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“Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation

“Skin-core-skin” structure is a typical crystal morphology in injection products. Previous numerical works have rarely focused on crystal evolution; rather, they have mostly been based on the prediction of temperature distribution or crystallization kinetics. The aim of this work was to achieve the...

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Autor principal: Ruan, Chunlei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5951494/
https://www.ncbi.nlm.nih.gov/pubmed/29659516
http://dx.doi.org/10.3390/ma11040610
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author Ruan, Chunlei
author_facet Ruan, Chunlei
author_sort Ruan, Chunlei
collection PubMed
description “Skin-core-skin” structure is a typical crystal morphology in injection products. Previous numerical works have rarely focused on crystal evolution; rather, they have mostly been based on the prediction of temperature distribution or crystallization kinetics. The aim of this work was to achieve the “skin-core-skin” structure and investigate the role of external flow and temperature fields on crystal morphology. Therefore, the multiscale algorithm was extended to the simulation of polymer crystallization in a pipe flow. The multiscale algorithm contains two parts: a collocated finite volume method at the macroscopic level and a morphological Monte Carlo method at the microscopic level. The SIMPLE (semi-implicit method for pressure linked equations) algorithm was used to calculate the polymeric model at the macroscopic level, while the Monte Carlo method with stochastic birth-growth process of spherulites and shish-kebabs was used at the microscopic level. Results show that our algorithm is valid to predict “skin-core-skin” structure, and the initial melt temperature and the maximum velocity of melt at the inlet mainly affects the morphology of shish-kebabs.
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spelling pubmed-59514942018-05-15 “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation Ruan, Chunlei Materials (Basel) Article “Skin-core-skin” structure is a typical crystal morphology in injection products. Previous numerical works have rarely focused on crystal evolution; rather, they have mostly been based on the prediction of temperature distribution or crystallization kinetics. The aim of this work was to achieve the “skin-core-skin” structure and investigate the role of external flow and temperature fields on crystal morphology. Therefore, the multiscale algorithm was extended to the simulation of polymer crystallization in a pipe flow. The multiscale algorithm contains two parts: a collocated finite volume method at the macroscopic level and a morphological Monte Carlo method at the microscopic level. The SIMPLE (semi-implicit method for pressure linked equations) algorithm was used to calculate the polymeric model at the macroscopic level, while the Monte Carlo method with stochastic birth-growth process of spherulites and shish-kebabs was used at the microscopic level. Results show that our algorithm is valid to predict “skin-core-skin” structure, and the initial melt temperature and the maximum velocity of melt at the inlet mainly affects the morphology of shish-kebabs. MDPI 2018-04-16 /pmc/articles/PMC5951494/ /pubmed/29659516 http://dx.doi.org/10.3390/ma11040610 Text en © 2018 by the author. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ruan, Chunlei
“Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation
title “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation
title_full “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation
title_fullStr “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation
title_full_unstemmed “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation
title_short “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation
title_sort “skin-core-skin” structure of polymer crystallization investigated by multiscale simulation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5951494/
https://www.ncbi.nlm.nih.gov/pubmed/29659516
http://dx.doi.org/10.3390/ma11040610
work_keys_str_mv AT ruanchunlei skincoreskinstructureofpolymercrystallizationinvestigatedbymultiscalesimulation