Synthesis, characterization, and acoustic properties of new soluble polyurethanes based on 2,2′-[1,4-phenylenebis(nitrilomethylylidene) diphenol and 2,2′-[4,4′-methylene-di-2-methylphenylene-1,1′- bis(nitrilomethylylidene)]diphenol

Abstract

Eight novel polyurethanes based on 2,2′-[1,4- phenylenebis(nitrilomethylylidene)]diphenol and 2,2′-[4,4′-memylene- di-2-memylphenylene-1,1′-bis(nitrilomethylylidene)]diphenol acting as hard segments with two aromatic and two aliphatic diisocyanates (4,4′- diphenylmethane diisocyanate, toluene 2,4-diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate) were prepared and characterized with Fourier transform infrared, UV spectrophotometry, fluorescence spectroscopy, 1H-NMR and 13C-NMR spectroscopy, thermogravimetric analysis, and differential thermal analysis. All the polyurethanes contained domains of semicrystalline and amorphous structures, as indicated by X-ray diffraction. The acoustic properties and solubility parameters were calculated with the group contribution method. © 2007 Wiley Periodicals, Inc.