two thermoplastic polymers (pkxa polysulfone and r-5000 polyphenylsulfone) having high temperature capabilities(+300 f) were evaluated as adhesives for bonding steel and titanium adherends. the pkxa polysulfone adhesive was also evaluated on polyimide/glass composites. chromic acid anodize and sulfuric acid anodize were selected as the surface treatments for titanium and steel, respectfully. the primer system selected was br-34 polyimide primer (american cyanimid) subsequently coated with a thin solution of the bonding resin. prior to bonding, the thermoplastic resins were solution coated on 112e glass with a-1100 finished for bondline control. the environmental resistance of the pkxa and r-5000 adhesives were evaluated after exposure to thermal environments (180, 300 f), deicing fluid, jp-4 fuel, hydraulic fluids (mil-h-83306, mil-h-5606), synthetic lubricant (mil-l-7808), salt water, cleaning solvent (stoddard), naphtha, corrosion inhibitor mil-c-85054, naphtha, and caustic (naoh) solutions. lap shear and crack extension specimens were used to evaluate the environmental resistance of the adhesive systems. peel, creep and fatique properties were determined for the adhesives on steel and titanium adherends. (author)