Investigation on the structure-property-relations of segmented polyurethane elastomers based on naphthalene-1,5-diisocyanate

Polyurethane (PUR) elastomers based on Naphthalene-l,5-diisocyanate (NDI) a re outstanding for their high performance in particularly demanding dynamic applications. For a better explanation and an understanding of their prope rties, suitable model systems for the technically relevant NDI-elastomers i n the form of molecularly uniform oligourethanes and PUR-elastomers with un iform hard segments were synthesized and characterized. Detailed investigat ions of the microphase separation, the melting behavior, the thermal stabil ity the hydrogen bonding behavior and the mechanical properties showed that the hard segment, built by the naphthalene bisurethane units with their ri gid structure and their high melting points were responsible for the unusua l material properties.