Analysis and optimization of kenics static mixers / O. S. Galaktionov in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 138-150 Titre : Analysis and optimization of kenics static mixers Type de document : texte imprimé Auteurs : O. S. Galaktionov, Auteur ; P. D. Anderson, Auteur ; G. W. M. Peters, Auteur ; Han E. H. Meijer, Auteur Année de publication : 2003 Article en page(s) : p. 138-150 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The mapping approach is applied to study the distributive mixing in the, widely industrially used, Kenics static mixer. The flexibility of the mapping method makes it possible to study and compare thousands of different mixer layouts and perform optimization with respect to macroscopic homogenization efficiency and interface generation. In the paper two different designs of the mixer are investigated. The conventional mixer with sequentially different twisted blades and adesign where the twist direction is maintained constant. In both cases the blade twist angle is varied. Recommendations are given in the choice of the design of the mixer dependent on the desired structure of mixing. DOI : 10.3139/217.1732 En ligne : https://drive.google.com/file/d/1O-aSON1qHkt83ACQRHUrUeZrekV2QbYN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3304 [article]

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Crystallinity and linear rheological properties of polymers / G. Lamberti in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 3 (07/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 3 (07/2007) . - p. 303-310 Titre : Crystallinity and linear rheological properties of polymers Type de document : texte imprimé Auteurs : G. Lamberti, Auteur ; G. Titomanlio, Auteur ; G. W. M. Peters, Auteur Année de publication : 2007 Article en page(s) : p. 303-310 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The crystallization of a polymer melt, taking place during transformation processes, has a great impact on the process itself, mainly because it causes a large increase in the viscosity (hardening). Knowledge of the hardening kinetics is important for modeling and controlling the transformation processes. In this work, first an overview is given of the experimental and modeling work on the hardening of crystallizing polymers. Next, we present isothermal crystallization experiments using differential scanning calorimetry (DSC) and rotational rheometry to measure the dynamic viscosity. The evolution of the relative crystallinity and normalized complex viscosity are correlated by a novel technique which allows simultaneous analysis of several runs, even if they are not carried out at same temperatures; the main requirement with the traditional technique. The technique, described in detail in this paper, provides an experimental relationship between the crystallinity and the hardening, i.e. the increase in the viscosity. Moreover, by measuring the dynamic viscosity at different frequencies, surprisingly, a master curve is obtained which combines the effects of shear rate, temperature and the level of crystallinity. DOI : 10.3139/217.2006 En ligne : https://drive.google.com/file/d/1k6Wv4JH11chxsFT9c65tRgm1ZvmdmpNz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2708 [article]

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A design to study flow induced crystallization in a multipass rheometer / J.-W. Housmans in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 185-198 Titre : A design to study flow induced crystallization in a multipass rheometer Type de document : texte imprimé Auteurs : J.-W. Housmans, Auteur ; Han E. H. Meijer, Auteur ; G. W. M. Peters, Auteur ; D. Santoro, Auteur ; L. Balzano, Auteur Année de publication : 2009 Article en page(s) : p. 185-198 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The design and performance of a flow geometry for the multipass rheometer (MPR) is described, creating an experimental setup to study in-situ and ex-situ structure and morphology development with a proper control over the processing conditions and shear history. The slit used is equipped with diamond windows, to combine flow with different experimental techniques, such as optical microscopy (OM), birefringence and X-ray scattering. In this paper we present preliminary results, obtained on isotactic polypropylene, that demonstrate the possibilities of this device for more extended future research. The focus is on the in-situ birefringence measurements of crystallization and the relation with the final morphology. DOI : 10.3139/217.2230 En ligne : https://drive.google.com/file/d/1W07Px1_utLzsTvJr5XLJCl-Pl2KNETMs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5250 [article]

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A dilatometer to measure the influence of cooling rate and melt shearing on specific volume / M. H. E. van der Beek in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 2 (06/2005) . - p. 111-120 Titre : A dilatometer to measure the influence of cooling rate and melt shearing on specific volume Type de document : texte imprimé Auteurs : M. H. E. van der Beek, Auteur ; Han E. H. Meijer, Auteur ; G. W. M. Peters, Auteur Année de publication : 2005 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : We developed a dilatometer to investigate the specific volume of polymers as a function of pressure (to 100MPa), temperature (to 260°C), cooling rate (to 100°C/s), and shear rate (to 801/s). The dilatometer is based on the principle of confined compression and comprises of a pressure cell used in combination with a tensile testing machine with rotation capability. The design of the pressure cell is a mixture of a traditional ‘pistondie type’ dilatometer and a Couette rheometer, i.e. piston and die make up an annular shaped sample spacing. Typical dimensions of annular samples are: inner radius ri = 10.5mm, outer radius ro = 11.0mm, height h = 2.5mm, and a typical mass of about 60 to 70mg. Silicon grease is used to reduce loss of hydrostatic pressure in the sample due to friction occurring between the solidifying sample and the dilatometer wall. Specific volume measurements at low cooling rate using an isotactic polypropylene (i-PP) are compared with measurements performed using a commercial bellows type dilatometer, showing relative differences in the range of 0.1 to 0.4%. Finally, results for an isotactic polypropylene are presented showing a profound influence of cooling rate and melt shearing on the evolution of specific volume. DOI : 10.3139/217.1872 En ligne : https://drive.google.com/file/d/1Bo9V5oP1mUrdWVg2yWcFXJK00M-H5eHK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3070 [article]

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Experimental/numerical analysis of chaotic advection in a three-dimensional cavity flow / P. D. Anderson in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 4 (09/2006) . - p. 412-420 Titre : Experimental/numerical analysis of chaotic advection in a three-dimensional cavity flow Type de document : texte imprimé Auteurs : P. D. Anderson, Auteur ; Han E. H. Meijer, Auteur ; G. W. M. Peters, Auteur ; D. Ternet, Auteur Année de publication : 2006 Article en page(s) : p. 412-420 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Advection of material volumes in a three-dimensional cavity flow is analyzed by using an experimental setup and a collection of computational tools. The experimental setup for the lid-driven cavity flow makes it possible to study the advection of drops for a wide range of flow parameters. The location of unmixed regions for a specific mixing protocol is predicted by means of the mapping method, which are then used to determine the initial location of the dyed drops in the experiments. Finally, an adaptive front tracking method is used to computationally follow the drops during flow in a precise way. In most cases, a qualitative comparison between the experiments and the simulations is found. In addition, the mapping method proves to be well suited to quickly predict unmixed regions in mixers. DOI : 10.3139/217.0125 En ligne : https://drive.google.com/file/d/156zyM9SRxhbxSQb854F1d2oVuhhJSqT-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2819 [article]

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A novel dilatometer for PVT measurements of polymers at high cooling – and shear rates / R. Forstner in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

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Processing-induced properties in glassy polymers / L. E. Govaert in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)  

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Stress induced crystallization in elongational flow / F. H. M. Swartjes in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 1 (03/2003)  

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The mapping method for mixing optimization / P. G. M. Kruijt in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

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The mapping method for mixing optimization / P. G. M. Kruijt in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

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The matching of experimental polymer processing flows to viscoelastic vumerical simulation / Jean-François Agassant in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)  

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