FTIR-ATR characterization of a new biomaterial capable to adsorb high quantity of heparin

By using different ratios of polyurethane (Pellethane 2363-80A), poly(amidoamine) (N₂LL) and hexamethylene diisocyanate, several materials (PUPA) with a continuous variation of mechanical properties and different quantities of nitrogen groups have been synthesized [1]. FTIR-ATR spectra of these materials have been recorded on both faces, the one in contact with the air and the other in contact with the glass. By comparing the spectra of the same face obtained for the different materials strong variations in the region between 1800 and 1500 cm^–1 can be observed. These differences can be correlated to the different ratios of poly(amidoamine) and hexamethylene diisocyanate used for the synthesis. In some cases the two faces show also significant differences in the FTIR spectra.