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ABSTRACT
The effect of wood extracts on the kinetics of UV curing of an urethane diacrylate was studied by real-time FTIR spectroscopy. Whereas extracts from rose wood (Dalbergia latifolia) inhibit the reaction, curing is not significantly affected by extracts from teak wood (Tectona grandis). Data of the pendulum hardness of the coatings confirm these results. Moreover, the radical scavenging capacity of the extracts was determined relative to benzoquinone by a radiation-chemical method.
ACKNOWLEDGMENTS
R.N.K. is deeply indebted to Prof. R. Mehnert for the invitation to IOM and for giving financial support for carrying out the above investigations. Moreover, R.N.K. thanks the authorities of the Universiti Sains Malaysia for deputing to IOM and IAEA for a fellowship for the initial phase of the present work. The authors wish to thank Prof. S. Hosoya Wood Chemistry Laboratory, Forest and Forest Products Research Institute, Ibaraki, Japan for providing the samples of rosewood and teakwood extracts. Additionally, we are indebted to Dr. H. Langguth and Mrs. K. Czihal for technical assistance.