Effect of postcure conditions on the dynamic mechanical behavior of water-based polymer-isocyanate adhesive for wood |
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Authors: | Nan Ling Naruhito Hori Akio Takemura |
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Institution: | (1) Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan |
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Abstract: | To study the effect of postcure conditions on the viscoelastic behavior of water-based polymer isocyanate adhesives for wood
(API adhesive), dynamic mechanical analysis (DMA) was performed for a simplified model of API adhesives under various postcure
conditions. These conditions were achieved by storing the samples at room temperature or by heating them in an oven. Fourier
transform infrared (FT-IR) spectroscopy was performed to test for residual isocyanate groups (NCO) and isocyanate derivatives
to elucidate the reaction mechanism under the postcure conditions. DMA revealed that the postcure conditions led to wide variations
in the viscoelastic behaviors of API films. FT-IR analysis confirmed the decrease of residual isocyanate during postcure treatments.
However, the complete consumption of isocyanate could not be achieved under the postcure conditions. A good correlation was
found between the DMA result and the chemical changes in the API samples heated above 140°C. However, no correlation was observed
in the case of the samples heated at temperatures less than 140°C. This implies that postcure conditions led to a difference
in the reaction chemistry of API.
Part of this article was presented at the 55th Annual Meeting of the Japan Wood Research Society, Kyoto, March 2005 |
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Keywords: | Water based Isocyanate adhesive Postcure Dynamic mechanical analysis |
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