Abstract
An imide-containing dicarboxylic acid, 2,2-bis[4-(4-trimellitimidophenoxy)phenyl]-hexafluoropropane (I), was prepared by the condensation of 2,2-bis[4-(4-aminophenoxy)phenyl]-hexafluoropropane and trimellitic anhydride. A series of new hexafluoroisopropylidene-containing poly(amide-imide)s having inherent viscosities of 0.64–1.44 dL/g were prepared by the direct polycondensation of diimide-diacid I with various long-chain aromatic diamines using triphenyl phosphite and pyridine as condensing agents in N-methyl-2-pyrrolidone in the presence of calcium chloride. Most of the resulting poly(amide-imide)s were noncrystalline and showed good solubility in polar organic solvents. Almost all polymers afforded transparent, flexible, and tough films. The 10 % weight loss temperatures of these polymers were all above 499 °C, and the glass transition temperatures were in the range of 203–277 °C.
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Yang, CP., Hsiao, SH. & Hsiao, HC. Thermostable soluble aromatic poly(amide-imide)s having hexafluoroisopropylidene and ether links in the main chain. J Polym Res 8, 91–98 (2001). https://doi.org/10.1007/s10965-006-0138-4
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DOI: https://doi.org/10.1007/s10965-006-0138-4