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Contrôle avancé de production de polyéthylène par spectroscopie Raman

Abstract : Since its discovery in 1933, polyethylene has known an important global industrial development. Today, Low Density Polyethylene (LDPE) suffers from high competition with many polymers. In order to preserve its market shares and meet the exact needs of the customers, more and more precise new generation laboratory controls must be considered in production plants to obtain a product with the best possible quality. This thesis work fits into this context. First, an exploratory study by Raman spectroscopy of the various grades produced by Total Carling, with the precise identification of LDPE peaks, the signature of the various reactives, as well as the thermal behavior of the polymer allows us a microstructural approach of the problem. The results are correlated by Differential Scanning Calorimetry (DSC) as well as by X-ray Diffraction (XRD). Thus the attribution of CH2 bending vibration bands is partially comprehensible from a mechanical point of view and differs from one grade to another, allowing their differentiation by Raman spectroscopy. Beyond the measurement of Melt Flow Index (MFI), Haze and additives concentration, the results of this study show that it is possible to determine and to quantify most of the production flaws (gels, cross-linking, and oxidation types). Consequences on the applicative properties are estimated and causes from within manufacturing process were also investigated
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Submitted on : Thursday, March 29, 2018 - 12:37:46 PM
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Richard Jumeau. Contrôle avancé de production de polyéthylène par spectroscopie Raman. Alimentation et Nutrition. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0108⟩. ⟨tel-01750095⟩



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