✍ Scribed by Kumar, Devendra ;Fohlen, George M. ;Parker, J. A.
No coin nor oath required. For personal study only.
4,4′‐Bis(N^2^)‐{4‐[4‐(2,3‐bicyclo‐[2.2.1]hept‐5‐ene‐dicarboximido)phenoxy]‐phenyl(‐aspartimido)‐di‐phenyl ether (2NAD/1020) and various similar polymer percursors were synthesized from bismaleimides by the Michael addition of two moles of aromatic diamine followed by end capping of the resultant amino‐terminated bisaspartimide groups with nadic anhydride. These precursors were characterized by using Fourier‐transform infrared (FT‐IR), proton, and carbon‐13 nuclear magnetic resonance spectroscopies (^1^H‐ and ^13^C‐NMR). Thermal polymerization of 2NAD/1020 by heating it above its melting point gave a reddish brown thermoset polymer. The curing behavior and thermal stability of these nadimides were evaluated by differential scanning calorimetry and thermogravimetric analysis studies. Graphite fiber laminates were prepared from these polymer precursors and their mechanical properties evaluated. Gas Chromatography/Mass Spectra of the precursors and thermosets have given an understanding of their decomposition behavior. The structures of the thermosets were examined by FT‐IR spectroscopy.
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