| Titre : |
Crystallization studies of LLDPE during tubular blown film processing |
| Type de document : |
texte imprimé |
| Auteurs : |
M. D. Bullwinkel, Auteur ; G. A. Campbell, Auteur ; D. H. Rasmussen, Auteur ; J. Krexa, Auteur ; C. J. Brancewitz, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 39-47 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
668.9 Polymères |
| Résumé : |
The final physical properties of semi-crystalline blown films are highly dependent on the crystalline morphology and orientation of polymer chains within the film. Simultaneous on-line SALS (Small Angle Light Scattering) and IR (Infrared) temperature measurements were successfully used to study crystallization during tubular blown film extrusion of LLDPE. SALS patterns were recorded at various vertical positions along the bubble. For LLDPE an undeformed spherelulitic structure is formed if the stress level during processing is not too high. The change in average scattered intensity with axial position can be described using multiple step Avrami kinetic processes in parallel. the first step accounts for crystal growth and corresponds to the well-known temperature plateau. The later processes start with the impingement of the growing spherulites and may reflect secondary crystallization and orientation processes. Because the magnitude of the average intensity is responsive to changes in process conditions, the on-line SALS system is potentially a useful tool for monitoring process-property interactions. |
| Note de contenu : |
- Experiments
- Process data analysis
- SALS image analysis
- Temperature profile
- SALS-analysis
- Effect of process conditions |
| DOI : |
10.3139/217.1624 |
| En ligne : |
https://drive.google.com/file/d/1Y_XBRZpYXsYj7wpyU1625EJCvqWmDhqw/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15883 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 1 (03/2001) . - p. 39-47
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