Enhancement of adhesion by applying amine primer to isotactic polypropylene and open time dependence of primer effect

Abstract Primer treatments to improve the adhesive properties of isotactic polypropylene ( it. PP) have advantages in terms of their simple process and reasonable costs. However, a large contribution to the optimization of the treatment condition is required because of many parameters for achieving high adhesion strength. In addition, the mechanisms of primer effects have not been explained completely. We investigated the primer effects of dimethyloctadecylamine on the it. PP surface from the viewpoint of structural and surface properties. The it. PP main chains in the thin film state were aligned in parallel to the substrates. After amine primer treatment, the dimethyloctadecylamine assembled on the it. PP layer within 5 h. The primer alignments enhanced adhesive strength between it. PP and cyanoacrylate adhesives. The surface free energy of it. PP and cyanoacrylate adhesives was also increased by primer treatment. The time dependence of primer effects on the adhesion strength and surface properties was clarified.