Deformation and failure kinetics of iPP polymorphs

Harm J.M. Caelers, Emanuele Parodi, Dario Cavallo, Gerrit W.M. Peters, Leon E. Govaert

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Abstract

In this study, the mechanical performance of the different polymorphs of isotactic polypropylene, typically present in iPP crystallized under industrial processing conditions, is assessed. Different preparation strategies were used to obtain samples consisting of almost solely α, β, or γ crystals. X-Ray measurements were used to validate that the desired phase was obtained. The intrinsic true stress - true strain response of all individual phases was measured in uniaxial compression at several strain rates (deformation kinetics). Moreover, measurements were performed over a wide temperature range, covering the window in between the glass transition and the melting temperature. The relation between obtained yield stress and the strain rate is described with a modification of the Ree-Eyring model. Differences and similarities in the deformation kinetics of the different phases are presented and discussed. Furthermore, the presence of three deformation processes, acting in parallel, is revealed. The Ree-Eyring equation enables lifetime prediction for given thermal and mechanical conditions. These predictions were experimentally validated using constant load tests in uniaxial compression.

Original languageEnglish
Pages (from-to)729-747
Number of pages19
JournalJournal of polymer science. Part B: Polymer physics
Volume55
Issue number9
DOIs
Publication statusPublished - 1 May 2017

Fingerprint

Polymorphism
Kinetics
strain rate
Strain rate
kinetics
load tests
Polypropylenes
predictions
polypropylene
Yield stress
Melting point
Glass transition
coverings
melting
X rays
life (durability)
preparation
Crystals
temperature
glass

Keywords

  • Failure kinetics
  • Intrinsic properties
  • iPP-polymorphism
  • Lifetime predictions
  • Mechanical behavior
  • Yield kinetics
  • α-, β- and γ-iPP

Cite this

Caelers, Harm J.M. ; Parodi, Emanuele ; Cavallo, Dario ; Peters, Gerrit W.M. ; Govaert, Leon E. / Deformation and failure kinetics of iPP polymorphs. In: Journal of polymer science. Part B: Polymer physics. 2017 ; Vol. 55, No. 9. pp. 729-747.
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Deformation and failure kinetics of iPP polymorphs. / Caelers, Harm J.M.; Parodi, Emanuele; Cavallo, Dario; Peters, Gerrit W.M.; Govaert, Leon E.

In: Journal of polymer science. Part B: Polymer physics, Vol. 55, No. 9, 01.05.2017, p. 729-747.

Research output: Contribution to journalArticleAcademicpeer-review

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