Abstract
The synthesis and characterization of a novel series of soluble polyimides based on alkyldiaminobenzophenone (ADBP) having long chain linear alkyl groups with 9—14 carbon atoms are described. Polyimides containing tetracarboxylic dianhydrides such as 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and ADBP with even number carbon atoms were soluble in polar solvents such as N-methyl-2-pyrrolidone (NMP), while polyimides containing BTDA and ADBP with odd number carbon atoms (ADBP-9, 11, 13) were insoluble in NMP. These unique odd-even effects of solubility were assumed due to the conformational effects of long chain linear alkyl groups. Soluble copolyimides based on ADBP with conventional aromatic diamine, diaminodiphenylether (DDE) can be obtained. The incorporation of DDE resulted in increment of molecular weight and improve the thermal stability. Soluble polyimides and copolyimides based on ADBP were soluble in various polar solvents and exhibited high thermal stability in air and nitrogen.
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Tsuda, Y., Kawauchi, T., Hiyoshi, N. et al. Soluble Polyimides Based on Alkyldiaminobenzophenone. Polym J 32, 594–601 (2000). https://doi.org/10.1295/polymj.32.594
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DOI: https://doi.org/10.1295/polymj.32.594