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Viscoelastic analysis of a polyurethane thermosetting resin under relaxation and at constant compression strain rate

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Abstract

The evolution of the viscoelastic behaviour of a polyurethane resin was investigated on the basis of uniaxial compression tests in stress relaxation and at constant strain rate. Both methods were applied to PUR specimens whose curing cycle was interrupted at different steps. The experimental data were precisely modelled in terms of a three-parameter constitutive equation whose general form was derived from the Kohlrausch relaxation law. The viscoelastic behaviour was followed during the cross-linking process and during the final cooling ramp. A close correlation was found between the degree for cross-linking and the elastic modulus increase during the curing period. Furthermore, it was stated that the evolution of the viscoelastic parameters during the cooling phase describes in a quantitative way the construction of the glassy behaviour and that it controls the development of internal stresses in PUR mouldings.

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Authors and Affiliations

  1. Laboratoire de Physique du Solide (U.A. CNRS 155), Ecole Nationale Supérieure des Mines de Nancy, Parc de Saurupt, 54042, Nancy cedex, France

    Y. Leterrier & C. G'sell

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  1. Y. Leterrier
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  2. C. G'sell
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Leterrier, Y., G'sell, C. Viscoelastic analysis of a polyurethane thermosetting resin under relaxation and at constant compression strain rate. J Mater Sci 23, 4209–4216 (1988). https://doi.org/10.1007/BF00551910

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