Synthesis, physical and thermal characterization of phosphorus‐containing homopolymers and copolymers based on 2,4‐bis(4‐aminophenoxy)‐6‐diethoxyphosphinyl‐s‐triazine

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Abstract
Novel phosphorus‐containing homopolyimides, homopolyamides, and homopolyureas were prepared by reacting 2,4‐bis(4‐aminophenoxy)‐6‐diethoxyphosphinyl‐s‐triazine (BADT) with pyromellitic or benzophenone tetracarboxylic dianhydride, terephthaloyl chloride, and tolylene diisocyanate, respectively. In addition, the corresponding copolymers that contained approximately 3% phosphorus were prepared by reacting BADT and 4,4′‐diaminodiphenyl sulfone with the aforementioned reagents. These polymers were characterized by inherent viscosity measurements, infrared (IR) and proton nuclear magnetic resonance (1H‐NMR) spectroscopy as well as by differential thermal analysis (DTA) and dynamic thermogravimetric analysis (TGA). Their thermal properties were compared with those of the corresponding nonphosphorylated polymers. The copolymers were stable up to 233–272°C in nitrogen or air atmosphere. The homopolymers showed a relatively lower thermal stability. Furthermore, a model diimide, diamide, and diurea were synthesized from the reactions of BADT with phthalic anhydride, benzoyl chloride, and phenyl isocyanate, respectively. The physical and thermal characteristics of these model compounds were correlated with those of the corresponding homopolymers.
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