engleski

Ageing of Solid Polyester - Based Polyurethane

The influence of the light, oxygen and humidity on solid polyurethane has been studied. The investigations were performed on polyurethane prepared from polyester and aromatic diisocyanate. The characterization of the samples before and after ageing in view of the structural changes, the course of the process photooxidative degradation and photocrosslinking as well of changes of mechanical properties has been done. The results obtained show that the process of photooxidative degradation followed a similar mechanism as with polyurethanes in solution. However, the intensity of degradation and oxidation is less in a solid polymer, than in solution and occurred at the polymer surface. Photocrosslinking is also present. After ageing the mechanical properties were found to be decreased.

solid polyurethane; solution; polyester; ageing; mechanism; photooxidative degradation

nije evidentirano