Abstract
The microphase-separated morphology in a series of well characterized polybutadiene polyurethanes with hydroxy-terminated polybutadiene (HTPBD) endcapped with 2,4-toluene diisocyanate (TDI) as the soft segment (SS) phase, and the combination of 2,4-toluene diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS) phase, has been investigated by transmission electron microscopy (TEM) and sorption studies using N 2, O 2 and CO 2. This system constitutes a model segmented polyurethane copolymer composed of amorphous rubbery and glassy domains. Evidence for the presence of phase separation is inferred from the scattering and phase contrast mechanisms of imaging. However, it is not possible to assign specific domain morphologies such as spherical, lamellar or cylindrical, based solely on the results of TEM. Complementary evidence of the domain presence is provided from the transport results; in particular, phase inversion and domain connectivity. Incomplete phase separation was indicated from the combined transport-morphology results for samples with less than 33 wt % hard segment.
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