STRUCTURE PROPERTY RELATIONSHIPS OF POLYURETHANE-BASED MATERIALS (PUPA) FOR APPLICATIONS IN BIOMEDICINE

Polyurethane poly(amido-amine) (PUPA) is a modified polyurethane whose chains are crosslinked with those of a tertiary aminic polymer [poly (amido-amine) (N2LL)] by the bifunctional agent hexamethylenediisocyanate (HMDI). PUPA is capable of complexing heparin; a behavior that is related to the presence of poly (amido-amine). The effect of the chemical composition of the starting mixture and / or the reaction time on the morphology and physical properties was studied by using differential scanning calorimetry, dynamic mechanical experiments, x-ray, scanning electron microscopy, and Fourier transform infrared attenuated total reflection analyses.