Journal
JOURNAL OF WOOD SCIENCE
Volume 58, Issue 1, Pages 38-45Publisher
SPRINGER TOKYO
DOI: 10.1007/s10086-011-1214-x
Keywords
Wood-based molding; Citric acid; Natural wood adhesive; Physical properties
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [21580206]
- Special Coordination Funds for Promoting Science and Technology
- Grants-in-Aid for Scientific Research [21580206] Funding Source: KAKEN
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The wood-based moldings were fabricated by using only citric acid as an adhesive. The mechanical properties, water resistances, thermal properties and chemical structure were investigated. Wood powder obtained from Acacia mangium was mixed with citric acid under certain weight ratios (0-40 wt%), and each powder mixture was molded using two types of metal molds at 200A degrees C and 4 MPa for 10 min. The modulus of rupture and the modulus of elasticity values of the wood-based molding containing 20 wt% citric acid were 35.8 MPa and 5.4 GPa, respectively. The maximum impact strength was 0.94 kJ/m(2) with the same citric acid content. The water resistance increased with increasing citric acid content, and the good resistance to boiling water was also recognized. However, some elution of substances derived from citric acid was observed at high levels of citric acid, causing a decrease in the thermal properties. The ester linkages were detected by Fourier transform infrared spectroscopy, indicating that the citric acid reacted with the wood. Our results demonstrated that citric acid brought about good adhesiveness for fabricating the wood-based molding.
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