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Poly(phenylene sulfide)-graphite composites for bipolar plates with preferred morphological orientation

Authors
  • Park, Ho-Joon1
  • Woo, Jong Seok2
  • Park, Soo-Young1
  • 1 Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Korea , Daegu (South Korea)
  • 2 Advanced Center of Engineering, 23, Dalseong2cha 4-ro, Guji-myeon, Dalseong-gun, Daegu, 43013, Korea , Daegu (South Korea)
Type
Published Article
Journal
Korean Journal of Chemical Engineering
Publisher
Springer-Verlag
Publication Date
Dec 04, 2019
Volume
36
Issue
12
Pages
2133–2142
Identifiers
DOI: 10.1007/s11814-019-0397-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

Bipolar plates in phosphoric acid fuel cells require inertness to phosphoric acid as well as excellent electrical, thermal, and mechanical properties. For this application, we prepared poly(phenylene sulfide) (PPS)-graphite composites with random or ordered graphite orientations by compression and extrusion-compression processes, respectively. Due to current limitations of extruding graphite-filled polymers, only moderately high graphite concentrations were used (up to 40 wt%). The compressed composites contained graphite sheets in a planar orientation (parallel to the pressing direction) and exhibited highly anisotropic electrical and thermal conductivity, with much higher in-plane than through-plane components. In contrast, composites that were extruded prior to compression exhibited randomly oriented graphite due to shearing forces during extrusion and therefore displayed isotropic properties. Thus, their through-plane electrical and thermal conductivity was superior to those of the ordered composite, while the in-plane properties were inferior. Notably, the internal graphitic structure affected the electrical conductivity more than the thermal conductivity. The randomly oriented composite also exhibited superior flexural strength, although the thermal stability of the two composites was almost equal. This study offers insights into the structure-property relationship of PPS-graphite composites as well as the effect of the orientation of conductive two-dimensional fillers on anisotropic properties.

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