Probing effects of alternately-embedded phenoxy phenyl lateral groups on properties of novel aromatic poly(ether-urea)s

摘要

A new class of alternate aromatic poly (ether-urea)s having bulky phenoxy phenyl lateral groups was prepared by the reaction of 2,2′-bis[(p-phenoxy phenyl)]-4,4′-diaminodiphenyl ether (PPAPE) with two diisocyanates, isophorone diisocyanate and 2,4-tolylene diisocyanate. The limited viscosity values as well as M?_n and M?_w values of the resulting polymers were determined. The resulting poly(ether-urea)s could be easily cast into optically-transparent, flexible, and light color films. The cut-off wavelength values and the percentage of transmittance at 800 nm were found to be at about 415 nm and 85%, respectively. PPAPE-derived poly(ether-urea)s showed a low-crystallinity and had excellent solubility in polar organic solvents. T_(onset), T_g, T_(d5%), and T_(d10%) values of the PPAPE-derived polymers measured from their DSC and TGA thermograms were up to 270, 280, 315, and 340°C, respectively. Surface morphology of the resulted poly(ether-urea)s were also evaluated by their scanning electron microscopy images. Excellent organosolubility, satisfactory film quality, moderate T_g values, and good thermal stability make this class of poly (ether-urea)s promising high-performance polymeric materials.