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4805692 
Journal Article 
Synthesis of new polyureas derived from 4-(4 '-N-trimellitylimidophenyl)-1,2,4-triazolidine-3,5-dione 
Mallakpour, SE; Nasr-Isfahani, H 
2002 
Yes 
Iranian Polymer Journal
ISSN: 1026-1265 
11 
1 
57-61 
English 
WOS:000175399000003 
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, H-1 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 degreesC. Some structural characterization and physical properties of these novel polymers are reported. 
polyurea; step-growth polymerization; inherent viscosity; 4-(4 '-N-trimellitylimidophenyl)-1,2,4-triazolidine-3,5-dione