Bonding Strength of Synthetic, Poly (arnino acid) s on Metals

Abstract

As a basic approarch to the adhesive power of marine proteins, the bonding strength (tensile and compressive shear) of a variety of synthetic poly(amino acid)s on metals has been investigated in water system. High-molecular-weight poly(_L-lysine) hydrobromide was found to have the highest tensile strength (123 kg/cm²) on iron, while gelatin the highest compressive shear strength (21 kg/cm²) on Al₂O₃. High-molecular-weight water-soluble poly(amino acid)s, which contain lysyl residues and are random-coil conformation, are effective for the adhesion on metals. Poly(glutamic acid) and poly(cysteine) are little effective adhesion on metals.
The results of the bonding strength of poly(amino acid)s in organic solvents were also described. Poly(_DL-methionine) in dichloromethane is most adhesive on metals. !