Hydroxyl telechelic natural rubber-based polyurethane: Influence of molecular weight on non-isothermal cure kinetics - Le Mans Université Accéder directement au contenu
Article Dans Une Revue Thermochimica Acta Année : 2015

Hydroxyl telechelic natural rubber-based polyurethane: Influence of molecular weight on non-isothermal cure kinetics

Résumé

Isoconversional analysis was applied to non-isothermal bulk cure kinetics of uncatalyzed polyurethane (PU) resins based on telechelic hydoxyl natural rubber (HTNR) and poly[(phenyl isocyanate)-co-formaldehyde] (P-MDI). The dependency of apparent activation energy on conversion led to the identification of two different kinetic models, each involving two activation energies: a phenomenological model based on the Kamal–Sourour equation with non integer reaction exponents; and a new semi-mechanistic model assuming a main second order reaction between alcohols and isocyanates forming urethane linkages and a secondary reversible reaction forming allophanates that is known to become significant above 120 °C. Such a model based on mechanistic considerations allowed us to explain the variations of reactivity of the HTNR polyols with its average molecular weight.
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Dates et versions

hal-01620644 , version 1 (20-10-2017)

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Thi Kieu Nhung Tran, Gael Colomines, Arnaud Nourry, Jean-François Pilard, Rémi Deterre, et al.. Hydroxyl telechelic natural rubber-based polyurethane: Influence of molecular weight on non-isothermal cure kinetics. Thermochimica Acta, 2015, 620, pp.51 - 58. ⟨10.1016/j.tca.2015.10.006⟩. ⟨hal-01620644⟩
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