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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   July-August 2004 , Volume 13 , Number 4; Page(s) 307 To 315.
 
Paper: 

SYNTHESIS AND CHARACTERIZATION OF NEW AROMATIC POLY(AMIDE-IMIDE-UREA)S DERIVED FROM BIS(4-TRIMELLITIMIDOPHENYL) UREA AND VARIOUS AROMATIC DIAMINES

 
 
Author(s):  BANI HASHEMI A.*, TAMAMI B., ABD ALMALEKI A.
 
* Department of Chemistry, College of Sciences, Shiraz University, Shiraz-71454, I.R. Iran
 
Abstract: 

New aromatic poly(amide-imide-urea)s with enhanced thermal stability and high inherent viscosities were synthesized from a new bis(4-trimellitimidophenyl) urea (I) and aromatic diamines. The bis(4-trimellitimidophenyl) urea (I) was readily obtained by the condensation reaction of bis(4-aminophenyl) urea with trimellitic anhydride. Polymers were prepared by direct polycondensation reaction using triphenyl phosphite in N-methyl-2-pyrrolidone (NMP)/pyridine solution containing dissolved CaCl2. The obtained poly(amide-imide-urea)s showed high thermostability. Their decomposition temperatures at 10% weight loss in nitrogen atmosphere were above 515 C and the anaerobic char yield at 800?C ranged from 45 to 65%. Almost all the poly(amide-imide-urea)s showed high glass transition temperature above 205 C by differential scanning calorimetry (DSC) measurements. These polymers were readily soluble in various organic solvents and could be cast into transparent, tough, and flexible films.

 
Keyword(s): AROMATIC POLYIMIDES, POLY(AMIDE-IMIDE-UREA), AROMATIC DIAMINES, DIRECT POLYCONDENSATION, THERMAL STABILITY
 
References: 
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