Abstract
Novel polyurethane (PU) ionomers based on poly(teramethylene oxide) (PTMO) or poly(ethylene oxide) (PEO), with nonionic hard segments of varying length and flexible segments containing sodium ions (Na+), have been prepared and their structure–property relationships have been investigated. The structure and the morphology were studied by means of differential scanning calorimetry (DSC), infrared (IR) spectroscopy and small-angle X-ray scattering (SAXS). Ionic conductivity was studied by means of broadband dielectric relaxation spectroscopy (DRS, 10−2–109 Hz). PTMO-based ionomers are characterized by the coexistence of segment microphase separation and ionic group segregation morphologies. In the PEO-based ionomers, crystallization is observed at low hard segment content, with a tendency for crystallization to decrease upon hard segment extension. Values of ionic conductivity are in the range 10−7 S m−1 to 10−4 S m−1 at 323 K for PU ionomers based on PTMO and PEO, respectively. © 2000 Society of Chemical Industry
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