Abstract
AbstractA novel high molecular weight (ηinh = 1.4 dl/g) polyquinazolotriazole (PQT) was prepared from the reaction of 3,3′‐(2″,6″‐pyridinediyl)bis[5‐(o‐aminophenyl)‐1,2,4‐triazole] with isophthalic acid by solution cyclopolycondensation in polyphosphoric acid, with diphenyl isophthalate by melt polycondensation, and with isophthaloyl chloride to form a precursor polyamide which subsequently underway cyclodehydration. Thermal characterization of the PQT by thermogravimetric analysis showed initial weight loss in air commencing at ∼490°C. The PQT exhibited a weight loss of only 4% after aging in static air for 200 hr at 316°C and a Tg of 342°C as measured by differential scanning calorimetry. Prior to polymer synthesis, a series of model compounds was prepared as a guide to polymer synthesis and identification.
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