[article]
| 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 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 114-121
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A novel dilatometer for PVT measurements of polymers at high cooling – and shear rates in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)
