Synthesis and charaterization of new arowmatic polymers containing long alkyl side chains and 1,3,5‐triazine rings

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Abstract
A series of new aromatic polyamides, polyimides, and polyureas containing 1,3,5‐triazine rings in the main chain and two flexible long side chains for each unit, were prepared by the reaction of 2‐(N‐phenyl‐N‐octadecylamino)‐4‐(N‐aminophenyl‐N‐octadecylamino)‐6‐aminophenyl‐1,3,5‐triazines with aromatic diacid chlorides, pyromellitic dianhydride, and diisocyanates, respectively. These polymers were soluble in tetrahydrofuran, chloroform, and benzene, but had poor solubility in polar aprotic solvents such as dimethyl sulfoxide and N,N‐dimethylformamide. These polymers were stable up to 410°C for polyamides, 430°C for polyimides, and 290°C for polyureas in air. The differntial scanning calorimetric studies of the polymers indicated that the degree of side‐chain crystallinity based side chain was 6‐10%.