Abstract
A series of poly(amide-imide)s has been synthesized by the direct polycondensation of biphenyl imide containing diacids with aromatic diamines using triphenylphosphite (TPP) as the condensation agent in a N-methyl-2-pyrrolidone (NMP)-pyridine solution containing 3.5 wt% LiCl. The direct polycondensation was markedly facilitated to give high-molecular-weight (0.24<ηinh<2.38) of poly(amide-imide)s in quantitative yield. The thermal properties of the obtained poly(amide-imide)s were examined by DSC and TGA. The synthesized poly(amide-imide)s possessed glass transition temperature in the range of 285–337°C. The poly(amide-imide)s exhibited excellent thermal stabilities and had 10% weight loss at the temperature in the range of 475–597°C under nitrogen atmosphere. With the exception of polymer BP-2 series, the poly(amide-imide)s showed good solubility in NMP, N,N-dimethylformamide (DMF), and dimethyl sulfoxide (DMSO).
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Chan, KC., Chang, TC. Synthesis and Properties of Thermally Resistant Poly(amide-imide)s. Polym J 30, 897–903 (1998). https://doi.org/10.1295/polymj.30.897
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DOI: https://doi.org/10.1295/polymj.30.897
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