Patination of Wood with Diethanolamine: Characteristics and its Resistance Against Weathering

Patination or producing the appearance of age has a great importance in the restoration of historical relics and furniture industry. In this research, patination of white poplar wood (Populus alba L) with Diethanolamine (DEA) and its resistance against weathering was investigated. Treated and untreated samples artificially were weathered for 300 and 800 hours, regarding ASTM 2565-99. Structural changes were investigated by application of Colorimetery, ATR-FTIR spectroscopy and Scanning Electron Microscopy. Results showed that DEA reacts with carbonyl group in hemicelluloses and syringyl unit of lignin. It causes to increase of darkness, yellowness and redness of wood. In the first stage of weathering (300 hours) photooxidation of lignin localized on guaiacyl unit, but in the second stage (800 hours) syringyl unit of lignin was degraded. Patination does not protect the white poplar wood against weathering for long time.