| Titre : |
Coagent modified polypropylene prepared by reactive extrusion : a new look into the structure-property relations of injection molded parts |
| Type de document : |
texte imprimé |
| Auteurs : |
P. Tiwary, Auteur ; H. Gui, Auteur ; P. L. Ferreira, Auteur ; Marianna Kontopoulou, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 433-441 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Essais dynamiques
Extrusion réactive
Matières plastiques -- Moulage par injection
Matières plastiques -- Propriétés mécaniques
Matières plastiques -- Propriétés thermiques
Polypropylène
Rhéologie
Trimésate de triallyle
Triméthylolpropane
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Peroxide-mediated reactive extrusion of linear isotactic polypropylene (L-PP) was conducted in the presence of trimethylolpropane trimethacrylate (TMPTMA) and triallyl trimesate (TAM) coagents, using a twin screw extruder. The resulting coagent-modified polypropylenes (CM-PP) had higher viscosities and elasticities, as well as increased crystallization temperature compared to PP reacted only with peroxide (DCP-PP). Additionally, deviations from terminal flow, and strain hardening were observed in PP modified with TAM, signifying the presence of long chain branching (LCB). The CM-PP formulations retained the modulus and tensile strength of the parent L-PP, in spite of their lower molar mass and viscosities, whereas their elongation at break and the impact strength were better. This was attributed to the finer spherulitic structure of these materials, and to the disappearance of the skin-core layer in the injection molded specimens. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Reactive extrusion - Gel content analysis and gel permeation chromatography (GPC) - Injection molding - Mechanical testing - Optical microscopy - Differential scanning calorimetry (DSC)
- RESULTS AND DISCUSSION : Rheological characterization - Thermal properties and crystalline structure of the skin and core layers - Mechanical properties |
| DOI : |
10.3139/217.3209 |
| En ligne : |
https://drive.google.com/file/d/1tmHvxYaYmC_e0sd04Cwff5dRoA6Ky-Cb/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26805 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 4 (08/2016) . - p. 433-441
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