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Formation mechanism of hierarchically crystalline structures under coupled external fields in multi-melt multi-injection molding: Simulation and experiment.

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Title: Formation mechanism of hierarchically crystalline structures under coupled external fields in multi-melt multi-injection molding: Simulation and experiment.
Authors: Chen, Li-Bo1 (AUTHOR), Huang, Yan-Hao1 (AUTHOR), Liu, Lei1 (AUTHOR), Zhao, Xin1 (AUTHOR), Liu, Zheng-Ying1 (AUTHOR), Yang, Wei1 (AUTHOR), Yang, Ming-Bo1 (AUTHOR) yangmb@scu.edu.cn
Source: Composites: Part B, Engineering. May2020, Vol. 188, pN.PAG-N.PAG. 1p.
Subjects: Crystal structure, High density polyethylene, Finite volume method, Crystal morphology, Crystal lattices, Interface structures, Phononic crystals
Abstract: In order to clarify the formation mechanism of hierarchically crystalline structures in multi-melt multi-injection molding (M3IM), the structures around the interface were examined, as well as the shear fields and temperature fields were simulated by 3D finite volume method (3D-FVM) and volume of fluid (VOF) method. It is found that theoretically isotactic polypropylene (iPP) tends to form highly oriented superstructures when subjected a critical shear rate of about 1200 s−1 and a cooling rate of 12.5 °C⋅s−1 in the second penetration process of M3IM, while high density polyethylene (HDPE) shows some otherwise in critical conditions to form oriented morphologies in the penetrated layer, i.e., cooling rate of 10 °C⋅s−1 is inadequate for HDPE shish-kebab structures fabrication even though the shear rate surpasses 1200 s−1. This work constructs a bridge between coupled external fields analyzing which involves a multiphase interface and complicate crystal morphologies prediction under multiple melt flow in a facile way. Image 1 • Coupled external fields around the interface were simulated. • Hierarchically crystalline structures around the interface were examined. • Relationship between external fields and structural hierarchy were established. • Critical forming conditions of oriented superstructures were established. • Great significance for predicting possible crystal morphologies. [ABSTRACT FROM AUTHOR]
Copyright of Composites: Part B, Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 142207454
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Formation mechanism of hierarchically crystalline structures under coupled external fields in multi-melt multi-injection molding: Simulation and experiment.
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Li-Bo%22">Chen, Li-Bo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Yan-Hao%22">Huang, Yan-Hao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Lei%22">Liu, Lei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Xin%22">Zhao, Xin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Zheng-Ying%22">Liu, Zheng-Ying</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Wei%22">Yang, Wei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Ming-Bo%22">Yang, Ming-Bo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yangmb@scu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Composites%3A+Part+B%2C+Engineering%22">Composites: Part B, Engineering</searchLink>. May2020, Vol. 188, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Crystal+structure%22">Crystal structure</searchLink><br /><searchLink fieldCode="DE" term="%22High+density+polyethylene%22">High density polyethylene</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+volume+method%22">Finite volume method</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+morphology%22">Crystal morphology</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+lattices%22">Crystal lattices</searchLink><br /><searchLink fieldCode="DE" term="%22Interface+structures%22">Interface structures</searchLink><br /><searchLink fieldCode="DE" term="%22Phononic+crystals%22">Phononic crystals</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In order to clarify the formation mechanism of hierarchically crystalline structures in multi-melt multi-injection molding (M3IM), the structures around the interface were examined, as well as the shear fields and temperature fields were simulated by 3D finite volume method (3D-FVM) and volume of fluid (VOF) method. It is found that theoretically isotactic polypropylene (iPP) tends to form highly oriented superstructures when subjected a critical shear rate of about 1200 s−1 and a cooling rate of 12.5 °C⋅s−1 in the second penetration process of M3IM, while high density polyethylene (HDPE) shows some otherwise in critical conditions to form oriented morphologies in the penetrated layer, i.e., cooling rate of 10 °C⋅s−1 is inadequate for HDPE shish-kebab structures fabrication even though the shear rate surpasses 1200 s−1. This work constructs a bridge between coupled external fields analyzing which involves a multiphase interface and complicate crystal morphologies prediction under multiple melt flow in a facile way. Image 1 • Coupled external fields around the interface were simulated. • Hierarchically crystalline structures around the interface were examined. • Relationship between external fields and structural hierarchy were established. • Critical forming conditions of oriented superstructures were established. • Great significance for predicting possible crystal morphologies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Composites: Part B, Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.compositesb.2020.107770
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      – Code: eng
        Text: English
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        StartPage: N.PAG
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      – SubjectFull: Crystal structure
        Type: general
      – SubjectFull: High density polyethylene
        Type: general
      – SubjectFull: Finite volume method
        Type: general
      – SubjectFull: Crystal morphology
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      – SubjectFull: Crystal lattices
        Type: general
      – SubjectFull: Interface structures
        Type: general
      – SubjectFull: Phononic crystals
        Type: general
    Titles:
      – TitleFull: Formation mechanism of hierarchically crystalline structures under coupled external fields in multi-melt multi-injection molding: Simulation and experiment.
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            NameFull: Chen, Li-Bo
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            NameFull: Huang, Yan-Hao
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            – D: 01
              M: 05
              Text: May2020
              Type: published
              Y: 2020
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              Value: 188
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            – TitleFull: Composites: Part B, Engineering
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