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Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling

This paper deals with the viscoelastic behavior during crystallization and melting of semicrystalline polymers, with the aim of later modeling the residual stresses after processing in cases where crystallization occurs in quasi-static conditions (in additive manufacturing for example). Despite an a...

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Autores principales: Billon, Noëlle, Castellani, Romain, Bouvard, Jean-Luc, Rival, Guilhem
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10534810/
https://www.ncbi.nlm.nih.gov/pubmed/37765698
http://dx.doi.org/10.3390/polym15183846
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author Billon, Noëlle
Castellani, Romain
Bouvard, Jean-Luc
Rival, Guilhem
author_facet Billon, Noëlle
Castellani, Romain
Bouvard, Jean-Luc
Rival, Guilhem
author_sort Billon, Noëlle
collection PubMed
description This paper deals with the viscoelastic behavior during crystallization and melting of semicrystalline polymers, with the aim of later modeling the residual stresses after processing in cases where crystallization occurs in quasi-static conditions (in additive manufacturing for example). Despite an abundant literature on polymer crystallization, the current state of scientific knowledge does not yet allow ab initio modeling. Therefore, an alternative and pragmatic way has been explored to propose a first approximation of the impact of crystallization and melting on the storage and loss moduli during crystallization–melting–crystallization cycles. An experimental approach, combining DSC, optical microscopy and oscillatory shear rheology, was used to define macroscopic parameters related to the microstructure. These parameters have been integrated into a phenomenological model. Isothermal measurements were used to describe the general framework, and crystallization at a constant cooling rate was used to evaluate the feasibility of a general approach. It can be concluded that relying solely on the crystalline fraction is inadequate to model the rheology. Instead, accounting for the microstructure at the spherulitic level could be more useful. Additionally, the results obtained from the experiments help to enhance our understanding of the correlations between crystallization kinetics and its mechanical effects.
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spelling pubmed-105348102023-09-29 Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling Billon, Noëlle Castellani, Romain Bouvard, Jean-Luc Rival, Guilhem Polymers (Basel) Article This paper deals with the viscoelastic behavior during crystallization and melting of semicrystalline polymers, with the aim of later modeling the residual stresses after processing in cases where crystallization occurs in quasi-static conditions (in additive manufacturing for example). Despite an abundant literature on polymer crystallization, the current state of scientific knowledge does not yet allow ab initio modeling. Therefore, an alternative and pragmatic way has been explored to propose a first approximation of the impact of crystallization and melting on the storage and loss moduli during crystallization–melting–crystallization cycles. An experimental approach, combining DSC, optical microscopy and oscillatory shear rheology, was used to define macroscopic parameters related to the microstructure. These parameters have been integrated into a phenomenological model. Isothermal measurements were used to describe the general framework, and crystallization at a constant cooling rate was used to evaluate the feasibility of a general approach. It can be concluded that relying solely on the crystalline fraction is inadequate to model the rheology. Instead, accounting for the microstructure at the spherulitic level could be more useful. Additionally, the results obtained from the experiments help to enhance our understanding of the correlations between crystallization kinetics and its mechanical effects. MDPI 2023-09-21 /pmc/articles/PMC10534810/ /pubmed/37765698 http://dx.doi.org/10.3390/polym15183846 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Billon, Noëlle
Castellani, Romain
Bouvard, Jean-Luc
Rival, Guilhem
Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling
title Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling
title_full Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling
title_fullStr Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling
title_full_unstemmed Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling
title_short Viscoelastic Properties of Polypropylene during Crystallization and Melting: Experimental and Phenomenological Modeling
title_sort viscoelastic properties of polypropylene during crystallization and melting: experimental and phenomenological modeling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10534810/
https://www.ncbi.nlm.nih.gov/pubmed/37765698
http://dx.doi.org/10.3390/polym15183846
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