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Rhéologie des polymères fondus à hauts taux de cisaillement : application à la microinjection

Abstract : Rheology at high shear rate for both polymers, semi-crystalline HDPE and amorphous PMMA was studied. Classical rheometry tools, plane-plane dynamic mode rheometer and capillary rheometer, were used in extreme conditions (with channels diameters for capillary rheometry up to 0.3 mm). However, analyses of these results were made following conventional assumptions neglecting instabilities and physical phenomena involved in these flows.We then developed a mathematical model of a capillary flow in to reflect the importance of different physical phenomena that can occur in extreme flows, namely heating, pressure dependency of viscosity, compressibility and the wall slip. The results of the developed model were compared with experimental results.We helped develop a press microinjection original and we tested it with instrumented plate mold with thickness up to 0.2 mm. We have shown that it is possible to make quality parts which are proven by well reproducible pressure, speed and temperature measurements. We used the experimental rheological data in filling phase modeling with the calculation software Rem3D. Correlations between experimental measurements and calculations were carried out by comparing the pressure in the filling system and the cavity.
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  • HAL Id : pastel-00820185, version 1

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Cheima Mnekbi Djebali. Rhéologie des polymères fondus à hauts taux de cisaillement : application à la microinjection. Autre. Ecole Nationale Supérieure des Mines de Paris, 2012. Français. ⟨NNT : 2012ENMP0038⟩. ⟨pastel-00820185⟩

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