Abstract
The relationship of the elastic modulus and loss tangent to the compositions for two series of thermoplastic polyurethane elastomers (ET and ES types) was investigated by the uniaxial extension method and dynamic mechanic analysis. The structure parameters (C100, C020 and C200) were determined by multilinear regression. At the same time, the process of chemical stress relaxation was carried out under a range of temperatures and at a given strain. The molecular parameters a, k, k3, [UNKNOWN]3 and activation energy ΔE3 were determined by a linear regression method. It was found that the results obtained from the theoretical equations were in good agreement with the experimental data.
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