Poly‐<i>as</i>‐triazines

Abstract

Abstract Two high molecular weight (η inh &gt; 1.0) soluble poly‐ as ‐triazines have been prepared by the solution polycondensation in m ‐cresol of 2,6‐pyridinediyl dihydrazidine with p , p ′‐oxybis(phenyleneglyoxal hydrate) and with p , p ′‐oxydibenzil. Thermal characterization of the poly‐ as ‐triazines by TGA showed polymer decomposition temperatures of ∼400°C after a 300°C cure in argon. Poly‐ as ‐triazines exhibited weight losses &lt;8% after aging in static air at 316°C for 200 hr. Clear yellow films cast for m ‐cresol solutions exhibited good flexibility and toughness even after aging at 316°C for 200 hr in air and after refluxing in 10% aqueous potassium hydroxide solution for 24 hr.