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Injection de systèmes réactifs : détermination de lois cinétiques et rhéologiques et modélisation

Abstract : The behaviour of two reactive systems, a natural rubber's formulation and a thermoset polyurethane (PU), is studied in the aim of modelisation. Some new methodologies of characterization are suggested to perform the quality of the measures. Various techniques are used in order to characterise the reaction kinetic of PU as the differential scanning calorimetry (DSC) or the titration. Isoconversionnal analysis shows three kinetic reactions which give a 3D network. Kinetic model used here is the addition of three Piloyan models. Techniques used to study natural rubber kinetic are rheometry, DSC and swelling. The simple model called Isayev model gives good results even if it doesn't take into account the reversion. Coran Ding and Leonov model has a lot of parameters but gives very good results. Then rheology is studied. For PU, kinetic and rheology are coupled. Hence the study is called rheokinetic study. We used Castro and Macosko model. Natural rubber is unreactive during the mold filling. Therefore kinetic is decoupled from rheology which is modelised by a Carreau Yasuda model. Wall slip is characterised by the Mooney method and modelised by using a Norton Hoff law (wall slip) and a Cross model (shearing). Thermomecanical sensibility is treated by using an energetic slip factor which depends on specific energy and matter temperature. Third part gives a confrontation between injection trials and calculated results obtained from a filling simulation software REM3D. PU injection used a transparent mold. Various techniques as visual techniques, titration or temperature measure, are used to characterize the process. The kinetic results are in agreement with the simulation. We use a spiral mold for natural rubber. Mold pressures are in agreement with simulation but some differences are noted for the nozzle pressure which is attributed to the elongational effects not taken into account in the viscous model.
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https://pastel.archives-ouvertes.fr/pastel-00001188
Contributor : Ecole Mines Paristech <>
Submitted on : Thursday, April 7, 2005 - 8:00:00 AM
Last modification on : Friday, April 3, 2020 - 1:59:27 AM
Document(s) archivé(s) le : Thursday, September 30, 2010 - 6:32:01 PM

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  • HAL Id : pastel-00001188, version 1

Citation

François Dimier. Injection de systèmes réactifs : détermination de lois cinétiques et rhéologiques et modélisation. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2003. Français. ⟨NNT : 2003ENMP1170⟩. ⟨pastel-00001188⟩

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