IRINA CRINA ANCA SANDU, MIKIKO HAYASHI, VIORICA VASILACHE, DANUT-GABRIEL COZMA, SILVEA PRUTEANU, MARIA URMA, ION SANDU<br>Influence of Organic Solvents and Dispersions <br>on Wooden Supports of Paintings

IRINA CRINA ANCA SANDU, MIKIKO HAYASHI, VIORICA VASILACHE, DANUT-GABRIEL COZMA, SILVEA PRUTEANU, MARIA URMA, ION SANDU
Influence of Organic Solvents and Dispersions
on Wooden Supports of Paintings

Abstract:

This study presents the data regarding the influence of two organic solvents (ethylic alcohol and Red Petroleum from Campeni), mixed with bee propolis, on different wood essences. The impact of these systems was evaluated by studying several physical-structural dynamic characteristics of the treated samples. The shrinkage of lime, poplar, fir and oak wood was studied on three sections (longitude - L, tangential - T and radial - R), for four different variations of atmospheric humidity (100, 85, 65, 25% RH), by gradually lowering the value (100%®85%, 85%®65%, 65%®25% and 25%®0%). In order to evaluate the impact of the treatment, two chemometric characteristics were taken into consideration: difference of shrinkage (DL, DR and DT) and the ratio of those differences (DT/DL, DT/DR and DR/DL). At the end of the paper, the volumetric shrinkage vas studied, alongside with the density and porosity variations of the wood. In order to evaluate the impact of these systems several chemometric characteristics were used: DV, Dr and Dp. The obtained results have shown that poplar tree is virtually unaffected by the two treatments, the lime tree is slightly influenced, while the fir tree and oak tree are the most affected, because the used solutions easily dissolve their organic components. These components leave the resinous channels and pores of the oak tree, thus changing the specific weight and porosity. After the dissolution of the organic components present in natural wood, these solutions create a nano-coating on the surface of the anatomical elements, which confer detectable behaviours only to the wood species containing volatile components that are not compatible with the studied organic solutions. The behaviours can be detected during the interactions of the above mentioned wood species with the hygroscopic moisture in the atmosphere. Keywords: wood supports, moisture content, atmospheric humidity, propolis, Red Petroleum from Campeni, ethylic alcohol, dimensional shrinkage, chemometric characteristics

Issue: 2015, Volume 66, Issue 4

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