Projektbeskrivning

UV light in combination with oxygen seems greatly depleting many polymers and most used polymer materials could not be used without the addition of stabilizers. The ultraviolet light has a strong impact because its energy is of the same order of magnitude as binding energies between the atoms of the polymer molecules. Particularly low energy has the binding O-O of peroxides. The energy is absorbed by certain photoactive atomic groups, called chromophores that can either be part of the polymer itself, of a pollutant from the polymer preparation or subsequent manufacturing steps or included in the pigments, colorants or other additives in the material. Basic reactions in the photochemical degradation of polymers are carried out under the action of free radicals. Hydro peroxides in small amounts are present as an impurity in most hydrocarbon-based polymers, often formed by thermal oxidation in connection with production. Hydro Peroxides form under the action of ultraviolet light easy alkoxy radicals (ROH *), and hydroxyl radicals (OH *), which initiates the polymer degradation reaction. This reaction progresses (propagates) as a chain reaction under the action of oxygen. The reaction ends (terminates) if two radicals react with each other.

Askömoment

Uppställning av testsystem samt kontinuerlig körning av testsystemet. Uttag av provmaterial ur testenheterna kommer att ske kontinuerligt.

Kontaktperson

Magnus Carlsson, Wallenius Water AB, magnus.carlsson(at)walleniuswater.com