Heat transfer through metal walls of finite thickness / M. Janeschitz-Kriegl in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 1 (03/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 1 (03/2006) . - p. 41-48 Titre : Heat transfer through metal walls of finite thickness : The art of correctly quenching a polymer melt at a metal wall Type de document : texte imprimé Auteurs : M. Janeschitz-Kriegl, Auteur ; R. Forstner, Auteur ; G. Eder, Auteur ; Hermann Janeschitz-Kriegl, Auteur Année de publication : 2006 Article en page(s) : p. 41-48 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A quenching technique is scrutinized, where the surface of a polymer melt is brought into contact with a metal wall of a well defined lower temperature at time zero. Usually, this wall temperature has approximately been kept constant with the aid of a streaming heat transfer fluid. It turns out, however, that an exactly invariable wall temperature or a finite Biot number (finite heat transfer coefficient to the cooling fluid) are inadequate assumptions. However, an exact interface temperature is to berealized, if the crystallization kinetics of the polymer is to be investigated painstakingly at this interface. The reason for this requirement lies in the fact that the said kinetics is extremely sensitive to small temperature changes. The present contribution shows that a water cooled metal wall of small thickness is inadequate for the purpose. A rather thick metal wall, which is preheated to the required temperature and thermally insulated at the outside, is clearly preferable. Copper is better than steel. DOI : 10.3139/217.0091 En ligne : https://drive.google.com/file/d/1Tgs2Q2_BAAy8SlgCn2J5SAddVFbB7kru/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2928 [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)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 114-121 Titre : A novel dilatometer for PVT measurements of polymers at high cooling – and shear rates Type de document : texte imprimé Auteurs : R. Forstner, Auteur ; G. W. M. Peters, Auteur ; Han E. H. Meijer Année de publication : 2009 Article en page(s) : p. 114-121 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A novel dilatometer to investigate the specific volume of polymers as a function of the combined effect of pressure (100 MPa), temperature (300°C), cooling rate (100°C/s) and shear rate (200 l/s) was developed. The dilatometer consists of a pressure cell, which in design is a combination of a traditional "piston-die type" dilatometer and a Couette rheometer, embedded in a custom made frame, which allowed for scaling down to a "table-sized" machine that requires only standard laboratory supplies, like pressurized air and tap water, for operation and cooling. We implemented software for fully automated control of procedures to operate non-isothermal experiments with shear steps applied at predefined temperatures. The sample rings (m ≈ 65 mg) used in the dilatometer are made with a micro injection moulding machine. Experiments with two commercial isotactic Polypropylene (iPP) grades at low cooling rates, performed by two independent groups, were compared with measurements from a commercial confined fluids dilatometer showing small relative differences in the range of 0.03 to 0.3 %. As an example, additional results of an isotactic polypropylene were chosen to show the profound influence of cooling rate and melt shearing on the evolution of specific volume. DOI : 10.3139/217.2154 En ligne : https://drive.google.com/file/d/1jkyHGKRY5UfrFk7BfIt4JHtS2xRYi6j8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5223 [article]

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