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http://dx.doi.org/10.5658/WOOD.2010.38.5.414

Effect of pMDI or HDI Content in UMF Resin on Bonding High Moisture Content Veneers  

Xu, Guang-Zhu (Department of Forest Products & Biotechnology, College of Forest Science, Kookmin University)
Eom, Young-Geun (Department of Forest Products & Biotechnology, College of Forest Science, Kookmin University)
Lee, Byoung-Ho (Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University)
Kim, Hyun-Joong (Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.38, no.5, 2010 , pp. 414-420 More about this Journal
Abstract
The effect of polymeric diphenyl methane-4,4-diisocyanate (pMDI) or 1,6-hexamethylene diisocyanate (HDI) in the UMF resin was discussed for improvement of the dry and wet shear strengths of plywood manufactured from high moisture content veneers. The curing behavior of UMF resin by pMDI or HDI content was examined by DSC and TGA, and its adhesion performance was evaluated by dry and wet shear strength tests of plywood. With the increase of pMDI content in the UMF resin, the curing temperature, reaction enthalpy (${\Delta}H$), and thermal stability consistently increased. With the increase of HDI content in the UMF resin, however, the curing temperature and reaction enthalpy (${\Delta}H$) decreased consistently and the thermal stability slightly increased in the range of 200 to $400^{\circ}C$ but decreased beyond $400^{\circ}C$. Also, the dry tensile shear strength increased up to the pMDI content of 5% and then decreased with its further addition but the wet tensile shear strength showed slight tendency to increase with the increase of pMDI content in the UMF resin. As the HDI content increased, however, the dry and wet tensile shear strengths of plywood consistently increased.
Keywords
UMF resin; pMDI; HDI; high moisture content veneer; tensile shear strength; plywood;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Lei, H., A. Pizzi, G. Du, and A. Despres. 2006. Variation of MUF and PMUF resins mass fractions during preparation. Journal of Applied Polymer Science 100(6): 4842-4855.   DOI   ScienceOn
2 Osman, Z., A. Pizzi, W. Kantner, and M. C. Triboulot. 2005. PUF panel adhesives mixed with additional urea and reinforced by isocyanate. Holz Roh- Werkst 63(1): 53-56.   DOI
3 Pizzi. A., J. Valenzuela, and C. Westermeyer. 1993. Non-emulsifiable, water-based diisocyanate adhesives for exterior plywood. Part 2: Theory application and industrial results. Holzforschung 47(1): 69-72.
4 Pizzi, A. and T. Walton. 1992. Non-emulsifiable, water-based diisocyanate adhesives for exterior plywood. Part 1: Novel reaction mechanisms and their chemical evidence. Holzforschung 46(6): 541 -547.   DOI
5 Rogulska, M., W. Podkoscielny, A. Kultys, S. Pikus, and E. Pozdzik. 2007. Studies on thermo-plasticpolyurethanes based on new diphenyl-ethane-derivative diols. I. Synthesis and characterization of nonsegmented polyurethanes from HDI and MDI. European Polymer Journal 43(4): 1402-1414.   DOI   ScienceOn
6 Simon. C, B. George, and A. Pizzi. 2002. UF/ pMDI wood adhesives: Networks blend vs. copolymerization. Holzforschung 56(3): 327-334.   DOI   ScienceOn
7 Zheng, J. and C. F. Frazier. 2000. Investigations in the nature of PF/pMDI hybrid adhesives. Wood Adhesives 2000, Extended Abstracts. Forest Products Society, Tahoe, p. 121.
8 KS F 3101. 2006. Ordinary plywood. Korean Standards Association.
9 Du. H., Y. H. Zhao, Q. F. Li, J. W. Wang, M. Q. Kang, X. K. Wang, and H. W. Xiang. 2008. Synthesis and characterization of waterborne pol-yurethane adhesive from MDI and HDI. Journal of Applied Polymer Science 110(3): 1396-1402.   DOI   ScienceOn
10 He, G. and N. Yan. 2005. Effect of moisture content on curing kinetics of pMDI resin and wood mixtures. International Journal of Adhesion and Adhesive 25: 450-455.   DOI   ScienceOn
11 Kim, S.-M., N.-S. Kwak, Y.-Y. Yang, B.-K. Yim, B.-Y. Park, and T.-S. Hwang. 2005. Synthesis and physical properties of polycaprolactone based poly-urethanes using aliphatic or aromatic diisocyanates. Polymer Korea 29(3): 253-259.   과학기술학회마을
12 Kweon, D.-K., D.-S. Cha, H.-J. Park, and S.-T. Lira 2000. Starch-g-polycaprolactone copolymerization using diisocyanate intermediates and thermal characteristics of the copolymers. Journal of Applied Polymer Science 78(5): 986-993.   DOI