Abstract
New comb-like aromatic polyamides, polyimides, and polyureas containing the 1,3,5-triazine ring with two long alkyl groups in the side chain (DA18-polymers) were synthesized by the reaction of m-phenylene diamine derivative, that is, 2,4-bis(N-octadecylanilino)-6-(3,5-diaminophenyl)-1,3,5-triazine (DA18) with aromatic diacid chlorides, pyromellitic dianhydride, and diisocyanates. Making reference to DA18-polymers, the DA-polymers without long alkyl chains were also prepared by the reaction of 2,4-dianilino-6-(3,5-diaminophenyl)-1,3,5-triazine (DA) with the above comonomers, respectively. The DA18-polymers were soluble in tetrahydrofuran, chloroform and toluene, but insoluble in polar aprotic solvents. The DA-polymers were stable up to 430°C for polyamides, 480°C for polyimide, and 300°C for polyureas. DA18-polymers with long alkyl groups showed lower thermal stability than DA-polymers. The DA18-polymers showed side-chain crystallization based on long alkyl groups, and the degree of crystallinity was found to depend on the main chain structure.
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Lin, JK., Yuki, Y., Kunisada, H. et al. Synthesis and Characterization of New Comb-Like Aromatic Polyamides, Polyimides, and Polyureas Containing 1,3,5-Triazine Rings in their Side Chains. Polym J 21, 709–717 (1989). https://doi.org/10.1295/polymj.21.709
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DOI: https://doi.org/10.1295/polymj.21.709