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Published in: Colloid and Polymer Science 12/2011

01-08-2011 | Original Contribution

Effect of melt viscosity on the crystallization kinetics of pre-sheared metallocene polyethylene melts

Authors: Joanna Krakowiak, José A. Martins, Weidong Zhang

Published in: Colloid and Polymer Science | Issue 12/2011

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Abstract

This work aims to verify the impossibility mentioned in the literature of saturating the crystallization kinetics of pre-sheared metallocene polyethylene melts. Similarly to results reported for other materials, and contrary to other published works, an acceleration of crystallization kinetics with the increase of shear strain and its saturation at large strain values was found. Similar strain values, with the same temperature variation, were evaluated with independent experiments using different devices, which allowed us to identify the steady state as the melt state responsible for the saturation of crystallization kinetics. Since this is a partially disentangled melt state, with viscosity lower than that of fully entangled (relaxed) melts, we assign the acceleration of crystallization kinetics by application of shear, and its saturation, mainly to the facilitated diffusion of chain segments to the lamellae growth front. This conclusion is supported additionally with the experimental results of other authors.

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Appendix
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Metadata
Title
Effect of melt viscosity on the crystallization kinetics of pre-sheared metallocene polyethylene melts
Authors
Joanna Krakowiak
José A. Martins
Weidong Zhang
Publication date
01-08-2011
Publisher
Springer-Verlag
Published in
Colloid and Polymer Science / Issue 12/2011
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-011-2451-7

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