Role of polymer oxidation in the adhesion of polyethylene to metals

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Abstract
Untreated polyethylene will adhere well to aluminum only if it is applied in an oxidizing atmosphere. Peel strengths for coatings applied to various bright copper surfaces are far lower, probably because of decrease in polymer oxidation when copper is present. Preoxidized polyethylene sheet adheres well when melted on to copper in nitrogen. In view of earlier evidence for the formation of a weak interfacial layer containing shortchain material, it is proposed that the weak bond strengths so caused are substantially improved by the preferential adsorption of longer‐chain surface‐active oxidized species in the polymers.

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