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Alignments and network of graphite fillers to improve thermal conductivity of epoxy-based composites.

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Title: Alignments and network of graphite fillers to improve thermal conductivity of epoxy-based composites.
Authors: Burger, N.1,2 nicolas.burger@list.lu, Laachachi, A.1, Mortazavi, B.3, Ferriol, M.2, Lutz, M.4, Toniazzo, V.1, Ruch, D.1
Source: International Journal of Heat & Mass Transfer. Oct2015, Vol. 89, p505-513. 9p.
Subjects: Graphite, Thermal conductivity, Epoxy resins, Filler materials, Nanocomposite materials
Abstract: Instead of improving the fillers dispersion in the matrix, some fillers alignments and structured composites were investigated in order to highlight their impact on thermal conductivity. Whereas well dispersed graphite-nanocomposites show some limit to reach high thermal conductivity values (0.84 W m −1 K −1 at 12 wt.%), 3D-structured composite or Z-pinning samples display much better enhancements of apparent thermal conductivity, reaching 2.1 W m −1 K −1 at 15 wt.%. Impact of insulating DGEBA interfaces was also investigated in this work. It was demonstrated that only two 4 μm-DGEBA layers cutting the fibers alignment is enough to bring thermal conductivity back to the value of the non-structured nanocomposite, losing all the positive impact of alignment. Mathematical evaluations helped estimating the through-plane thermal conductivities of the samples, highlighting the negative impact of interfaces, and displaying the major difference between a 3D-network sample and a Z-pinned aligned sample. Whereas the 3D-network sample displays a relatively good improvement of both in-plane and through-plane thermal conductivities, the Z-pinned sample presents a considerable increase of the through-plane thermal conductivity (until 6.8 W m −1 K −1 ), but also a negligible effect on the in-plane thermal conductivity. Resulting apparent thermal conductivities of both samples are finally quite comparable and more than doubled compared to non-structured nanocomposites. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science 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: 108455340
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PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Alignments and network of graphite fillers to improve thermal conductivity of epoxy-based composites.
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  Data: <searchLink fieldCode="AR" term="%22Burger%2C+N%2E%22">Burger, N.</searchLink><relatesTo>1,2</relatesTo><i> nicolas.burger@list.lu</i><br /><searchLink fieldCode="AR" term="%22Laachachi%2C+A%2E%22">Laachachi, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mortazavi%2C+B%2E%22">Mortazavi, B.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ferriol%2C+M%2E%22">Ferriol, M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lutz%2C+M%2E%22">Lutz, M.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Toniazzo%2C+V%2E%22">Toniazzo, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ruch%2C+D%2E%22">Ruch, D.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Heat+%26+Mass+Transfer%22">International Journal of Heat & Mass Transfer</searchLink>. Oct2015, Vol. 89, p505-513. 9p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Graphite%22">Graphite</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Epoxy+resins%22">Epoxy resins</searchLink><br /><searchLink fieldCode="DE" term="%22Filler+materials%22">Filler materials</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocomposite+materials%22">Nanocomposite materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Instead of improving the fillers dispersion in the matrix, some fillers alignments and structured composites were investigated in order to highlight their impact on thermal conductivity. Whereas well dispersed graphite-nanocomposites show some limit to reach high thermal conductivity values (0.84 W m −1 K −1 at 12 wt.%), 3D-structured composite or Z-pinning samples display much better enhancements of apparent thermal conductivity, reaching 2.1 W m −1 K −1 at 15 wt.%. Impact of insulating DGEBA interfaces was also investigated in this work. It was demonstrated that only two 4 μm-DGEBA layers cutting the fibers alignment is enough to bring thermal conductivity back to the value of the non-structured nanocomposite, losing all the positive impact of alignment. Mathematical evaluations helped estimating the through-plane thermal conductivities of the samples, highlighting the negative impact of interfaces, and displaying the major difference between a 3D-network sample and a Z-pinned aligned sample. Whereas the 3D-network sample displays a relatively good improvement of both in-plane and through-plane thermal conductivities, the Z-pinned sample presents a considerable increase of the through-plane thermal conductivity (until 6.8 W m −1 K −1 ), but also a negligible effect on the in-plane thermal conductivity. Resulting apparent thermal conductivities of both samples are finally quite comparable and more than doubled compared to non-structured nanocomposites. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science 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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        Value: 10.1016/j.ijheatmasstransfer.2015.05.065
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 505
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        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Epoxy resins
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      – SubjectFull: Filler materials
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      – SubjectFull: Nanocomposite materials
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              Text: Oct2015
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