Gabriel Y. H. Choong
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.
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. |
Contract Date | Jul 27, 2016 |
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