Synthesis, Characterization and Glass Reinforcement of Poly [Urethane-Imide] S

Abstract

Poly (urethane-imide)s (PUIs)were prepared by the by the intermolecular Diels-Alder (DA) Reaction of Hexamethylene bis(2-Furanylmethythioethyl carbamate) (HMFTC) with various bismaleimides. The DA reaction was carried out in 1, 4 – dioxane as a solved as well as in bulk, followed by aromatization of tetrahydrophthalimide intermidiates in the presence of acitic anhydride. All the polymers were characterized by elemental analysys, IR spectral studies and thermogravimetry. The PUIs exhibit moderate thermal stability. HMFTC and bismaleimides were polymerized (at 145 + 10 0C) by an “in situ” DA intermolecular reaction into moderately thermally stable PUIs glass-fibre composite (i.e. laminates) and were characterized by their chemical resistance and mechanical properties.