Abstract
The effect of addition of Acacia mangium bark powder on the thermosetting processes of two commercial phenol resins, PF-A and PF-B, was examined by bond strength test, torsional braid analysis, and differential scanning calorimetry. When the bark powder was added to PF-A, the bond strength of plywood pressed at 110°C increased and was comparable to that of plywood pressed at 120 and 130°C. However, when the bark powder was added to PF-B, the bond strength of plywood pressed at 110°C was still lower than that of plywood pressed at 120 and 130°C. The relative rigidity and loss tangent of PF-A cured with the bark powder obtained by heating at 100°C were comparable to those at 120 and 140°C, and the reaction enthalpy was increased by bark powder addition. In contrast, chemical reactions for cured PF-B were not enhanced by bark powder addition.
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Acknowledgments
We express our sincere gratitude to Koshii & Co. Ltd. for providing the A. mangium bark powder. We also thank Professor Tsuda, Asahikawa National College of Technology, for his support during the NMR measurements and Mr. Yoshida, Hokkaido Industrial Research Institute, for his support during the DSC measurements.
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Miyazaki, J., Hirabayashi, Y. Effect of the addition of Acacia mangium bark on thermosetting of phenol–formaldehyde resin. Wood Sci Technol 45, 449–460 (2011). https://doi.org/10.1007/s00226-010-0342-6
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DOI: https://doi.org/10.1007/s00226-010-0342-6