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Français : Courbe de viscosité d'un mastic base époxyde montrant la rhéofluidification de la résine époxyde fondue.

La courbe de viscosité s’obtient en portant la viscosité dynamique en fonction du taux de cisaillement.
Essai dynamique (géométrie supérieure en oscillation) réalisé au moyen d'un rhéomètre dynamique. Balayage en fréquence imposé de 100 à 10 Hz (variation logarithmique). Isotherme : 80 °C.
Faible déformation (0,01 %) pour effectuer des mesures dans le domaine linéaire de viscoélasticité.
Géométrie plan/plan (plateaux parallèles) plus adaptée que cône-plan car le matériau polymère testé est chargé ; entrefer : 700 µm.
Durée totale de la mesure : environ 5 min.
La viscosité complexe µ* (mesure en oscillation) est comparable à la viscosité µ en rotation.
Un domaine fréquenciel est comparable à un domaine de vitesse de sollicitation. Le gradient de vitesse est proportionnel à la fréquence.

Paramètres de la mesure par oscillation : voir fichier ci-dessous.
English: Viscosity curve of epoxy-based sealer at 80 °C showing the shear thinning of the molten epoxy resin.

Using a dynamic rheometer.
Frequency: from 100 to 10 Hz (log variation).
Plate/plate geometry - gap: 700 µm.
Deformation: 0.01 %.
The complex viscosity µ* (oscillation measurement) is comparable to the viscosity µ (rotation measurement).
The velocity gradient is proportional to the frequency.

Oscillation test parameters: see file below.
Date
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Author Cjp24
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Oscillation test parameters

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