Preparation of the polyurethane in alifatic structure containing carbonhydrate and investigation of the reological behaviors

Polyurethanes have become increasingly important polymeric materials due to their both mechanical and physical properties and also biocompatibilities. In the scope of this thesis, it was aimed to synthesize and characterize biocompatible polyurethanes by using carbohydrate-based polyols (glucose, maltose, starch), aliphatic diisocyanate (hexamethylenediisocyanate) and, two different types of polyethylene glycol (PEG200 and PEG400) for flexibility. The synthesized polyurethanes are structurally defined by FTIR, TGA and DSC analyses. In addition, the viscoelastic behaviors of the obtained polyurethanes was determined by rheological characterization in order to determine whether they are suitable for application areas. In general, the storage moduli of HMDI-PEG200 and HMDI-PEG400 polyurethanes which were synthesized at 25 ºC by 5, 10 and 15% masses were found to be larger than the lost moduli (G' > G''). This result shows that the elasticity increases as the polyol concentration increases. In the polyurethane synthesis using HMDI-PEG200, the mean storage moduli for glucose, maltose and starch having the concentration value of 15% were respectively 1.32×〖10〗^6, 1.07×〖10〗^6 ve 6.37×〖10〗^5 Pa. This result indicates that the highest storage modulus was obtained for the samples containing glucose. As a result, it has been found that the synthesized polyurethane samples with high elasticity in our work is structurally suitable for the coating purposes of biomedical areas..