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Article Dans Une Revue Polymer Engineering and Science Année : 2004

Curing kinetics and chemorheological analysis of polyurethane formation

Résumé

The cross-linking kinetics and the rheological behavior of a polyurethane system during curing are investigated by DSC and small amplitude oscillatory shear rheometry. In this study, isoconversional methods are applied to understand the reaction complexity. The activation energy depends on the extent of conversion. It can be shown that three parallel reactions occur during the evolution of the global reaction in non-isothermal conditions. An original multi-step model can involve these three parallel independent reactions. Dynamic viscosity is measured as a function of time and is found independent of shear rate. Isothermal viscosity rise is related to reaction extent by a phenomenological model. The gelation time is deter-mined by the tanδ crossover at different frequencies

Domaines

Matériaux

Dates et versions

hal-00574737 , version 1 (08-03-2011)

Identifiants

Citer

François Dimier, Nicolas Sbirrazzuoli, Bruno Vergnes, Michel Vincent. Curing kinetics and chemorheological analysis of polyurethane formation. Polymer Engineering and Science, 2004, 44 (3), pp.Pages 518-527. ⟨10.1002/pen.20046⟩. ⟨hal-00574737⟩
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