Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 121, Issue 2, Pages 764-769Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.33405
Keywords
polyurethane; polyol; adhesive; soybean oil; polymeric MDI
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Funding
- Korea Ministry of Environment
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The reactive multihydroxy soybean oil (MHSBO) was synthesized from epoxidized soybean oil (ESBO). The ESBO was reacted with ethylene glycol to obtain MHSBO having high functionality. This study investigated a feasibility to prepare wood adhesive through the reaction of polymeric methylene-diphenyl-4,4'-diisocyanate (pMDI) with MHSBO. Different polyurethane adhesives were prepared with a variety of equivalent mole ratios (eq. mole ratios) of MHSBO to pMDI. The chemical reactions of adhesives were analyzed using H-1 NMR and Fourier transform infrared (FTIR), and their thermal studies were investigated by DSC and TGA. The MHSBO/pMDI resins (3 : 1 and 2 : 1 eq. mole ratios) showed endothermic peaks, whereas the MHSBO/pMDI resins (1 : 2 and 1 : 3 eq. mole ratios) showed exothermic peaks. The best adhesion strength was found when plywood was bonded with the adhesive of a eq. mole ratio of 2 : 1 (MHSBO : pMDI). These results indicated that the bond strength was not related to the reactivity obtained from the FTIR spectra. But it was explained that the adhesion strength increased as the residual -NCO groups in the adhesive reacted with the hydroxy groups of wood during the manufacturing of plywood. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 764-769, 2011
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