Abstract
AbstractA study was made of the preparation of aromatic polymeric amines in order to test their thermal stability. The most useful method was the hydrogenation of polymeric Schiff bases by the dimethylamine—borane reagent or the borane—tetrahydrofuran reagent. The Schiff bases were prepared by the solution polymerization of terephthalaldehyde with various aromatic diamines, including 4,4′‐methylenedianiline, benzidine, and p‐phenylenediamine, and for comparison, 1,6‐hexanediamine. The Schiff bases and the polyamines from the aromatic diamines were found to be dimers or trimers, not high polymers: the polymers from the aliphatic diamine had a degree of polymerization of about 14. Thermogravimetric analyses of the aromatic polyamines under nitrogen showed that the initial temperatures of marked degradation were 350–400°C.
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