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Effects of n-hexadecane on sphericity of poly-α-methylstyrene shells.

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Title: Effects of n-hexadecane on sphericity of poly-α-methylstyrene shells.
Authors: Chen, Qiang1,2, Liu, Meifang2, Pan, Dawei2, Chen, Sufen2, Shi, Ruiting2, Qi, Xiaobo2, Zhang, Zhanwen2, Li, Bo2 lb67_11@163.com
Source: Colloids & Surfaces A: Physicochemical & Engineering Aspects. Oct2018, Vol. 554, p1-8. 8p.
Subjects: Sphericity (Statistics), Alpha-methylstyrol, Inertial confinement fusion, Phase separation, Interfacial tension
Abstract: Millimeter-scale polymer shells with stringent specifications such as sphericity, wall thickness uniformity and surface finish are needed in inertial confinement fusion (ICF) experiment. In order to meet these stringent specifications, n -hexadecane (n-HD) is introduced in oil phase to improve the sphericity of poly-α-methylstyrene (PAMS) shells. The results show that n-HD decreases the survival rate of the final PAMS shells, since coalescence between W1/O/W2 double droplets occurs owing to phase separation during the curing process. However, characterization results show that the addition of n-HD into O phase leads an increasing interfacial tension at O-W2 interface, which is considered as the only driving force for sphericity. Tracking experiment data indicates that the addition of n-HD can effectively extend the curing process. A percolation threshold is determined at about 58% where PAMS large-scale networking occurs and over where the deformation of the droplets is considered irreversible. So the addition of n-HD can extend the period W1/O/W2 droplets stay in liquid with nice fluidity, where the interfacial tension can work sufficiently and thus improving the final sphericity of polymer shells. Furthermore, when the mass fraction of n-HD is larger than 2.0%, porous PAMS shells can be obtained. [ABSTRACT FROM AUTHOR]
Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects 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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DbLabel: Engineering Source
An: 130911049
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Effects of n-hexadecane on sphericity of poly-α-methylstyrene shells.
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Qiang%22">Chen, Qiang</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Meifang%22">Liu, Meifang</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pan%2C+Dawei%22">Pan, Dawei</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+Sufen%22">Chen, Sufen</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Shi%2C+Ruiting%22">Shi, Ruiting</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Qi%2C+Xiaobo%22">Qi, Xiaobo</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Zhanwen%22">Zhang, Zhanwen</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Bo%22">Li, Bo</searchLink><relatesTo>2</relatesTo><i> lb67_11@163.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Colloids+%26+Surfaces+A%3A+Physicochemical+%26+Engineering+Aspects%22">Colloids & Surfaces A: Physicochemical & Engineering Aspects</searchLink>. Oct2018, Vol. 554, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Sphericity+%28Statistics%29%22">Sphericity (Statistics)</searchLink><br /><searchLink fieldCode="DE" term="%22Alpha-methylstyrol%22">Alpha-methylstyrol</searchLink><br /><searchLink fieldCode="DE" term="%22Inertial+confinement+fusion%22">Inertial confinement fusion</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+separation%22">Phase separation</searchLink><br /><searchLink fieldCode="DE" term="%22Interfacial+tension%22">Interfacial tension</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Millimeter-scale polymer shells with stringent specifications such as sphericity, wall thickness uniformity and surface finish are needed in inertial confinement fusion (ICF) experiment. In order to meet these stringent specifications, n -hexadecane (n-HD) is introduced in oil phase to improve the sphericity of poly-α-methylstyrene (PAMS) shells. The results show that n-HD decreases the survival rate of the final PAMS shells, since coalescence between W1/O/W2 double droplets occurs owing to phase separation during the curing process. However, characterization results show that the addition of n-HD into O phase leads an increasing interfacial tension at O-W2 interface, which is considered as the only driving force for sphericity. Tracking experiment data indicates that the addition of n-HD can effectively extend the curing process. A percolation threshold is determined at about 58% where PAMS large-scale networking occurs and over where the deformation of the droplets is considered irreversible. So the addition of n-HD can extend the period W1/O/W2 droplets stay in liquid with nice fluidity, where the interfacial tension can work sufficiently and thus improving the final sphericity of polymer shells. Furthermore, when the mass fraction of n-HD is larger than 2.0%, porous PAMS shells can be obtained. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.colsurfa.2018.06.004
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      – Code: eng
        Text: English
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        PageCount: 8
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      – SubjectFull: Sphericity (Statistics)
        Type: general
      – SubjectFull: Alpha-methylstyrol
        Type: general
      – SubjectFull: Inertial confinement fusion
        Type: general
      – SubjectFull: Phase separation
        Type: general
      – SubjectFull: Interfacial tension
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    Titles:
      – TitleFull: Effects of n-hexadecane on sphericity of poly-α-methylstyrene shells.
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            NameFull: Chen, Qiang
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            NameFull: Liu, Meifang
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            NameFull: Pan, Dawei
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            NameFull: Chen, Sufen
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            NameFull: Shi, Ruiting
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            – D: 05
              M: 10
              Text: Oct2018
              Type: published
              Y: 2018
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              Value: 554
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