Fibre in the diet of growing pigs

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Mechanical behavior of composite based polypropylene: Recycling and strain rate effects

Recycling effects on the dynamic response of composite based polypropylene is studied in this paper. Materials used here are filled and unfilled impact modified polypropylene. Nodules of EPDM represent the elastomeric phase for the filled composite based polypropylene. Fillers are particles of talc. For the unfilled polypropylene, the elastomeric phase is nodules of EPR. Different tensile tests, until rupture, were performed from quasi static to high strain rates. Virgin specimens were recycled in order to study the degradation due to the effect of recycling under dynamic loading. Thus microstructural effects due to dynamic loading and recycling were observed by SEM

Micromechanical approach of the dynamic behavior of a high impact PP and a PP compound: Recycling and pollution effects

9th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading, Royal Mil Acad, Brussels, BELGIUM, SEP 07-11, 2009International audienceIn this work, pollution and recycling effects are studied on two polypropylene-based materials. These materials are used in car bumpers and are submitted to impact and crash. In order to re-use them as structural part of cars, the pollution, the recycling and combined effects have been studied [1, 2]. Model pollutants chosen in this study were ethylene glycol and engine oil. They were added during the extrusion process to simulate the degradation due to the pollutants. The recycling process was simulated by performing several extrusion runs with the same material in order to have a better comprehension of the multi recycling effects. The pollutants, the recycling and the effects of both were identified not only on the elastic properties but also on viscoelastic and viscoplastic properties at various strain rates. Dynamic mechanical analysis, quasistatic tensile tests, and dynamic compression tests on Split Hopkinson pressure bars have been performed. The analysis of the different obtained results led to a better understanding of the impact of pollution and reprocessing. Pollutants slightly affect the rheological properties while mechanical properties are more influenced. Concerning the recycling, six reprocessing have been necessary to observe a significant modification of the theological and mechanical properties. But surprisingly, the presence of both pollutants not only decreases the recycling effects but also doesn't affect the micromechanical morphology leading to an improvement of the behavior of recycled materials

Micromechanical approach of the dynamic behavior of a high impact PP and a PP compound: Recycling and pollution effects

In this work, pollution and recycling effects are studied on two polypropylene-based materials. These materials are used in car bumpers and are submitted to impact and crash. In order to re-use them as structural part of cars, the pollution, the recycling and combined effects have been studied [Directive 2003/53/CE, du Parlement Européen et du Conseil, Journal official de l'Union Européenne, 2003; Dasari A. and Misra R. D. K., Mat. Sci. and Engin. 358 (2003), 356-371.]. Model pollutants chosen in this study were ethylene glycol and engine oil. They were added during the extrusion process to simulate the degradation due to the pollutants. The recycling process was simulated by performing several extrusion runs with the same material in order to have a better comprehension of the multi recycling effects. The pollutants, the recycling and the effects of both were identified not only on the elastic properties but also on viscoelastic and viscoplastic properties at various strain rates. Dynamic mechanical analysis, quasistatic tensile tests, and dynamic compression tests on Split Hopkinson pressure bars have been performed. The analysis of the different obtained results led to a better understanding of the impact of pollution and reprocessing. Pollutants slightly affect the rheological properties while mechanical properties are more influenced. Concerning the recycling, six reprocessing have been necessary to observe a significant modification of the rheological and mechanical properties. But surprisingly, the presence of both pollutants not only decreases the recycling effects but also doesn't affect the micromechanical morphology leading to an improvement of the behavior of recycled materials

An optimized isotopic labelling strategy of isoleucine-γ2 methyl groups for solution NMR studies of high molecular weight proteins

International audienceAn efficient synthetic route is proposed to produce 2-hydroxy-2-ethyl-3-oxobutanoate for the specific labelling of Ile methyl-γ2groups in proteins. The 2H, 13C-pattern of the biosynthetic precursor has been designed to optimize magnetization transfer, in large proteins, between these important structural probes and their corresponding backbone nuclei

Influence de polluants sur les propriétés mécaniques de PP-chocs issus du recyclage des véhicules hors d'usage

10-12 octobreInternational audienc