Synthesis and characterization of novel polyurethanes based on 2,6‐bis(4‐hydroxybenzylidene) cyclohexanone hard segments

Abstract

AbstractFour novel polyurethanes (PUs) containing 2,6‐bis(4‐hydroxybenzylidene) cyclohexanone hard segments with four diisocyanate, namely, 4,4′‐diphenylmethane diisocyanate, toluene 2,4‐diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate, were prepared. Structural elucidation and thermal characterization of these PUs were done by Fourier transform infrared, UV, and fluorescence spectroscopy, 1H‐NMR, 13C‐NMR, and differential thermal analysis/thermogravimetric analysis. All of the PUs contained domains of semicrystalline and amorphous structures as indicated by X‐ray diffraction. PUs were soluble in polar aprotic solvents such as N‐methyl‐2‐pyrrolidone, dimethylformamide, and dimethyl sulfoxide. Acoustic properties were calculated from the group contribution method. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007