It was investigated for the adsorption behaviors of isocyanate monomer, a main component of polyurethaneadhesives, on the surface of carbon steel by surface analysis. It was suggested that from XPS and ToF-SIMSanalysis that isocyanate monomer reacted with hydroxyl group on steel surface and amines generated byhydrolysis reaction of isocyanates with water and hydroxyl groups on steel. The formation of these covalentbonds on the surface of substrates was considered to be one reason that polyurethane makes good adhesives.
The authors investigated physical properties of diglycidylether of bisphenol-A（ DGEBA） modified byvarious epoxy terminated macroglycols（E-glycol） which were made from polyoxytetramethyleneglycol（PTMG） or polycaprolactone glycol（ PCL）, respectively. E-glycol were added to DGEBA, then the mixtureswere cured by typical tertiary amine. The relationship between physical properties of cured epoxy resins andchemical structure or molecular weight of E-glycol was clarified. PTMG type E-glycol（ E-PT） which hadhigher molecular weight caused T-peel strength increased at the low amount region. Tensile shear strengthwas drastically decreased as increasing the amount of E-PT. The tendency of bending properties and fracturetoughness had great resemblance to the one of tensile shear strength. On the other hand, PCL type E-glycol（E-PCL） could not improve adhesive properties and bending properties, but fracture toughness effectively.The improvement effect has no relationship with the molecular weight of E-PCL. It was found that thesephysical properties correlated with the respective morphology as follows. The cured compound which hadhigh value of tensile shear strength, bending properties and fracture toughness showed three-dimensionalfine uneven in fracture surface. And in that had high value of T-peel strength bigger roundish uneven wasobserved.