Synthesis of polyamides from pseudo dibenzoylphthaloyl chlorides and aliphatic diamines

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<jats:title>Abstract</jats:title><jats:p>New pseudo dibenzoylphthaloyl chlorides, namely, 2,5‐dibenzoylterephthaloyl, 4,6‐dibenzoylisophthaloyl, and 4,6‐di(<jats:italic>p</jats:italic>‐toluyl)isophthaloyl chlorides, were synthesized as monomers. The ring‐opening polyaddition reaction of the pseudo dibenzoylphthaloyl chlorides with aliphatic diamines in <jats:italic>N</jats:italic>‐methyl‐2‐pyrrolidone afforded a new class of polyamides having inherent viscosities of 0.2 ∼ 0.6 in quantitative yield. The solution polymerization was almost completed within 30 min at room temperature. All of the polyamides were soluble in a wide range of solvents including tetrahydrofuran. These polymers began to decompose at around 300°C both in air and under nitrogen as determined by differential thermal analysis (DTA) and thermogravimetric analysis (TGA).</jats:p>

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