EFFECT OF POLYESTER SIDE-CHAINS ON THE PHASE SEGREGATION OF POLYURETHANES USING SMALL-ANGLE X-RAY-SCATTERING

Small-angle X-ray scattering and differential scanning calorimetry wer e used to study the morphology in segmented polyester-based polyuretha nes with 4,4'-methylene bis(phenyl isocyanate) and butanediol as hard segment. The polyesters with various mole ratios of -CH3 side chain we re synthesized from adipic acid and glycols which were mixtures of var ious mole ratios of hexanediol and 1,2-propanediol. The effect of -CH3 sidechain content in polyesters on the phase segregation of soft-and hard-segments of polyurethanes at two annealing temperatures, i.e. 25 and 87 degrees C, was observed. (C) 1998 Elsevier Science Ltd. All rig hts reserved.