budakçı, Mehmet; Demirci, Zafer; Akkuş, Memiş
    This study was performed to determine the effects of thermal aging on the film hardness of some wood varnishes. For this purpose, Scots pine (Pinus sylvestris L.), Eastern beech (Fagus orientalis L.), and oak (Quercus petraea L.) samples coated with synthetic (alkyd), two-part polyurethane (urethane-alkyd), and waterborne (self cross-linked polyurethane) varnishes were evaluated at a moisture content of 8% and 12%. Afterwards, thermal aging processes were performed for periods of 25, 50, 75, and 100 days at 25 degrees C, 50 degrees C, 75 degrees C, and 100 degrees C. Hardness changes in the varnish films were measured in accordance with ISO 1522-2006. According to the test results, the samples prepared with polyurethane varnishes at 8% moisture content give the best results.