Industrial & Engineering Chemistry Research, Vol.58, No.31, 14139-14145, 2019
Effects of High Temperature Immersion on Interfacial Adhesion between Polypropylene and Nickel Substrate
To investigate the effects of high temperature immersion in electrolyte-like solution on interfacial adhesion of polypropylene (PP)/nickel laminate, three kinds of treatments were conducted for comparison, which were immersion, immersion/drying, and single drying, which induced different wetting extents at interface. Compared to the drying treatment, the immersion caused a more dramatical deterioration of adhesive strength at same treating period, which resulted from the good wetting of solution to the interface of PP/Ni. Moreover, it was found that the variation tendency of adhesive strength was irrespective of the treatment methods. This suggested that the treatment performed at high temperature determined the tendency and not the immersion. With the temperature increasing,, the relaxation of internal stress caused the decrease of adhesive strength, whereas the thermal expansion of polymer tended to strengthen adhesion as predicted by FEM. Therefore, the competition of these two factors was considered to produce the variation tendency of adhesive strength.