Abstract
Dynamic oxygen permeation measurements are carried out on films cast from solutions and emulsions of polyurethane (PU) cationomers. For the former, ionization leads to the permeation coefficients P at 20–40°C (below the glass transition temperature of the hard domains, T gh) being higher than those at 50–70°C (above T gh) by a factor of about 10 2. This is opposite to the results observed for normal homopolymers and un-ionized PU. For the latter, dispersion leads to a drop in P at 20–40°C and an increase in P at 50–70°C. These variations in P correlate quite well with the variation in morphology resulting from ionization and dispersion.
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