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Rheologica Acta

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01-02-2012 | Original Contribution

Viscoelastic behaviour and flow instabilities of biodegradable poly (ε-caprolactone) polyesters

Authors: Nazbanoo Noroozi, Jaclyn A. Thomson, Nader Noroozi, Laurel L. Schafer, Savvas G. Hatzikiriakos

Published in: Rheologica Acta | Issue 2/2012

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Abstract

The viscoelastic behaviour of a number of commercial and newly synthesized linear biodegradable polyesters—poly (ε-caprolactone) (PCLs) with different molecular characteristics was investigated using both rotational and extensional rheometry. The variation of the zero-shear viscosity and relaxation spectrum with molecular weight was studied in detail. The damping function of these PCLs was also determined in order to model their viscoelastic behaviour. The classic Wagner constitutive equation was found to represent the rheology of all PCL polymers quite well. Finally, the PCL processing instabilities were studied by capillary extrusion using a number of capillary dies having various diameter and length-to-diameter ratios. Sharkskin and gross melt fracture was observed at different shear rates depending on the molecular characteristics of the resins and the geometrical details of the capillary dies.

previous article Elongational viscosity of LDPE with various structures: employing a new evolution equation in MSF theory

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Title: Viscoelastic behaviour and flow instabilities of biodegradable poly (ε-caprolactone) polyesters
Authors: Nazbanoo Noroozi
Jaclyn A. Thomson
Nader Noroozi
Laurel L. Schafer
Savvas G. Hatzikiriakos
Publication date: 01-02-2012
Publisher: Springer-Verlag
Published in: Rheologica Acta / Issue 2/2012
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-011-0586-6

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