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Synthesis of New Polyureas Drived from 4-(4-N-Trimellitylimidophenyl)-1,2,4-triazolidine-3,5-dione


4-(4"-Aminophenyl)-1,2,4-triazolidine-3,5-dione (1) was reacted with trimellitic anhydride (2) in refluxing DMF (N,N-dimethylformamide) and gave 4-(4"-N-trimellitylimidophenyl)-1,2,4,-triazolidine-3,5-dione (NTMPTD) (3) in high yield and purity. This compound was characterized by IR,1 H NMR and elemental analysis. Solution polycondensation reactions of monomer 3 with hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IPDI) were performed in DMSO in the presence of pyridine as a catalyst and lead to the formation of novel aliphatic polyureas. The polymerization reaction with tolylene-2,4-diisocyanate (TDI) gave novel aromatic polyurea. These novel polyureas have inherent viscosities in a range of 0.11-0.21 dLg-1 in DMF at 25 ° C. Some structural characterization and physical properties of these novel polymers are reported.


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