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

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

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.

Original languageEnglish
Title of host publicationThe XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting
Place of PublicationNew York
PublisherAmerican Institute of Physics
Pages493-495
Number of pages3
ISBN (Print)9780735405493
DOIs
Publication statusPublished - 11 Sep 2008
Event15th International Congress on Rheology - Monterey Conference Center, Monterey, United States
Duration: 3 Aug 20088 Aug 2008
Conference number: 15
http://www.rheology.org/ICR2008/

Publication series

NameAIP Conference Proceedings
Number1
Volume1027
ISSN (Print)0094-243x
ISSN (Electronic)1551-7616

Conference

Conference15th International Congress on Rheology
Abbreviated titleICR 2008
CountryUnited States
CityMonterey
Period3/08/088/08/08
Internet address

Keywords

  • Constitutive modeling
  • Flow-induced crystallization
  • Polymer melt rheology

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