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Materials 2018, 11(4), 610;

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

School of Mathematics and Statistics, Henan University of Science and Technology, Luoyang 471023, China
Received: 16 March 2018 / Revised: 6 April 2018 / Accepted: 13 April 2018 / Published: 16 April 2018
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“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. View Full-Text
Keywords: “skin-core-skin” structure; flow-induced crystallization; multiscale simulation; crystal morphology “skin-core-skin” structure; flow-induced crystallization; multiscale simulation; crystal morphology

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ruan, C. “Skin-Core-Skin” Structure of Polymer Crystallization Investigated by Multiscale Simulation. Materials 2018, 11, 610.

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