Properties of crosslinked waterborne polyurethane adhesives with modified melamine: Effect of curing time, temperature, and HMMM content |
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Authors: | Mohammad Mizanur Rahman Han-Do Kim Won-Ki Lee |
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Institution: | (1) Department of Organic Material Science & Engineering, Pusan National University, Busan, 609-735, Korea;(2) Division of Chemical Engineering, Pukyong National University, Busan, 608-739, Korea |
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Abstract: | A series of crosslinked waterborne polyurethane (WBPU) adhesives were prepared by prepolymer synthesis. Modified melamine,
hexamethoxymethyl melamine (HMMM) was used as the crosslinking agent. It was elucidated by FTIR and 1H-NMR spectroscopy that the crosslinking reaction occurred between the polyurethane carboxyl acid salt groups and the HMMM
methoxy groups. The hydrophobicity of the WBPU films increased after HMMM crosslinking. As the HMMM content was increased
(increasing mole ratio of HMMM/dimethylol propionic acid (DMPA)), the water uptake (%) of the film decreased, and the water
contact angle increased. The thermal stability, tensile strength, and initial modulus increased with increasing HMMM content
up to an optimum value (mole ratio of HMMM/DMPA=0.5) at which point the maximum thermal stability, tensile strength, and initial
modulus were recorded. The adhesive strength was found to be dependent on HMMM content, curing time, and temperature. The
adhesive strength of crosslinked WBPU in the case of optimum HMMM content (8.46 wt%) was only slightly affected after immersing
adhesive bonded nylon fabrics in water (for up to 2 days). |
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Keywords: | Adhesive Polyurethane Melamine |
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