Abstract
A novel class of polyimides, N-phenylated wholly aromatic non-cyclic polyimides, was synthesized by the low-temperature solution and two-phase phase-transfer catalyzed polycondensations of new aromatic bis(imidoyl chloride)s, N,N′-diphenylisophthalimidoyl chloride and N,N′-diphenylterephthalimidoyl chloride, with aromatic dicarboxylic acids, isophthalic acid and terephthalic acid. The resulting polyimides were all white in color and had reduced viscosities of 0.11–0.14 dl g−1. Compared with the conventional polyimides having cyclic imide structures, these N-phenylated non-cyclic polyimides exhibited better solubility in various organic solvents, reduced crystallinity and lower glass transition temperatures and thermal stability. The reduced viscosity of a typical polyimide decreased rapidly upon UV light irradiation, indicating the occurrence of photodegradation. Before the polymer synthesis, the effects of reaction medium, organic and inorganic bases and phase-transfer catalyst were studied on the solution and two-phase reactions of N,N′-diphenylisophthalimidoyl chloride with benzoic acid.
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Saegusa, Y., Inoo, A. & Nakamura, S. Synthesis and Characterization of N-Phenylated Wholly Aromatic Non-Cyclic Polyimides from N,N′-Diphenylphthalimidoyl Chlorides and Phthalic Acids. Polym J 25, 1099–1105 (1993). https://doi.org/10.1295/polymj.25.1099
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DOI: https://doi.org/10.1295/polymj.25.1099