Abstract
The structural changes in macromolecules which take place during photo-ageing consist of structural orientation and are accompanied by chemical changes associated with an increase of the oxygen-containing groups, especially of carbonyl. The extremal nature of the adhesive strength of the polyethylen (PE)-steel binding compounds as a function of the extent of oxidation of the polymer, found in this work, is due to macromolecular crosslinking at the surface and the surface and the restriction of mobility. The increase in the concentration of oxygen-containing groups at the PE surface causes inter-crystal plasticization and reduces the micro-hardness at the surface, but also intensifies the reactions between macro-radicals which contain the groups capable of adsorption on the surface of the substrate. A decrease in adhesive strength at greater oxidations of the polymer is explained by the cohesive strength deterioration of the PE subjected to irradiation with UV-light.
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