Abstract
Poly(urethane-imide)s were prepared using a new method based on Michael addition and elimination reactions of bis(nitroethyl)urethane oligomers (PUNO2) with bismaleimides. The bis(nitroethyl)urethane oligomers were synthesized from poly(tetramethylene oxide) glycol of molecular weight 650, 1000, 1500 and 2000 (Terathane 650, 1000, 1500 and 2000), 1,6-hexamethylene diisocyanate (HMDI) or dibenzyl diisocyanate (DBDI), and 2-nitroethanol, in the molar ratio of 1:2:2, in solution. The poly(urethane-imide)s were characterized using Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR) spectroscopies, thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), contact angle measurements, and mechanical analysis. The dynamic contact angles of the cast films of these polymers were influenced by the molecular weight of the poly(tetramethylene oxide) glycol and the hard segment of the polyurethanes. Static mechanical measurements showed greater strength at break and modulus for the obtained poly(urethane-imide)s (PUI), the modulus being even ten times higher than that of PUNO2 when using aryl diisocyanate.
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