Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   January-February 2004 , Volume 13 , Number 1; Page(s) 29 To 38.
 
Paper: 

MICROWAVE-INDUCED AND HIGH TEMPERATURE SOLUTION POLYMERIZATION OF 4-(4'-T-BUTYLPHENYL)-1,2,4-TRIAZOLIDINE-3,5-DIONE WITH DIISOCYANATES

 
 
Author(s):  MALAKPOUR SH.*, REZAZADEH S.
 
* Organic Polymer Chemistry Research Laboratory, College of Chemistry, Isfahan University of Technology, Isfahan-84156, I.R. Iran
 
Abstract: 

4-(4¢-tert-Butylphenyl)-1,2,4-triazolidine-3,5-dione, 4-(4¢-tert-butylphenyl)urazole (TBPTD) was prepared from 4-tert-butylbenzoic acid in 5 steps. TBPTD was reacted with n-propylisocyanate in dry N,N-dimethylformamide and the resulting bisurea derivative was obtained in high yield and was finally used as a model for polymerization reaction. The step-growth polymerization reactions of monomer TBPTD with hexamethylene diioscyanate, isophorone diioscyanate and toluene-2,4-diioscyanate were performed in N,N-dimethylacetamide solution in the presence of pyridine, triethylamine or dibutyltin dilurate as a catalyst. The step-growth reactions were performed under microwave irradiation as well as high temperature solution polymerization. The polycondensation proceeded rapidly, compared with the conventional solution polycondensation and was almost completed within 10-18 min. The resulting novel polyureas have an inherent viscosity (hinh) in a range of 0.025-0.306 dL/g in DMF or sulphuric acid at 25°C. These new polyureas were characterized by IR, 1H NMR, elemental analysis and TGA. Some physical properties and structural characterization of these novel polyureas are reported.

 
Keyword(s): 4-(4 -TERT-BUTYLPHENYL)URAZOLE, POLYUREAS; INHERENT VISCOSITY, STEP-GROWTH POLYMERIZATION, THERMAL PROPERTIES, THERMOGRAVIMETRIC ANALYSIS (TGA), MICROWAVE
 
References: 
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