Abstract
Ten polyether-urethane thermoplastic elastomers of varying chemical structure have been characterized by dielectric spectroscopy and scanning calorimetry. In the temperature range corresponding to the glass-rubber transition of the predominantly polyether phase, modification of the primary dielectric transition and the occurrence of a second transition at somewhat higher temperature have been observed. Through comparison with calorimetric data, these events have been related to supercooling of crystallizable polyether segments. Supercooling suppresses dielectric loss processes in some regimes and enhances losses in others. By systematic variation of chemical structure these phenomena have been classified.
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Vallance, M.A., Yeung, A.S. & Cooper, S.L. A dielectric study of the glass transition region in segmented polyether-urethane copolymers. Colloid & Polymer Sci 261, 541–554 (1983). https://doi.org/10.1007/BF01526619
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DOI: https://doi.org/10.1007/BF01526619