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Modeling non-linear rheology of PLLA : comparison of Giesekus and Rolie-Poly constitutive models

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Stępień, Maja, Choon, Gabriel, De Focatiis, Davide and Figiel, Lukasz (2020) Modeling non-linear rheology of PLLA : comparison of Giesekus and Rolie-Poly constitutive models. International Journal of Biobased Plastics . doi:10.1080/24759651.2020.1808367

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Official URL: https://doi.org/10.1080/24759651.2020.1808367

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Abstract

Rheological models for biobased plastics can assist in predicting optimum processing parameters in industrial forming processes for biobased plastics and their composites such as film blowing, or injection stretch-blow molding in the packaging industry. Mathematical descriptions of polymer behavior during these forming processes are challenging, as they involve highly nonlinear, time-, temperature-, and strain-dependent physical deformation processes in the material, and have not been sufficiently tested against experimental data in those regimes. Therefore, the predictive capability of two polymer models, a classical Giesekus and a physically-based Rolie-Poly, is compared here for extensional and shear rheology data obtained on a poly(L-lactide) (PLLA) across a wide range of strain rates of relevance to those forming processes. Generally, elongational and shear melt flow behavior of PLLA was predicted to a satisfactory degree by both models across a wide range of strain rates (for strain rates 0.05–10.0 s−1), within the strain window up to 1.0. Both models show a better predictive capability for smaller strain rates, and no significant differences between their predictions were found. Hence, as the Giesekus model generally needs a smaller number of parameters, this class of models is more attractive when considering their use in computationally demanding forming simulations of biobased thermoplastics.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Biopolymers, Biodegradable plastics, Plastics -- Biodegradation, Polylactic acid , Rheology , Polymers -- Rheology
Journal or Publication Title: International Journal of Biobased Plastics
Publisher: Taylor and Francis
ISSN: 2475-9651
Official Date: 1 September 2020
Dates:
DateEvent
1 September 2020Available
5 August 2020Accepted
Date of first compliant deposit: 3 September 2020
DOI: 10.1080/24759651.2020.1808367
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
DEC-2011/01/B/ST8/06492Narodowym Centrum NaukiUNSPECIFIED
RISE action 691238H2020 Marie Skłodowska-Curie Actionshttp://dx.doi.org/10.13039/100010665
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