ISO 17744:2004
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Plastiques — Détermination du volume spécifique en fonction de la température et de la pression (diagramme pvT) — Méthode utilisant un appareil à piston
| Published By | Publication Date | Number of Pages |
| ISO | 2004-11 | 26 |
L'ISO 17744:2004 décrit les modes opératoires pour déterminer le volume spécifique des plastiques en fonction de la température et de la pression à l'état fondu et à l'état solide.
La norme spécifie l'utilisation d'un appareil à piston dans lequel l'échantillon d'essai, maintenu dans une cellule de mesure, est mis sous pression au moyen du piston. Des mesurages dans des conditions de pression constante ou de température constante peuvent être effectués. Dans le mode à pression constante, les vitesses maximales admissibles de chauffage et de refroidissement sont limitées à 5 °C/min.
En utilisant ces modes opératoires, il est possible d'obtenir:
- des diagrammes pvT qui représentent les relations entre la pression, le volume spécifique et la température d'un matériau donné;
- le coefficient de compressibilité et le coefficient de dilatation thermique volumétrique;
- la transition de premier ordre et la transition vitreuse en fonction de la température et de la pression.
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