UniSa - IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishCrystallization of isotactic polypropylene during step shear rate experiments is carried out in a plate-plate geometry by means of a Linkam shearing cell. The evolution of crystalline structures is observed during the tests at a fixed radial position. The samples are then analyzed by optical microscopy and the radial position at which a transition between the spherulitic and fibrillar morphology took place is measured. The analysis of the samples allows detecting the critical shear rate at which, after a given shearing time, the fibrillar morphology overcomes the spherulitic structure. With the aim of giving a quantitative description of the conditions for the formation of a fibrillar structure, two different models are applied: one based on molecular stretch, the other one relying on specific work.
| Titolo: | FIBRILLAR MORPHOLOGY IN SHEAR-INDUCED CRYSTALLIZATION OF POLYPROPYLENE | |
| Autori: | ||
| Data di pubblicazione: | 2014 | |
| Rivista: | ||
| Abstract: | Crystallization of isotactic polypropylene during step shear rate experiments is carried out in a plate-plate geometry by means of a Linkam shearing cell. The evolution of crystalline structures is observed during the tests at a fixed radial position. The samples are then analyzed by optical microscopy and the radial position at which a transition between the spherulitic and fibrillar morphology took place is measured. The analysis of the samples allows detecting the critical shear rate at which, after a given shearing time, the fibrillar morphology overcomes the spherulitic structure. With the aim of giving a quantitative description of the conditions for the formation of a fibrillar structure, two different models are applied: one based on molecular stretch, the other one relying on specific work. | |
| Handle: | http://hdl.handle.net/11386/4643012 | |
| Appare nelle tipologie: | 1.1.1 Articolo su rivista con DOI |
File in questo prodotto:
http://hdl.handle.net/11386/4643012
Copyright © 2021