A series of poly(imide-amide)s were synthesized by interfacial condensation of carbomethoxy-iso/terephthaloyl chlorides (I) with aromatic diamines and polycyclic aliphatic diamines. Carbomethoxy-iso/terephthaloyl chlorides, containing approximately 50% para isomer and 50% meta isomer, were synthesized from trimellitic anhydride. The intermediates poly(amide-amic ester)s III had inherent viscosity of 0.1–0.36 dL/g. All poly(amide-amic ester)s were soluble in NMP, DMAc, DMF, and DMSO, except the polymer prepared from 1,6-diaminodiamantane. The poly(amide-amic ester)s were thermally treated to form poly(imide-amide)s. Most of poly(imide-amide)s showed amorphous patterns in x-ray diffraction studies. The glass transition temperatures of these poly(imide-amide)s were in the range of 255–319°C, and the 5% weight loss temperatures in TGA were in the range of 465–540°C in nitrogen. The poly(imide-amide)s (IVc and IVd) from polycyclic aliphatic diamines such as 1,3-diaminoadamantane and 1,6-diaminodiamantane, had good thermal stability, with the temperature at 5% weight loss above 465°C. The poly(imide-amide)s (IVc and IVd) also had high glass transition at 294° and 291°C, respectively.
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Yaw‐Terng Chern (1996) studied this question.