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A method for the determination and correction of the effect of thermal degradation on the viscoelastic properties of degradable polymers

Choong, Gabriel Y. H.; De Focatiis, Davide S.A.

A method for the determination and correction of the effect of thermal degradation on the viscoelastic properties of degradable polymers Thumbnail


Authors

Gabriel Y. H. Choong



Abstract

Small amplitude oscillatory shear is carried out during isothermal degradation of poly(lactic acid) (PLA) in order to determine the evolution of the characteristic relaxation time with degradation time and temperature. After reducing the relaxation time data to a single mastercurve, a 4-parameter function is fitted to the data to allow prediction of the change in relaxation time following an arbitrary thermal history. The method enables separation of the effects of temperature and of degradation on the relaxation time, both of which lead to a horizontal shift of dynamic data along the frequency axis, and hence enable a correction for thermal degradation during rheometry to be carried out. To validate the method, two isothermal frequency sweeps were measured with different temperature histories, producing different mastercurves due to dissimilar in-test thermal degradation. After correcting for thermal degradation using the function and the thermal histories, the two frequency sweeps reduce to the same viscoelastic mastercurve in the undegraded pre-test state.

Citation

Choong, G. Y. H., & De Focatiis, D. S. (2016). A method for the determination and correction of the effect of thermal degradation on the viscoelastic properties of degradable polymers. Polymer Degradation and Stability, 130, 182-188. https://doi.org/10.1016/j.polymdegradstab.2016.06.018

Journal Article Type Article
Acceptance Date Jun 15, 2016
Online Publication Date Jun 16, 2016
Publication Date Aug 1, 2016
Deposit Date Jul 27, 2016
Publicly Available Date Jul 27, 2016
Journal Polymer Degradation and Stability
Print ISSN 0141-3910
Electronic ISSN 1873-2321
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 130
Pages 182-188
DOI https://doi.org/10.1016/j.polymdegradstab.2016.06.018
Keywords Biodegradable polymers; thermal degradation; melt rheology; linear viscoelasticity
Public URL https://nottingham-repository.worktribe.com/output/797218
Publisher URL https://doi.org/10.1016/j.polymdegradstab.2016.06.018
Additional Information This article is maintained by: Elsevier; Article Title: A method for the determination and correction of the effect of thermal degradation on the viscoelastic properties of degradable polymers; Journal Title: Polymer Degradation and Stability; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.polymdegradstab.2016.06.018; Content Type: article; Copyright: © 2016 The Authors. Published by Elsevier Ltd.

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