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

Nita R. Patela, Kanu D. Patelb and Jayanti M. Darajia*

¹Department of Chemistry, Smt. M.G. Panchal Science College, Pilvai- 382 850 (India) ²Department of Chemistry, V.P. and R.P.T.P. Science College, Vallabh Vidyanagar- 388 120 (India)  

Poly(urethane-imide)s (PUIs) were prepared by the intermolecular Diels-Alder (DA) reaction of Hexamethylene bis (2-furanylmethyloxyethylcarbamate) (HMFC) with various bismaleimides. The DA reaction was carried out in 1,4-dioxane as a solvent as well as in bulk, followed by aromatization of tetrahydrophthalimide intermediates in the presence of acetic anhydride. All the polymers were characterized by elemental analysis, IR spectral studies and thermogravimetry. The PUIs exhibit moderate thermal stability. HMFC and bismaleimides were polymerized (at 145 ± 10°C) 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."

Glass fibre; Reinforcement; Polyurethane imides