Abstract
AbstractDifferential scanning calorimetry, dynamical mechanical, and spin probe measurements were conducted to study relaxation and soft‐segment crystallization phenomena in block copoly(ether‐ester) elastomers obtained through transesterification and melt polycondensation of dimethyl terephthalate, 1,4‐butanediol and poly(ethylene oxide). The elastomers investigated differed both in molecular weight of the poly(ethylene oxide) used as well as in their ratio of hard to soft segments. It was found that a crystallization process of the soft‐segment phase does not occur for oligoethers with a molecular weight lower than 1000. The spin probe method can be used to monitor the melting process and additionally it supplies information on the relaxation processes taking place in the amorphous part of the soft phase. Some data on the crystallization of the rigid phase are also given.
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