Abstract
Novel aromatic polyamides were synthesized from 2,4′-biphenyldiamine by low-temperature solution polycondensation. The polyamides were soluble in pyridine, m-cresol, N,N-dimethylacetamide, 1-methyl-2-pyrrolidone, hexamethylphosphoric triamide, N,N-dimethylformamide, dimethylsulfoxide, and conc. H2SO4. The glass-transition temperatures (Tgs) were found in the 248—284°C range. The temperatures at 5% Weight loss in nitrogen atmosphere (Tds) were 435—459°C, and residual weights at 600°C were 43—56%. The introduction of 2,4′-biphenyldiyl structure to the backbones of aromatic polyamides improves solubility without lowering high thermal stability. In addition, brominated aromatic polyamides were synthesized from N,N′-bis(trimethylsilyl)-5-bromo-2,4′-biphenyldiamine, and their properties were compared with those of none-brominated polyamides. The brominated aromatic polyamides indicated higher solubility, though their Tgs Were as high as those of none-brominated polyamides. As concerns thermal decomposition behavior, the introduction of a bromo-group to the structures of aromatic polyamides lowered Tds, but heightened residual weight.
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Akutsu, F., Sugiyama, N., Ando, N. et al. Synthesis and Properties of the Aromatic Polyamides Containing the 2,4′-Biphenyldiyl Structure. Polym J 27, 1025–1032 (1995). https://doi.org/10.1295/polymj.27.1025
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DOI: https://doi.org/10.1295/polymj.27.1025
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