| Titre : |
Extensional rheology and processing of polymeric materials |
| Type de document : |
texte imprimé |
| Auteurs : |
H. Münstedt, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 594-618 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Déformations (mécanique)
Ecrouissage
Filature
Films plastiques
Matières plastiques -- Soufflage
Matières plastiques -- Thermoformage
Moussants
Rhéologie
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Many processing operations of polymeric materials are dominated by extensional flow. In this paper the question is addressed in which way rheological data obtained from elongational laboratory experiments can be used to describe the material behavior in various processes. Particularly discussed is the uniformity of geometrical features of items with respect to the strain hardening of the polymeric materials, because uniformity is important for many end-use properties. Convincing correlations with extensional rheology could not be established for thermoforming experiments on polypropylene. However, for blown and drawn films it was found that the uniformity of thickness improved, if strain hardening was introduced. The bubble stability could be related to the melt strength of the sample. Furthermore, the influences of elasticity and strain hardening on the neck-in during drawing of films were elucidated. Moreover, it was shown in which way extensional rheology can be used to assess foaming. |
| Note de contenu : |
- Main features of rheological properties in elongation
- Relevance of strain hardening for the uniformity of stretched samples
- Experimental methods
- Biaxial deformations
- Fiber spinning
- Thermoforming
- Film blowing
- Film casting
- Foaming |
| DOI : |
10.3139/217.3532 |
| En ligne : |
https://www.degruyter.com/document/doi/10.3139/217.3532/pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31391 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 5 (11/2018) . - p. 594-618
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Extensional rheology and processing of polymeric materials in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 5 (11/2018)
