Synergistic effect of heartwood extractives and quaternary ammonium compounds on termite resistance of treated wood |
| |
Authors: | Hwang Won-Joung Kartal S Nami Yoshimura Tsuyoshi Imamura Yuji |
| |
Institution: | Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji 611-0011, Kyoto, Japan. wjhwang@rish.kyoto-u.ac.jp |
| |
Abstract: | This study evaluates the synergistic effect of wood extractives and quaternary ammonium compounds (QACs) on the resistance to termites of several treated wood species. Wood specimens from different natural durability classes were extracted with either hot water alone or hot water + ethanol/benzene. The extracted and unextracted wood specimens were treated with either didecyldimethylammonium tetrafluoroborate (DBF) or commercial didecyldimethylammonium chloride (DDAC) solutions and then exposed to subterranean termites, Coptotermes formosanus Shiraki, for 3 weeks under laboratory conditions. The results showed that extractives of the heartwood portions of the wood species contributed to increased resistance against termite attack in the presence of either DBF or DDAC wood preservatives. The synergistic effect of wood extractives and DBF was much clearer with Pseudotsuga menziesii (Mirbel) Franco and Tsuga heterophylla Sarg wood samples. Further studies are needed for a better understanding of the synergism between wood extractives and either DBF or DDAC using both the sapwood and heartwood portions of the same wood species. |
| |
Keywords: | heartwood extractives quaternary ammonium compounds termite resistance Coptotermes formosanus |
本文献已被 PubMed 等数据库收录! |