Segmented polyether poly(urethane-ester) (PEUE) based on poly(tetramethylene oxide) (PTMO) Mω 1000

methylene-diphenyl-diisocyanate (MDI) and bis-hydroxpethyl-terephthalate (BHET) or its dimer (BHET-D) were synthesized

and their morphology and properties were characterized using FT-IR

dynamic mechanical analysis

differential scanning calorimetry (DSC) and tensile measurements.The results indicated that the microphase separated (PEUE) had higher mechanical strength and longer rubber plateau temperature range than those in conventional polyether polyure-thanes. Increasing hard segment content or length led to increasing tensile strength and pla-teau modulus

and decreasing the degree of phase separation between the hard and soft seg-ments. These features were considered due to the hard segments composed of high crystallizable

rigid aromatic esters while introducing ester groups in hard segments also enhanced compacti-bility with polyethe soft segments.