Portal de Periódicos da CAPES

High‐temperature resins based on aromatic amine‐terminated bisaspartimides

1983; Wiley; Volume: 21; Issue: 1 Linguagem: Inglês

10.1002/pol.1983.170210125

1542-9369

Devendra Kumar, G. M. Fohlen, J. A. Parker,

Synthesis of Tetrazole Derivatives

Abstract Various 4,4′‐bis{ N 2 ‐[4‐(4‐aminophenoxy)phenyl]aspartimido}diphenylmethane (APADM)‐type precursors were synthesized by Michael‐type reaction of an aromatic bismaleimide (1mol) with an aromatic diamine (2 mol) in an aprotic solvent. The structures of these materials were characterized by using Fourier‐transform infrared (FT‐IR), 1 H nuclear magnetic resonance (NMR) and 13 C‐NMR; their curing behaviors and thermal stabilities were evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The thermal polymerization of APADM by heating it above its melting temperature produced a tough polymer. From these preimidized precursors, graphite‐fiber laminates were prepared and their mechanical properties evaluated. To elucidate the thermal curing mechanism and the structure of the polymer, a model compound, N ‐[4‐(4′‐aminobenzyl) phenyl] aspartimidobenzene was synthesized. The gas‐chromatographic mass spectra of these compounds has suggested a mechanism for their decomposition. The structure of the polymer also was studied by using FT‐IR and 1 H‐NMR.