THE FORMATION OF COORDINATION BONDS AT THE ALUMINUM-OXIDE POLYPROPYLENE BOUNDARY

The chemical composition of the boundary layer between aluminum foil a nd a propylene protective coating is studied by means of X-ray photoel ectron spectroscopy. Macromolecules, low-molecular fragments of the th ermally oxidized polypropylene, and their anions interact with the par tially coordinated Al3+ atoms to form surface complexes. The complexes have hydrophobic properties and chelate structure and are not affecte d by aggressive OH-ions. The complexes decompose under the atmospheric conditions because of the destruction of Al-O bonds and the transform ation of aluminum oxide into hydroxide.