Abstract:
The reaction of 4-phenylurazole (PHU) 1 with n-isopropylisocyanate 3 was
performed at room temperature and the resulting bis-urea derivative 4 was
obtained in high yield and it was finally used as a model compound for the
polymerization reaction . The step-growth polymerization reactions of monomer 1 with hexamethylene diisocyanate (HMDI) 5, isophorone (IPDI) B and
toluene-2,4-diisocyanate (TDI) 7 were performed in DMAc in the presence of
pyridine or triethylamine as a catalyst. The resulting novel polyureas have an
inherent viscosity in a range of 0 .04–0 .23 g dL 1 in DMF at 25 °C . These
polyureas were characterized by IR, 1 H NMR and elemental analysis .The
resulting polymers are soluble in most organic solvents. Some physical properties and structural characterization of these novel polyureas are reported.