AbstractCorrelations between the macroscopic bulk polymer properties storage modulus (E′) and loss modulus (E″) and the microscopic property of cross‐polarization as represented by the time constantTCHhave been established for a series of polyurethane elastomers. The dependence ofE′,E″, andTCHas a function of molecular weight, rigid domain concentration, and temperature are graphically presented as a series of log plots. An experimental relationship is presented that shows that the distribution of motions of the flexible domains appears to be the major factor in the success of these cor
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