Rheological modeling of flow-induced crystallization in polymer melts and limitations on classification of experiments

R. J.A. Steenbakkers, G. W.M. Peters, H. E.H. Meijer

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

7 Citaten (Scopus)
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Samenvatting

A model has been developed, which provides a coupling between the kinetics of flow-induced crystallization and the relaxation behavior of the high molecular weight chains in a polymer melt. Stretch of the backbone tubes of these chains is found to be the key factor in the formation of nucleation precursors. Orientation is not sufficient. This is demonstrated by combining simulations and experiments with different materials, under varying flow conditions and at different temperatures. Saturation of the number density of flow-induced precursors and resulting nuclei, which is an essential element of the model, is also observed in experiments. The saturated number density is shown as a function of characteristic Weissenberg numbers, based on the reptation time and on the Rouse time of the high molecular weight chains. In some experiments, a large effect of flow is observed while the Weissenberg number based on the Rouse time is smaller than unity. This apparent disagreement with the model is discussed, showing that classification of flow-induced crystallization experiments based on Weissenberg numbers is difficult, if not impossible. When longitudinal growth of precursors is included, the saturation part of the model should be reformulated, depending on whether only chains of high molecular weight or chains of all molecular weights are involved in the growth process. Based on rheological measurements on crystallizing melts, the latter appears to be the case.

Originele taal-2Engels
TitelThe XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting
Plaats van productieNew York
UitgeverijAmerican Institute of Physics
Pagina's493-495
Aantal pagina's3
ISBN van geprinte versie9780735405493
DOI's
StatusGepubliceerd - 11 sep 2008
Evenement15th International Congress on Rheology - Monterey Conference Center, Monterey, Verenigde Staten van Amerika
Duur: 3 aug 20088 aug 2008
Congresnummer: 15
http://www.rheology.org/ICR2008/

Publicatie series

NaamAIP Conference Proceedings
Nummer1
Volume1027
ISSN van geprinte versie0094-243x
ISSN van elektronische versie1551-7616

Congres

Congres15th International Congress on Rheology
Verkorte titelICR 2008
Land/RegioVerenigde Staten van Amerika
StadMonterey
Periode3/08/088/08/08
Internet adres

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