engleski

Ultraviolet Degradation of Polyester-Based Polyurethane

The structural changes after ageing of polyurethanes by UV irradiation has been studied by comparative spectroscopic measurements. The polyurethane was prepared from diphenylmethane-4, 4'-diisocyanate, (MDI) and polyester from adipic acid and ethylene glycol. The experimental results show that various ixidized structures are formed in UV degraded samples with simultaneous decomposition of polyurethane. This leads to the formation of new structures such as carbonyl, azo, carbodiimide, quinoid as well as polyene sequences. According to the experimental results and the data taken from the literature, the mechanism of the process was discussed.

polyurethane; ageing; oxidized structures

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