Abstract
AbstractThe adhesive properties of PET have been enhanced by treatments with alkaline solutions and CF4/02 plasmas. Alkaline solution induce hydrolysis of the polyester and etching, with consequent strong roughening of the surface. Adhesion siemed more related to etching than to surface chemistry modifications, suggesting a prominent role of mechanical interlocking.CF4/02 plasmas did not induce significant etching, but the surface chemistry was strongly altered. Ester bridges were effectively removed by the plasma, high oxygen mixtures destroyed aromatic rings and introduced oxygen by the hydroperoxide mechanism. Adhesion was worsened by the introduction of fluorocarbon radicals by Low oxygen discharges. The most effective enhancement was obtained with the 30 % discharge, where the aromatic rings are still quite intact, while ester bridges are removed with formation of phenolic end groups.
Published Version
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