Abstract
Wood dowel (Acer mono) was joined into wood member (Cryptomeria japonica) by a polymeric MDI(PMDI) or a polyurethane resin , which is an isocyanate adhesive. Infrared microspectrosopicspectra at the joints were 2-dimensionally measured by diffuse reflectance method , and then NCO group was identified due to its asymmetric stretching vibrational band (2270cm⁻¹).Thedistributions of the adhesives (isocyanate compounds) around the joints were displayed by colorscorresponding to the band intensityat 2270cm⁻¹. The color maps exhibited that the PADI excessively penetrates into the wood member in the axial direction because of its low viscosity (ca.0.2 Pa．s) , and indicated that only the fluid components in the polyurethane resin (ca.200 Pa・s) , which are not so large , move from the glue line to the wood member. (Received:December15,1999)
