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Weathering of Prunus sargentii Specimens Modified with Acetic Anhydride and Formaldehyde Vapor  

Kang, Ho-Yang (College of Agriculture, Chungnam National University)
Kim, Su-Won (College of Agriculture, Chungnam National University)
Park, Sang-Jin (College of Agriculture, Kyungpook National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.31, no.5, 2003 , pp. 57-64 More about this Journal
Abstract
Small cherry specimens modified with acetic anhydride and formaldehyde vapor phase were weathered by outdoor exposure and accelerated conditioning in a climate chamber. The effects of the chemical modification were evaluated by measuring their weight percentage gains (WPG), hygroscopicity and color differences before and after weathering. The average WPGs of the 72 hour acetylated and formaldehyde-treated specimens were 8.1 and 15.7%, respectively. After outdoor exposure for more than 2 months, the acetylated specimens lost weights by only 1.5%, but the formaldehyde-treated did much more than the formers. It was revealed that acetylation reduced the hygroscopicity and discoloration of wood while formaldehyde treatment didn't. Moreover the longer is the formaldehyde treatment time the more degraded after weathering. It was concluded that the vapor-phase acetylation could be applied for improving the dimensional stability of old wooden blocks.
Keywords
acetylation; formaldehyde; outdoor exposure; accelerated weathering; colorimeter; dimensional stability;
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