| Téléchargement | - Voir la version finale : Spherulitic growth rates and coalescence phenomena in polypropylene/polyethylene-based ionomer blends (PDF, 2.4 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1021/ma00203a058 |
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| Auteur | Rechercher : Caldas, V.; Rechercher : Brown, G. Ronald; Rechercher : Willis, J. M.1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut des matériaux industriels du CNRC
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| Format | Texte, Article |
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| Résumé | The isothermal radial growth rates of spherulites of polypropylene in blends with an essentially
noncrystallizable ionomer have been determined by photomicroscopy. Blends containing 5 and 10
wt % ionomer, crystallized from the melt, have a grainy appearance due to ionomer entrapment and show
an increased nucleation density as compared to pure polypropylene. At large supercooling, these blends
also show depressed radial growth rates, which are attributed to a significant dissipation of energy by the
crystallizing front to affect the rejection of the ionomer domains. Upon repeated crystallization of a given
sample, an increase in the radial growth rate with melt time is observed initially giving rise to a maximum,
with general behavior that is dependent upon the blend composition and the crystallization temperature.
Beyond this maximum the spherulitic growth rate decreases upon further crystallization. The observed
effects on the spherulitic radial growth rates with respect to repeated crystallization are attributed to the
coalescence of the ionomer dispersed phase. This is consistent with a concomitant increase in the average
domain size. |
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| Date de publication | 1990-01-01 |
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| Maison d’édition | American Chemical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | CNRC 29721
NRC-IGM88AP-102-796-G |
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| Numéro NPARC | 23003996 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 4a4d2bca-abe7-4d15-ace1-79392b78484e |
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| Enregistrement créé | 2018-09-12 |
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| Enregistrement modifié | 2020-05-30 |
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