PREPARATION OF POLYURETHANE MICROSPHERES BY ELECTROSPRAY TECHNIQUE

In this paper some polyurethane membranes were prepare by electrospraying process to obtain biocompatible materials. The polyurethanes utilized in this study were synthesized from hexamethylene diisocyanate (HDI), polytetramethylene ether glycol (PTMEG) and butanediol (BD) filled with different proportion of hydroxypropyl cellulose (HPC), by polyaddition in dimethylformamide (DMF) as solvent. Molar ratio of Polyether: Diisocyanate: Glycol of 1:4:3, provide a concentration of urethane groups about of 3x10 -3 mole/g. These polyurethane membranes were made by electrospraying technique from a solution of 20% w/w, at 25 kV voltages and a distance between needle and ground collector about of 15 cm. The structure of polymers was confirmed by Fourier transform infrared spectroscopy (FT-IR) analysis. The morphology of electrospun membranes were analyzed by scanning electron microscopy (SEM). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used for thermal characterization. Contact angles measurements in connection with the study for biological behaviour was performed