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Poly(urethane-imide)s (PUIs) were prepared by the Diels–Alder (DA) reaction of 5-(2-furanylmethylcarbamato)-1-[1-(2-furanylmethylcarbamatomethyl)]-1, 3, 3, -trimethylcyclohexane (FFCH) with various bismaleimides. The DA reaction was carried out in 1, 4-dioxane as the solvent as well as in bulk. This was followed by aromatization of the polytetrahydrophthalimide intermediate in the presence of acetic anhydride. All polymers were characterized by elemental analysis, IR spectral studies, and thermogravimetry. The PUIs exhibited moderate thermal stability. FFCH and bismaleimide were polymerized (at 145 ± 10°C) by an in-situ DA reaction into thermally stable PUIs-glass fiber composites (i.e., laminates) and were characterized by their chemical resistance and mechanical properties.
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Patel et al. (1995) studied this question.
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