A Study on the Relationships between Network Structure and Mechanical Properties of Interpenetrating Polymer Networks-Part 2: The Comparison of the Theory of Viscoelasticity for Thermoplastic Polyurethane Elastomers with Experiments

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.